IAD → STLWashington to St Louis

live

Direct flights from Washington (IAD) to St Louis (STL): 7 nonstop departures observed each week across 1 airline. 86% of the last 14 operated flights arrived within 15 minutes of schedule. The median arrival is 18 minutes early. No cancellations were recorded across the 14 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 Washington and St Louis. Updated 10 October 2026 at 05:37 UTC.

IAD Washington smooth · +11
STL St Louis heavy · +31
1,118 km · ~1h 56m est.
dep bank 08:20–17:557x weekly
Runs reliable · 1 airline · 7x weekly · nonstop
86% on time

of the last 14 operated IAD → STL flights arrived within 15 minutes

Median arrival delay is −18 min. 0 of 14 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−18 minacross the last 14 operated legs
Flight time~1h 56mestimated from route distance
Weekly departures7x1 direct airline on the leg
Cancelled0.0%recent route rate · 0 of 14

The week

scheduled departures · origin local time
06121824
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 days
United AirlinesUA92% on time

Flights UA4587 08:20 Mo Tu We Th Fr Su · UA4527 17:55 daily

History

operated legs · board outcomes
10-09UA4527dep +24 → arr−23
10-09UA4587dep +43 → arr+4
10-08UA4527dep +23 → arr−19
10-08UA4587dep +13 → arr−32
10-071I413dep +32 → arr+30
10-07UA4527dep +21 → arr−20
10-07UA4587dep +11 → arr−33
10-06UA4527dep +15 → arr−37
10-06UA4587dep +18 → arr−18
10-05UA4527dep +27 → arr−18
10-05UA4587dep +91 → arr+50
10-04UA4527dep +25 → arr−12
10-04UA4587dep +48 → arr+10
10-03UA4527dep +31 → arr−15

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
IADWashington +11 min smooth 🌤 mostly cloudy · N 0 kt Full IAD delay board →
STLSt Louis +31 min heavy 🌤 clear · SSE 9 kt Full STL delay board →

Weather lens

Current conditions put the pressure at STL: 39% odds of a 15+ minute delay and around +9 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the Washington to St Louis route actually runs

Pro Flight Search records official board updates for nonstop IAD to STL 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 — Washington (IAD) to St Louis (STL) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/IAD-STL
How we measure this →

IAD to STL questions

Is IAD–STL running on time right now?

Mostly on schedule. The arrival side at STL is the weaker end, route health score 71/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on IAD–STL?

Operators schedule morning departures around 08:20 and evening departures around 17:55 from IAD. Earlier flights typically land before destination-airport delays accumulate later in the day; check the STL delay card to confirm conditions when you'd arrive.

How long is the flight from IAD to STL?

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 IAD–STL fly?

United Airlines runs the route with about 13 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.