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STL to IAD: distance & flight time
St. Louis (St Louis Lambert International Airport) → Washington (Washington Dulles International Airport)
694 mi
1,118 km · 603 nm
1h 59m
estimated nonstop flight time
+1h
time difference · heading east
See live STL→IAD fares Phone-only fares on this route — call free
Flight time details
694 miles nonstop takes roughly 1h 59m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time gain when reading arrival times on your ticket.
The two airports
- STL — St Louis Lambert International Airport · St. Louis, United States
- IAD — Washington Dulles International Airport · Washington, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near STL
- SUS · Spirit of St Louis Airport16 mi away
- ALN · St Louis Regional Airport20 mi away
- BLV · Scott AFB/Midamerica Airport32 mi away
- SPI · Abraham Lincoln Capital Airport84 mi away
Frequently asked questions
How far is STL from IAD?
The flight distance from St. Louis (STL) to Washington (IAD) is 694 miles (1,118 km, 603 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from STL to IAD?
A nonstop flight takes about 1h 59m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from STL to IAD?
Nonstop service on STL–IAD depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 1h 59m nonstop estimate.
What is the time difference between St. Louis and Washington?
Washington is 1 hour ahead of St. Louis.
What is the cheapest way to fly from STL to IAD?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on STL–IAD that never appear on search engines, with no booking fees.
Why are some STL to IAD fares phone-only?
Consolidator contracts let us sell certain STL–IAD tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.