Chicago O’Hare and Others Face a Thanksgiving Airport Reliability Test as Winter Weather Threatens Millions of US Holiday Journeys

Illinois, Colorado, Minnesota and Michigan are approaching a crucial Thanksgiving aviation period, as winter conditions could complicate holiday journeys across four major US airport markets. Chicago O’Hare, Denver International, Minneapolis–Saint Paul and Detroit Metropolitan will face the combined pressures of concentrated passenger demand, aircraft turnaround requirements and seasonal weather exposure. Historical climate records reveal distinct snowfall and temperature patterns, while 2025 passenger statistics highlight the enormous traffic handled by these gateways. The FAA’s 2025 Thanksgiving preparations anticipated more than 360,000 flights nationally, establishing the scale of the seasonal challenge. With Thanksgiving falling on 26 November 2026, travellers face important decisions about connections, departure times and disruption protection.

Four Aviation Gateways Enter the Holiday Reliability Test

The Thanksgiving travel period creates an unusually demanding operating environment for American airports. Millions of passengers concentrate their journeys around a narrow calendar window, increasing pressure on airline schedules, airport facilities and air traffic management. Consequently, even a local weather disturbance can create operational consequences extending well beyond the affected state.

The four airports examined in this report occupy particularly important positions within the national aviation network. Chicago O’Hare connects domestic and international markets, while Denver serves as a major western interchange. Minneapolis–Saint Paul provides extensive Upper Midwest connectivity, and Detroit links Michigan with major domestic and international destinations.

Their challenges, however, are not identical. Winter weather exposure, passenger throughput, runway availability and connecting-flight dependence create different operational vulnerabilities. Therefore, snowfall alone cannot determine which airport will deliver the most dependable holiday experience.

Thanksgiving 2026 falls on Thursday, 26 November. The principal departure surge is expected around Tuesday and Wednesday, followed by another substantial movement of passengers after the holiday weekend. The comparable seven-day reporting window runs from Tuesday, 24 November, through Monday, 30 November.

The FAA has not yet published its equivalent 2026 Thanksgiving traffic forecast. Its previous-year preparations nevertheless provide useful context for the approaching season.

Passenger Volumes Raise the Operational Stakes

The scale of airport activity makes this comparison particularly significant. Chicago, Denver, Minneapolis and Detroit collectively serve enormous passenger markets, supporting tourism, business travel and regional economic activity.

Their latest published annual statistics reveal substantial differences in throughput.

Airport	2025 passenger traffic	Important operational detail
Chicago O’Hare (ORD)	84.86 million	857,392 aircraft operations
Denver International (DEN)	82.43 million	Record annual passenger traffic
Minneapolis–Saint Paul (MSP)	36.07 million	3.61 million international passengers
Detroit Metropolitan (DTW)	More than 33 million	More than 800 daily flights

Figures represent airport-reported passenger traffic. Aircraft operations and passenger totals are different measurements and should not be treated as equivalent.

Chicago O’Hare recorded 84,856,018 passengers during 2025, alongside 857,392 aircraft operations. Its aircraft movements increased 10.49% year-on-year, demonstrating the scale of its expanding operational activity.

Denver International handled 82,427,962 passengers, establishing another annual traffic record. Meanwhile, Minneapolis–Saint Paul processed 36,071,627 passengers, despite a roughly 3% decline from 2024. Detroit Metropolitan welcomed more than 33 million passengers during 2025.

These figures demonstrate why relatively small operational disturbances can affect substantial passenger populations. However, passenger throughput alone does not establish an airport’s reliability ranking.

Chicago O’Hare Faces a High-Volume Connectivity Challenge

ILLINOIS | ORD

Chicago O’Hare represents one of the most important components of the Thanksgiving aviation comparison. Its extensive domestic and international network creates considerable connectivity, but also exposes passengers to the consequences of operational interruptions.

The airport recorded more than 860,000 take-offs and landings in 2025, according to Chicago aviation authorities. It also serves more than 280 nonstop destinations through over 50 airlines, supported by eight commercial runways.

Its latest annual traffic figures reveal another important development. O’Hare handled nearly 84.86 million passengers during 2025, representing approximately 5.97% growth compared with 2024. Aircraft operations also increased by approximately 10.49%.

This expansion matters during Thanksgiving because greater flight activity increases the number of aircraft movements that airport operators must coordinate. Snow accumulation, freezing precipitation and reduced visibility can complicate runway management, aircraft positioning and departure sequencing.

Chicago’s November climate normals provide useful historical context. The 1991–2020 records show an average temperature of 41.3°F, alongside approximately 1.8 inches of monthly snowfall. Average November precipitation reaches 2.42 inches.

