How thunderstorms affects
flights at DEN.
Denver International (DEN) in Denver. Historical delay data, cancellation risk, airline performance, and what to do when thunderstorms hits. Season: May - Sep.
Thunderstorms Impact at DEN
Based on historical flight performance data during May - Sep
74%
On-time rate
during thunderstorms
1.0%
Cancellation
rate
71m
Avg delay
when late
-7%
On-time rate drop
vs off-peak months
7 precip days/month
During
May - Sep
What happens at DEN during thunderstorms
Summer thunderstorms cause ground stops, lightning-related ramp closures, and air traffic control delays. Convective weather is the leading cause of FAA ground delay programs and affects hub airports across the South and Midwest.
Historical impact
During May - Sep, DEN's on-time rate drops to 74% — compared to 81% during non-peak months. That's a 7-point drop, making thunderstorms the most significant weather disruption at this airport. Cancellations rise from 1.2% to 1.0% during peak thunderstorms months.
Typical recovery time
1-3 hours after cells pass. Ground stops lift quickly, but cascading delays from rerouted aircraft can persist into the evening.
Which airlines handle thunderstorms best at DEN?
All airlines are subject to the same runway closures and ground stops, but some handle disruption better than others — faster rebooking, better crew scheduling, and more de-icing capacity.
Best at DEN
SkyWest Airlines
81% on-time · 73m avg delay
Most delayed
JetBlue Airways
69% on-time · 80m avg delay
Based on overall performance at DEN. Individual flight performance varies by route and time of day.
Tips for flying through DEN during thunderstorms
Fly before noon
Summer thunderstorms at DEN typically build in the afternoon. Morning flights have significantly better on-time rates during convective season.
Watch for ground stops on FAA.gov
The FAA posts ground delay programs in real time. If your departure airport has a GDP into your arrival airport, your flight will be delayed at the gate.
Don't panic at the gate
Thunderstorm delays are usually 1-3 hours. Unlike snow, once cells pass, operations resume quickly. Cancellations are rare unless storms persist past 8 PM.
Set up flight alerts
Gate changes and delay updates happen fast during convective weather. A free FlightCheck briefing tells you what to expect before you leave for the airport.
Get a free flight briefing for DEN
Weather risk, delay probability, and what to expect — delivered to your inbox before you fly.
Common questions
How does thunderstorms affect flights at DEN?
During thunderstorms season, DEN averages a 74% on-time rate with an average delay of 71 minutes when flights are late. The cancellation rate during peak months is 1.0%.
What months are worst for thunderstorms at DEN?
Thunderstorms at DEN peaks during May - Sep. These months show measurably higher delay and cancellation rates compared to the rest of the year.
Which airline handles thunderstorms best at DEN?
Based on historical data, SkyWest Airlines has the best on-time performance at DEN with a 81% on-time rate. However, all airlines are subject to the same runway and ground stop constraints during severe weather.
Do I get a refund if my DEN flight is cancelled due to thunderstorms?
Yes. Under federal law (14 CFR Part 260), you are entitled to a full cash refund if your flight is cancelled — regardless of the reason, including weather. The airline must refund to your original payment method within 7 business days for credit cards.
How long do thunderstorms delays last at DEN?
1-3 hours after cells pass. Ground stops lift quickly, but cascading delays from rerouted aircraft can persist into the evening.
Other airports affected by thunderstorms