Washington to St. Louis (IAD-STL): nonstop flights and who flies them

United Airlines flies nonstop between Washington (IAD) and St. Louis (STL), roughly 14 times a week. In the timetable below it flies as UA 4427, UA 4527, and UA 4587, scheduled at 2h 21m to 2h 32m for the 695 miles.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

Updated .

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14
Flights a week, 4-week average
2h 21m to 2h 32m
Scheduled flight time
695 mi
Nonstop distance
Free
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Washington to St. Louis flight schedule

Scheduled nonstop departures for IAD to STL starting October 22, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Washington (IAD) to St. Louis (STL)
Date Flight Airline Departs IAD Arrives STL Duration Aircraft
UA 4587United Airlines08:2009:412h 21mCR5
UA 4527United Airlines17:5519:212h 26mCR5
UA 4587United Airlines08:2009:412h 21mCR5
UA 4527United Airlines17:5519:212h 26mCR5
UA 4527United Airlines17:5519:212h 26mCR5
UA 4427United Airlines08:4010:122h 32mCR5
UA 4527United Airlines17:5519:212h 26mCR5
UA 4427United Airlines08:4010:122h 32mCR5
UA 4527United Airlines17:5519:212h 26mCR5
UA 4427United Airlines08:4010:122h 32mCR5
UA 4527United Airlines17:5519:212h 26mCR5
UA 4427United Airlines08:4010:122h 32mCR5
UA 4527United Airlines17:5519:212h 26mCR5

Showing all 13 scheduled IAD to STL departures across 7 days with service, starting October 22, 2026. Later dates are on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure.

See every IAD to STL date on the interactive map

Aircraft on the Washington to St. Louis nonstop

United Airlines flies the Bombardier CRJ on every departure in the schedule table on this page.

The full IAD to STL nonstop schedule

This page carries the full IAD to STL nonstop schedule, who operates each departure and how often it runs; the reverse direction is linked below.

See the schedule

Who operates each IAD to STL nonstop and how often it runs, from 2LNR's schedule data.

Plan on the map

See IAD to STL on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Washington to St. Louis nonstop

Carriers operating IAD to STL nonstop in the current schedule.

See IAD to STL on the interactive map →

Frequently asked questions about IAD to STL

How long is the flight from Washington (IAD) to St. Louis (STL)?
Scheduled flight times from Washington (IAD) to St. Louis (STL) run from 2h 21m to 2h 32m across the departures in the schedule table on this page. The nonstop covers about 695 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book.
Which airlines fly nonstop from IAD to STL?
United Airlines is currently the only airline flying IAD to STL nonstop. 2LNR doesn't show award or upgrade space for it on IAD to STL, so this page carries the schedule rather than a space claim.
How many flights a week are there from IAD to STL?
About 14 nonstop flights a week run between Washington (IAD) and St. Louis (STL) in the current schedule, operated by United Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.
What time do flights from IAD to STL depart?
Scheduled IAD to STL nonstops in the next 7 days with service leave between 08:20 and 17:55, local time at Washington. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
Which flights operate IAD to STL nonstop?
In the schedule table on this page, IAD to STL nonstops fly as UA 4427, UA 4527, and UA 4587 on United Airlines. The table lists each departure by date with its times and aircraft.
Does 2LNR show upgrade or award space on IAD to STL?
Not on this route: 2LNR doesn't show award or upgrade space for United Airlines on IAD to STL. The page carries the full IAD to STL nonstop schedule and who flies each departure, and the reverse direction is linked below.

See the full IAD to STL nonstop schedule

Every scheduled departure on this route, with who flies it. 2LNR shows upgrade and award space by date on the carriers it tracks, the next 14 days free on every product and the full horizon on Pro.

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