Flights St. Louis → Denver
STL → DEN
Route overview
The flight route from St. Louis to Denver has a punctuality rate of 76%, with an average delay of 13.6 minutes per flight. Over the past year, this route has seen 853 flights operated by various aircraft including Airbus A320 and A319, Canadair Regional Jet 700, and Boeing 737-300, serving Denver International Airport, which opened in 1989 and handles over 82 million passengers annually.
Your rights on this US flight (DOT)
US flights have no statutory cash compensation for delays. Under the US DOT rules, if your flight is cancelled or significantly changed and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Amenities for controllable delays depend on each airline's contract of carriage.
US flight refund rules & checker →General information, not legal advice.
The St. Louis (STL) → Denver (DEN) route is operated by Frontier Airlines, United Airlines, Southwest Airlines. Across 1163 flights monitored in recent months, 77% arrived on time (within 15 min of schedule), with an average delay of 13 minutes. The cancellation rate is 1.12%. FlightGuard's average computed risk is 24.4/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Denver the average ATFM delay is 2.0 minutes (main cause: atfm). Departing from St. Louis the average ATFM delay is 2.0 minutes.
Heading to Denver: what to expect in this direction
Flying from St. Louis (STL) to Denver (DEN) heads west for about 1,236 km, a flight time of roughly 1h 58m.
Departures from St. Louis on this leg cluster in the morning window: about 35% of STL-DEN flights take off then.
Air-traffic congestion: departing St. Louis the average ATFM delay is 2.0 min (atfm); arriving into Denver it is 2.0 min (atfm).
Across 1,163 tracked STL-DEN flights, 77% left on time with an average delay of 13 min and a 1.1% cancellation rate.
Route facts
Flights on this route
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Airline punctuality on this route
| Airline | On-time | Average delay | Cancellations |
|---|---|---|---|
| United Airlines (UA) | 74% | 10 min | 6.9% |
| Frontier Airlines (F9) | 74% | 15 min | 2.2% |
| Southwest Airlines (WN) | 73% | 6 min | 3.1% |
Airlines operating STL-DEN
Airports
Frequently asked questions about STL-DEN
On the St. Louis (STL) -> Denver (DEN) route, on-time performance is 77% with an average delay of 13 minutes, based on 1163 tracked flights.
The cancellation rate on St. Louis-Denver is 1.12% across 1163 monitored flights.
The route is operated by 3 airlines: Frontier Airlines, United Airlines, Southwest Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at Denver, ATC delays, strikes, NOTAMs, fuel, airline punctuality and recent trends.
US flights have no statutory cash compensation for delays. Under US DOT rules, if the airline cancels or significantly changes your flight and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Meals or hotels for controllable delays depend on each airline's contract of carriage.