These figures do not suggest continuous winter conditions throughout November. Nevertheless, temperatures regularly approach freezing, particularly overnight, creating opportunities for icy surfaces and precipitation-related operational complications.

O’Hare’s eight-runway configuration provides substantial infrastructure. However, multiple runways do not eliminate the consequences of poor visibility, crosswinds or runway treatment requirements. Air traffic controllers must maintain safe separation while airport teams manage snow removal and aircraft ground movements.

The airport is also advancing its ORDNext development programme. Its new Concourse D is scheduled to open in 2028 with 19 gates, while the first phase of Concourse E is planned to introduce another 14 gates in 2030.

Although these developments will strengthen future capacity, they will not directly resolve every operational challenge during Thanksgiving 2026. Travellers should therefore consider both flight availability and connection timing when choosing O’Hare itineraries.

Denver Tests Winter Operations at Extraordinary Scale

COLORADO | DEN

Denver International presents a different aviation challenge because of its location and seasonal weather exposure. Its high passenger throughput, extensive flight network and winter operating environment make it an important case study.

The airport handled 82.43 million passengers in 2025, becoming busier than the previous year for the fifth consecutive annual comparison? No such consecutive record is established here; its confirmed milestone was a new annual passenger record, up 0.1% from 2024.

Denver’s November climate normals show an average temperature of 39.4°F. Historical November snowfall averages approximately 7.3 inches, based on the 1991–2020 Stapleton record. This is considerably higher than the November average recorded in Chicago.

However, Denver’s airport-specific snowfall record requires careful interpretation. The National Weather Service began official snowfall observations at Denver International in the 2007–2008 snow season. Its published seasonal normal is approximately 47 inches, based on an estimated 30-year benchmark.

Denver therefore faces a different pattern of winter exposure. Snowfall, strong winds and rapidly changing temperatures can combine to affect aircraft movements and ground operations. The airport’s elevation and surrounding regional geography also make changing weather conditions important to operational planning.

The distinction between snowfall and disruption remains essential. A snow event does not automatically produce extensive cancellations if airport teams maintain effective clearance procedures. Conversely, relatively modest precipitation can cause complications when freezing conditions, wind and poor visibility coincide.

Denver’s enormous passenger base adds another dimension. The airport recorded more than eight million passengers during July 2025, demonstrating its capacity to accommodate exceptionally concentrated travel demand.

Its longer-term ambition to serve 100 million annual passengers also makes infrastructure development important. Nevertheless, the Thanksgiving comparison must focus on current operational performance rather than future capacity promises.

For passengers, Denver’s connecting-flight arrangements deserve particular attention. Travellers moving between western destinations and eastern markets should consider the possibility of weather-related delays affecting subsequent departures.

Minneapolis Relies on Winter Experience and Operational Readiness

MINNESOTA | MSP

Minneapolis–Saint Paul International Airport offers an interesting contrast within this four-state investigation. Its location exposes the airport to substantial winter conditions, yet its established operating environment makes winter preparedness an important measure of performance.

MSP processed 36,071,627 passengers in 2025, compared with 37,168,451 during 2024. Despite the decline in total traffic, international passenger demand continued expanding. The airport handled approximately 3.61 million international passengers, representing around 10% of its annual passenger volume.

It also recorded a new international network milestone, serving 35 international destinations during 2025. Delta Air Lines expanded this network through services connecting Minneapolis with Copenhagen and Rome.

These developments matter because international connectivity increases the importance of dependable connecting operations. A disruption affecting a domestic feeder flight can potentially affect passengers travelling onwards to European destinations.

Minnesota’s winter exposure makes MSP particularly relevant to the Thanksgiving comparison. The National Weather Service identifies 4 November as the average date for the Twin Cities’ first measurable snowfall. However, actual snowfall varies considerably between seasons.

The airport’s operational preparation deserves close examination. Snow removal, runway inspections, aircraft de-icing and coordinated ground services become essential when temperatures fall and precipitation develops.

Winter experience should not automatically be interpreted as superior reliability. An airport may possess extensive snow-management experience while still experiencing significant delays during exceptional weather events. The meaningful comparison must examine actual departure and arrival performance.

MSP also illustrates why passenger numbers cannot independently determine operational vulnerability. Its annual throughput remains below Chicago and Denver, but its international connections and regional importance make disruption consequences significant.

For travellers, the airport’s network structure deserves attention. Passengers connecting through Minneapolis should consider their onward departure times, particularly when travelling internationally or using separate tickets.

Detroit Encounters the Great Lakes Weather Variable

MICHIGAN | DTW

Detroit Metropolitan Wayne County Airport completes the four-airport comparison with a different regional weather profile. Its Great Lakes location makes changing temperatures, precipitation and winter conditions important considerations during late November.

