Cheap flights from Washington, D.C. Dulles Intl Airport to St. Louis from $51
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to St. Louis departing on 12/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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United Airlines flights from Washington, D.C. Dulles Intl Airport to St. Louis
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Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Mon 11/9
7:32 am-11:16 pm
2 stops16h 44m
Lambert-St Louis
Mon 11/16
4:26 pm-11:43 pm
2 stops30h 17m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Tue 12/1
10:33 pm-12:12 am
2 stops26h 39m
Lambert-St Louis
Thu 12/3
6:13 pm-5:45 pm
2 stops22h 32m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Wed 10/28
8:23 am-12:10 pm
1 stop4h 47m
Lambert-St Louis
Thu 10/29
1:00 pm-4:09 pm
Nonstop2h 09m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Thu 10/29
6:11 am-10:32 am
1 stop5h 21m
Lambert-St Louis
Mon 11/2
8:00 am-11:10 am
Nonstop2h 10m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Tue 11/10
1:15 pm-7:23 pm
1 stop7h 08m
Lambert-St Louis
Tue 11/17
1:00 pm-4:09 pm
Nonstop2h 09m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Thu 11/12
7:32 am-11:16 pm
2 stops16h 44m
Lambert-St Louis
Mon 11/16
4:26 pm-11:43 pm
2 stops30h 17m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Tue 10/27
5:13 pm-8:51 pm
1 stop4h 38m
Lambert-St Louis
Sat 10/31
10:47 am-5:10 pm
1 stop5h 23m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Thu 10/29
10:57 am-1:53 pm
1 stop3h 56m
Lambert-St Louis
Mon 11/2
10:35 am-4:28 pm
1 stop4h 53m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Tue 12/1
6:00 am-12:14 pm
1 stop7h 14m
Lambert-St Louis
Thu 12/3
6:47 am-12:39 pm
1 stop4h 52m
Washington, D.C.St. Louis
IAD Washington, D.C. Dulles Intl - STL Lambert-St Louis
IADSTL
Washington, D.C. Dulles Intl
Mon 1/18
7:05 am-1:30 pm
1 stop7h 25m
Lambert-St Louis
Fri 1/22
8:13 am-3:40 pm
1 stop6h 27m
See travel insights to St. Louis from
How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Washington, D.C. Dulles Intl Airport and St. Louis?
Prices are currently low for flights on this route.
Typical prices usually range from $408 to $755.The lowest price recently found on this route was $240.
What is the cheapest month to fly to St. Louis?
In general, January is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $279. The month of February is another great option to travel to St. Louis, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around $373.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $367. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $481. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Washington, D.C. Dulles Intl Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $377 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $434 per ticket.
What is the cheapest Washington, D.C. Dulles Intl to Lambert-St Louis flight route?
Fly from Washington, D.C. Dulles Intl to Lambert-St Louis for the best Washington, D.C. Dulles Intl - Lambert-St Louis flight prices
What cabin class options are available on Washington, D.C. Dulles Intl Airport to St. Louis flights?
There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl Airport to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Washington, D.C. Dulles Intl Airport to St. Louis flights?
No. A direct flight is the cheapest option for a flight between Washington, D.C. Dulles Intl Airport to St. Louis.
What is the cheapest airline that flies from Washington, D.C. Dulles Intl to Lambert-St Louis?
United Airlines and Delta are the most popular carriers operating from Washington, D.C. Dulles Intl to Lambert-St Louis
What airlines fly to St. Louis?
United Airlines, Delta and Frontier are the top three most popular airlines that fly to St. Louis from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 88% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from Washington, D.C. Dulles Intl Airport to St. Louis on average per day?
As of October 2026, 7 flights take off from Washington, D.C. Dulles Intl Airport and land in St. Louis each day. The most common flight departure time for this route is 5:00PM, with 66% of daily flights taking off in the afternoon.
How many flights depart from Washington, D.C. Dulles Intl Airport to St. Louis on average per week?
As of October 2026, there are 53 flights per week flying from Washington, D.C. Dulles Intl Airport to St. Louis. The most common day of the week flights depart is Mon, with 15% of flights taking off on this day.
When to book flights from Washington, D.C. Dulles Intl Airport to St. Louis
Cheap Washington, D.C. Dulles Intl Airport to St. Louis (IAD to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to St. Louis
Frequently asked questions about flying from Washington, D.C. Dulles Intl Airport to St. Louis
How far is Washington, D.C. Dulles Intl to Lambert-St Louis by plane?
The straight-line distance from Washington, D.C. Dulles Intl to Lambert-St Louis is 685.9 mi. By plane, this route typically takes 2h 21m.
When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport?
Prices for flights from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport?
As of October 2026, there are 4 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Washington, D.C. Dulles Intl Airport to St. Louis?
Based on momondo bookings for flights between Washington, D.C. Dulles Intl Airport and St. Louis, the leading plane model is Canadair (Bombardier) Regional Jet CRJ-550, making up 56.38% of the total bookings. Other popular models include Embraer 175 with 8.51%, Boeing 737 MAX 8 with 6.38%, and Airbus A319 with 6.38%.
What is the most popular airline from Washington, D.C. Dulles Intl Airport to St. Louis?
Based on momondo bookings for flights between Washington, D.C. Dulles Intl Airport and St. Louis, the leading airline is United Airlines, making up 82% of the total bookings. Other popular airlines include Delta with 7%, Frontier with 7%, and American Airlines with 4%.
Best airlines flying from Washington, D.C. Dulles Intl Airport to St. Louis
Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $78 | Free Cancellation | Rating 5.5 2,542 reviews | |||
| PriceFrom $124 | Free Cancellation | Rating 7.8 8,653 reviews | |||
| PriceFrom $254 | Free Cancellation | Rating 7.0 12,150 reviews | |||
| PriceFrom $278 | Free Cancellation | Rating 7.4 10,351 reviews |
United Airlines Flights From Washington, D.C. Dulles Intl Airport to St. Louis
United Airlines is one of the most popular airlines flying from Washington, D.C. Dulles Intl Airport to St. Louis, operating 13 flights/week on average for this route. A good United Airlines flight deal for Washington, D.C. Dulles Intl Airport to St. Louis starts from $278 round-trip, up to an average price of $564. Our users have rated United Airlines at 7.4/10.
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Why should I use momondo to find a flight deal from Washington, D.C. to St. Louis?
It is quick and easy to find Washington, D.C. to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.
Can I find flights from Washington, D.C. to St. Louis with flexible booking policies on momondo?
Yes. All flights to St. Louis from Washington, D.C. on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Washington, D.C. to St. Louis?
momondo provides multiple filters to help you find the best flight to St. Louis from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Washington, D.C. to St. Louis right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to St. Louis from Washington, D.C.. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.