Flights cancelled most often in winter and during storms
Winter months—December through February—see the highest cancellation rates across most U.S. airlines. Snow, ice, and freezing rain ground planes or force airlines to reduce schedules. The Northeast and Midwest experience the worst conditions, but winter weather affects every region. Spring and fall have lower cancellation rates, and summer is generally the safest season, though thunderstorms in the afternoon can still cause disruptions.
Severe weather is the single largest cause of cancellations. Thunderstorms with high winds, heavy snow, and fog all force airlines to pause operations until conditions improve. Tropical storms and hurricanes can shut down entire airports for days. If you are flying during a weather event, your flight is at real risk—not just delay, but cancellation.
Key Takeaways
- Winter flights, especially in the Northeast and Midwest, cancel at rates two to three times higher than summer flights.
- Afternoon thunderstorms in summer and spring cause more cancellations than morning departures on the same routes.
- Flights on regional carriers (smaller airlines operating short routes) cancel more often than major carriers on the same airports.
- Early morning flights before 7 a.m. have lower cancellation rates because weather problems have not yet developed.
- Connecting flights cancel more often than direct flights because a problem at either airport can trigger the cancellation.
Early morning departures versus afternoon and evening flights
The time of day matters. Early morning flights—those departing before 7 a.m.—have the lowest cancellation rates because weather has not yet developed and the airline's equipment is fresh from overnight maintenance. Afternoon flights between 2 p.m. and 6 p.m. see higher cancellation rates, especially in spring and summer when thunderstorms build during the day. Evening flights after 7 p.m. also cancel more often because delays from earlier in the day cascade forward.
If you are booking a flight during a season with uncertain weather, a morning departure reduces your risk. You pay the inconvenience of an early start, but you gain a real advantage in cancellation likelihood. This is especially true for routes where afternoon thunderstorms are common—the Southeast, Midwest, and Great Plains.
Direct flights versus connecting flights
A direct flight has one point of failure: the weather or conditions at your departure airport or arrival airport. A connecting flight has three: your departure airport, your connection airport, and your final destination. If weather closes any of those three places, your flight cancels. The more connections, the higher the risk.
A flight from Boston to Los Angeles direct is less likely to cancel than a flight from Boston to Denver to Los Angeles. The connecting flight depends on Denver's weather staying clear, and Denver's afternoon thunderstorms are frequent in summer. If you have a choice between a direct flight and a one-stop connection on the same day, the direct flight is statistically safer.
Regional carriers and smaller airlines
Regional carriers—airlines operating smaller planes on shorter routes, often under contract to major carriers—cancel at higher rates than major carriers. Airlines like SkyWest, Republic Airways, and Endeavor Air operate regional jets that are more affected by weather and have less flexibility in scheduling. A flight operated by a regional carrier on a route also served by a major carrier will likely have a higher cancellation rate.
This matters most on routes with multiple options. If you are flying from a major hub to a smaller city, you may have a choice between a regional carrier's direct flight and a major carrier's connecting flight. The direct flight cancels more often, but the connecting flight has two airports where problems can occur. Check the airline operating your flight before you book—the carrier name appears in your confirmation.
Routes with weather challenges year-round
Some routes cancel more often than others because of geography. Denver, San Francisco, and Seattle have frequent fog and wind that disrupt flights even outside winter. The Northeast corridor (Boston, New York, Philadelphia, Washington) experiences ice storms and nor'easters. Florida routes cancel during hurricane season (June through November). The Southwest has dust storms in spring.
If you are flying a route known for weather problems, expect higher cancellation rates no matter the season. A flight from San Francisco to Los Angeles cancels more often than a flight from Chicago to Dallas, even in summer. Check historical weather patterns for your specific route before you book, especially if your travel is time-sensitive.
Mechanical issues and crew scheduling
Weather causes most cancellations, but mechanical problems and crew scheduling also ground flights. A plane that breaks down during a previous flight may not be ready for your departure. A crew that is delayed or stuck at another airport can force cancellation. These cancellations happen year-round and are harder to predict than weather.
Mechanical cancellations happen more often on older aircraft and on routes where planes fly multiple legs per day. A plane flying six segments in one day has more opportunity for a problem to occur. Crew scheduling cancellations spike during holidays when crew members call in sick or when weather delays earlier flights. If you are traveling during a holiday period, expect higher cancellation risk from crew issues even if weather is clear.
How to check cancellation rates before you book
The U.S. Department of Transportation publishes monthly reports on airline cancellation rates by carrier, but these are averages across all routes and seasons. FlightAware and other flight-tracking sites show historical on-time performance for specific routes and times of day. Search for your exact flight (same departure airport, arrival airport, and time) on FlightAware and look at the last 30 days of data. If a flight has cancelled three times in the last month, it is a higher-risk booking.
Your airline's website also shows historical performance. Most major carriers publish on-time statistics by route. Call the airline directly if you are booking a flight during a high-risk season—ask them what the cancellation rate has been for that specific flight in the past three months. They will tell you honestly because they want you to understand the risk.
What to do if your flight is cancelled
If your flight cancels, the airline must rebook you on the next available flight to your destination at no extra cost, even if it is on a competing airline. You are not may have access to to a refund unless you choose not to fly. If the cancellation is due to weather, the airline is not required to pay for meals or hotels, but many do as a courtesy. If the cancellation is due to a mechanical problem or crew issue, some airlines will pay for accommodations.
The moment you hear your flight is cancelled, go to the airline counter or call the airline directly—do not wait in line with other passengers. The airline will rebook you when ready, and the first people rebooked get the best options. If you are rebooked on a flight that departs hours later, ask whether the airline will pay for a meal or hotel. Some will, some will not, but asking costs nothing.
Frequently Asked Questions
Are flights cancelled more often on certain days of the week?
Friday and Sunday see slightly higher cancellation rates because passenger volume is highest and weather problems affect more people. Monday through Thursday have marginally lower rates. The difference is small—usually less than 1 percent—so day of week is less important than season, time of day, and route.
Do budget airlines cancel more often than full-service airlines?
Budget carriers like Southwest and Spirit operate with tighter schedules and smaller margins, so they sometimes cancel rather than delay. Full-service carriers like United and American have more flexibility to absorb delays. The difference is not dramatic, but budget airlines do cancel slightly more often on the same routes.
Can I get a refund if my flight is cancelled due to weather?
No. Weather is considered an act of God, and airlines are not required to refund tickets when weather causes cancellation. You can rebook on another flight at no cost, or you can request a refund of your ticket price. Most passengers rebook because refunds take weeks to process.
What time of year should I avoid flying if I want the lowest cancellation risk?
June, July, and August have the lowest cancellation rates across most of the country. May and September are also relatively safe. Avoid December through February if your travel is time-sensitive. Spring (March and April) is unpredictable because severe weather is common.
Does booking a nonstop flight really reduce my cancellation risk?
Yes, but only slightly. A nonstop flight depends on two airports staying open instead of three, so the math favors it. The difference is usually 2 to 4 percent lower cancellation rate. If both airports are in regions with frequent weather problems, the advantage shrinks.