The airport welcomed more than 33 million passengers during 2025. Its network includes approximately 800 daily flights connecting passengers with more than 125 nonstop destinations across three continents.

Detroit’s November climate normals indicate an average temperature of approximately 41.2°F, with average monthly precipitation of 2.57 inches. The National Weather Service records average November snowfall of approximately 1.9 inches.

These figures place Detroit close to Chicago in terms of average November snowfall. However, monthly averages conceal substantial variations between individual weather events.

The Great Lakes region can experience changing precipitation patterns, including rain, snow and freezing conditions. Temperature fluctuations can complicate surface treatment and aircraft turnaround requirements, particularly when precipitation coincides with freezing temperatures.

Detroit’s infrastructure provides important operational advantages. Its six runways and two passenger terminals support a substantial domestic and international network.

Nevertheless, a six-runway configuration cannot eliminate disruption when adverse weather affects visibility, runway conditions or wider airspace operations. Aircraft arrivals, departures and connecting services still depend on coordinated airport and airline operations.

Detroit also has a significant economic role within Michigan. The Wayne County Airport Authority estimates that its airport operations support more than 86,000 jobs throughout the state. Consequently, prolonged disruption can affect business travel, tourism and wider regional mobility.

For Thanksgiving passengers, the key consideration is the combination of weather conditions and connection timing. A delayed arrival can create additional problems for passengers transferring between domestic and international services.

Four States Reveal Different Winter Exposure Patterns

The comparison becomes more meaningful when historical climate information is examined alongside airport traffic. These measurements establish seasonal exposure, although they cannot independently predict operational disruption.

Airport	November mean temperature	Average November snowfall	Historical climate period
Chicago O’Hare	41.3°F	1.8 inches	1991–2020
Denver	39.4°F	7.3 inches	1991–2020 Stapleton record
Minneapolis–Saint Paul	Not established in this comparison	Not established in this comparison	Requires airport-specific normal series
Detroit	41.2°F	1.9 inches	1991–2020

Temperature and snowfall figures are historical climate averages, not forecasts for Thanksgiving 2026. Denver’s snowfall figure uses the historical Stapleton observation series.

Denver stands out in this comparison because its historical November snowfall average is substantially higher. Chicago and Detroit, meanwhile, demonstrate that relatively modest monthly snowfall averages do not eliminate freezing-weather exposure.

Minneapolis requires particular care. Its winter conditions should be evaluated using airport-specific climate observations rather than assigning Twin Cities snowfall figures without confirming the measurement station and reporting period.

This distinction is important for research credibility. An accurate comparison should never substitute regional climate estimates for airport-specific operational evidence.

Flight Delays Can Travel Beyond the Weather System

The most important passenger issue extends beyond the airport experiencing the initial weather disturbance. Modern airline networks operate through interconnected aircraft rotations, crew schedules and connecting passenger itineraries.

Consider an aircraft scheduled to arrive in Chicago before continuing to another destination. If poor weather delays its arrival, the airline may struggle to maintain the aircraft’s subsequent departure schedule.

The same problem can affect crew availability. Flight crews operate under regulated duty-time limitations, meaning substantial delays can require operational adjustments. Airlines may need replacement crews, aircraft substitutions or revised schedules.

Connecting passengers face an additional layer of vulnerability. Someone travelling through Denver or Minneapolis may miss an onward flight even when the destination airport has favourable weather.

This explains why a disruption originating in one state can affect journeys across the country. A delayed flight can create missed connections, additional accommodation expenses and longer waiting periods.

The consequences become particularly significant during Thanksgiving. Alternative flights may have limited available seats, especially when demand concentrates around the same departure dates.

Passengers holding separate tickets face additional complications. Unlike protected connections within a single airline itinerary, independently booked journeys may not receive the same rebooking assistance.

Consequently, the most useful reliability assessment should examine both airport-level punctuality and network-level passenger exposure.

FAA Traffic Planning Sets the National Benchmark

The Federal Aviation Administration’s 2025 Thanksgiving preparations provide a useful reference for understanding holiday aviation pressure. The agency anticipated more than 360,000 flights during the holiday travel period, describing it as the busiest Thanksgiving season in 15 years.

Tuesday, 25 November 2025, was expected to become the busiest day, with more than 52,000 flights. The agency also highlighted air traffic controllers’ role in coordinating safe operations during exceptionally concentrated demand.

These figures are historical planning estimates, not actual completed flight totals. They nevertheless demonstrate the scale of operational coordination required during the holiday season.

For 2026, the comparable planning announcement should be monitored as the holiday approaches. Until then, travellers should not interpret last year’s traffic forecast as a confirmed projection for this year’s aviation market.

