United AirlinesUA87% on time
live
Direct flights from St Louis (STL) to Washington (IAD): 7 nonstop departures observed each week across 1 airline. 87% of the last 15 operated flights arrived within 15 minutes of schedule. The median arrival is 18 minutes early. No cancellations were recorded across the 15 tracked flights. The nonstop covers 1,118 km, an estimated 1 hour 56 minutes in the air. Measured by Pro Flight Search from live flight boards at St Louis and Washington. Updated 13 September 2026 at 15:18 UTC.
STL
St Louis
smooth · +11
IAD
Washington
smooth · +0
1,118 km · ~1h 56m est.
Runs reliable · 1 airline · 7x weekly · nonstop
87% on time
of the last 15 operated STL → IAD flights arrived within 15 minutes
Median arrival delay is −18 min. 0 of 15 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−18 minacross the last 15 operated legs
Flight time~1h 56mestimated from route distance
Weekly departures7x1 direct airline on the leg
Cancelled0.0%recent route rate · 0 of 15
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
United Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at STL: 39% odds of a 15+ minute delay and around +8 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the St Louis to Washington route actually runs
Pro Flight Search records official board updates for nonstop STL to IAD flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — St Louis (STL) to Washington (IAD) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/STL-IAD
STL to IAD questions
Is STL–IAD running on time right now?
Mostly on schedule. The departure side at STL is the weaker end, route health score 81/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on STL–IAD?
Operators schedule morning departures around 08:40 from STL. Earlier flights typically land before destination-airport delays accumulate later in the day; check the IAD delay card to confirm conditions when you'd arrive.
How long is the flight from STL to IAD?
Great-circle distance is 1,118 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 109–126 min gate-to-gate on this route.
How often does STL–IAD fly?
United Airlines runs the route with about 14 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
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