Flights St. Louis → Washington
STL → IAD
How long is the flight from St. Louis to Washington?
The flight from St. Louis (STL) to Washington (IAD) takes 1h 34m on average. That is the median time recorded across 1 scheduled flight on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
Route overview
The flight route from St. Louis to Washington has a 72% on-time performance rate, with an average delay of 22.5 minutes when flights are not on time. Over the course of a year, this route sees around 178 total flights using aircraft such as the Embraer RJ145, Canadair Regional Jet 700, and Embraer 170, serving a destination airport that handles approximately 21,376,896 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) → Washington (IAD) route is operated by United Airlines. Across 439 flights monitored in recent months, 80% arrived on time (within 15 min of schedule), with an average delay of 19 minutes. The cancellation rate is 0.68%. FlightGuard's average computed risk is 21.4/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At Washington the average ATFM delay is 5.5 minutes (main cause: atfm). Departing from St. Louis the average ATFM delay is 5.5 minutes.
Heading to Washington: what to expect in this direction
Flying from St. Louis (STL) to Washington (IAD) heads east for about 1,118 km, a flight time of roughly 1h 34m.
Departures from St. Louis on this leg cluster in the morning window: about 52% of STL-IAD flights take off then.
Air-traffic congestion: departing St. Louis the average ATFM delay is 5.5 min (atfm); arriving into Washington it is 5.5 min (atfm).
Across 439 tracked STL-IAD flights, 80% left on time with an average delay of 19 min and a 0.7% 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) | 83% | 5 min | 1.3% |
Airlines operating STL-IAD
Airports
Frequently asked questions about STL-IAD
The flight from St. Louis (STL) to Washington (IAD) takes 1h 34m on average. That is the median time recorded across 1 scheduled flight on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
On the St. Louis (STL) -> Washington (IAD) route, on-time performance is 80% with an average delay of 19 minutes, based on 439 tracked flights.
The cancellation rate on St. Louis-Washington is 0.68% across 439 monitored flights.
The route is operated by 1 airline: United Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at Washington, 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.