Winter operations also involve several technical procedures. Aircraft de-icing removes accumulated ice and snow from aircraft surfaces, while anti-icing procedures help prevent further accumulation for a limited period.

Runway maintenance follows separate safety requirements. Airport teams clear snow, monitor surface conditions and assess braking-related information before aircraft movements continue.

The FAA and airport authorities coordinate operational decisions through established aviation procedures. Airlines also adjust departure schedules and aircraft positioning when weather conditions affect available capacity.

An important distinction exists between weather-related delays and weather-related cancellations. Some flights experience longer turnaround periods but eventually operate. Others may be cancelled when operating conditions, aircraft availability or wider network constraints make departure impractical.

The Department of Transportation’s consumer protection framework also matters. Airlines must follow applicable refund requirements when they cancel or significantly change flights. However, weather-related disruption does not automatically entitle passengers to additional compensation.

Historical Performance Must Determine the Reliability Ranking

A genuine comparison requires more than weather statistics and passenger volumes. The Bureau of Transportation Statistics maintains historical airline performance records covering on-time arrivals, cancellations, diversions and different categories of delay.

Its TranStats database contains airline on-time performance data dating back to January 1995. The currently published dataset extends through August 2026, providing a useful foundation for examining the four airports before Thanksgiving.

However, a definitive 2026 holiday reliability ranking cannot yet exist. Thanksgiving 2026 operations have not taken place, and historical percentages must use identical reporting periods and definitions.

The following comparison framework identifies the most important measurements.

Performance indicator	What travellers should understand
On-time arrivals	Percentage of flights arriving within the recognised punctuality threshold
Departure delays	Flights departing later than scheduled
Cancellation rate	Proportion of scheduled flights cancelled
Average delay minutes	Typical additional waiting time
Weather-related delays	Disruptions attributed to weather conditions
Diverted flights	Aircraft redirected from their scheduled destinations

The BTS generally defines an on-time arrival as an aircraft reaching its gate less than 15 minutes after scheduled arrival. This provides a consistent basis for evaluating airline punctuality.

A further distinction involves the cause of disruption. A flight departing late from Chicago might reflect weather affecting its incoming aircraft elsewhere. Therefore, airport-level delay figures should not automatically be interpreted as evidence of poor local weather management.

For this investigation, the most meaningful historical comparison would cover Thanksgiving-relative dates across 2023, 2024 and 2025. It should also compare those results against ordinary November operations.

A proposed editorial reliability index could allocate 30% to historical holiday punctuality, 20% to weather exposure, 20% to operational resilience, 20% to connecting-flight vulnerability and 10% to passenger traffic pressure. This would be an independently developed comparison, not an official government ranking.

What Thanksgiving Passengers Should Consider

Travellers using these four airports should prioritise itinerary protection rather than relying exclusively on weather forecasts.

A nonstop journey generally removes the risk of missing an intermediate connection. However, passengers travelling through major hubs should consider longer transfer windows during periods of elevated winter-weather exposure.

The following precautions offer practical value:

• Choose protected connections: Book connecting flights under one reservation wherever possible.
• Avoid excessively tight transfers: Allow additional time when connecting through winter-exposed airports.
• Consider earlier departures: Earlier flights can leave more alternative services available if disruption occurs later.
• Monitor airline notifications: Check schedule changes and departure information before leaving for the airport.
• Understand refund rights: Review applicable US Department of Transportation protections when airlines cancel or significantly change itineraries.
• Prepare for extended waits: Keep essential medication, chargers and important travel documents accessible.

Passengers should also examine their airline’s rebooking policies before departure. Weather-related disruption can create substantial inconvenience, particularly when replacement seats become limited during holiday peaks.

The Final Reliability Test Will Depend on Execution

Illinois, Colorado, Minnesota and Michigan present four different versions of the same Thanksgiving aviation challenge. Chicago and Denver demonstrate the enormous scale of major connecting hubs, while Minneapolis and Detroit offer important insights into Upper Midwest winter operations.

Historical climate records identify genuine seasonal exposure, but they cannot establish which airport will experience the greatest disruption on 26 November. Similarly, passenger traffic indicates operational scale rather than reliability.

The decisive measure will be how effectively airports, airlines and air traffic controllers manage demand when winter conditions interfere with normal schedules. Travellers should therefore evaluate connection arrangements, historical punctuality and airline flexibility before choosing their holiday itineraries.

Thanksgiving 2026 offers an important opportunity to examine whether established winter-management capabilities translate into dependable passenger journeys. The most reliable airport will ultimately be the one that maintains the strongest operational performance, not necessarily the one experiencing the least snowfall.