Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Washington, D.C. Dulles Intl Airport to St. Louis from $60

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 2/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Washington, D.C. Dulles Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:39 pm - 6:51 am
IAD
-
STL
14h 12m1 stop
Frontier Logo
3:49 pm - 7:24 am
STL
-
IAD
14h 35m1 stop
$259Frontier
Sun, Mar 1 - Thu, Mar 5
United Airlines Logo
9:00 am - 10:36 am
IAD
-
STL
2h 36mnonstop
United Airlines Logo
8:30 am - 11:40 am
STL
-
IAD
2h 10mnonstop
$265United Airlines
Wed, Feb 4 - Thu, Feb 5
Frontier Logo
10:08 pm - 6:51 am
IAD
-
STL
9h 43m1 stop
Frontier Logo
5:42 pm - 8:33 am
STL
-
IAD
13h 51m1 stop
$266Frontier
Fri, Jan 16 - Sat, Jan 24
United Airlines Logo
5:50 pm - 7:27 pm
IAD
-
STL
2h 37mnonstop
United Airlines Logo
8:30 am - 11:40 am
STL
-
IAD
2h 10mnonstop
$267United Airlines
Fri, Jan 23 - Sat, Jan 24
Delta Logo
6:00 am - 9:39 am
IAD
-
STL
4h 39m1 stop
Delta Logo
5:56 pm - 11:06 pm
STL
-
IAD
4h 10m1 stop
$271Delta
Sat, Jan 17 - Sat, Jan 24
Frontier Logo
10:10 am - 11:59 pm
IAD
-
STL
14h 49m1 stop
Frontier Logo
8:12 pm - 11:31 pm
STL
-
IAD
26h 19m2 stops
$274Frontier
Thu, Mar 5 - Sat, Mar 7
Delta Logo
7:35 pm - 11:36 pm
IAD
-
STL
5h 01m1 stop
Delta Logo
6:35 am - 11:53 am
STL
-
IAD
4h 18m1 stop
$275Delta
Tue, Feb 17 - Wed, Feb 25
Frontier Logo
7:14 pm - 1:09 pm
IAD
-
STL
18h 55m2 stops
Frontier Logo
3:49 pm - 7:24 am
STL
-
IAD
14h 35m1 stop
$276Frontier
Sun, Mar 1 - Thu, Mar 5
United Airlines Logo
5:50 pm - 7:27 pm
IAD
-
STL
2h 37mnonstop
United Airlines Logo
9:57 am - 4:00 pm
STL
-
IAD
5h 03m1 stop
$277United Airlines
Fri, Jan 23 - Sat, Jan 24
Frontier Logo
8:49 am - 10:34 pm
IAD
-
STL
14h 45m1 stop
Frontier Logo
8:39 am - 7:58 pm
STL
-
IAD
10h 19m1 stop
$282Frontier
Thu, Jan 15 - Fri, Jan 16

United Airlines flights from Washington, D.C. Dulles Intl Airport to St. Louis

Our best United Airlines deals on Washington, D.C. Dulles Intl Airport to St. Louis flight tickets
United Airlines
Feb 4
IAD9:00 amWashington, D.C. Dulles Intl
2h 36m
STL10:36 amLambert-St Louis
Feb 5
STL8:30 amLambert-St Louis
2h 10m
IAD11:40 amWashington, D.C. Dulles Intl
$265
Find similar
United Airlines
Jan 24
IAD5:38 pmWashington, D.C. Dulles Intl
7h 21m
1 stop
STL11:59 pmLambert-St Louis
Jan 26
STL8:30 amLambert-St Louis
2h 10m
IAD11:40 amWashington, D.C. Dulles Intl
$286
Find similar
United Airlines
Feb 4
IAD9:00 amWashington, D.C. Dulles Intl
2h 36m
STL10:36 amLambert-St Louis
Feb 6
STL8:30 amLambert-St Louis
2h 10m
IAD11:40 amWashington, D.C. Dulles Intl
$288
Find similar

American Airlines flights from Washington, D.C. Dulles Intl Airport to St. Louis

Our best American Airlines deals on Washington, D.C. Dulles Intl Airport to St. Louis flight tickets
American Airlines
Jan 21
IAD11:34 amWashington, D.C. Dulles Intl
4h 30m
1 stop
STL3:04 pmLambert-St Louis
Jan 26
STL3:54 pmLambert-St Louis
6h 18m
1 stop
IAD11:12 pmWashington, D.C. Dulles Intl
$287
Find similar
American Airlines
Jan 27
IAD5:46 pmWashington, D.C. Dulles Intl
6h 26m
1 stop
STL11:12 pmLambert-St Louis
Feb 3
STL6:00 amLambert-St Louis
10h 16m
2 stops
IAD5:16 pmWashington, D.C. Dulles Intl
$319
Find similar
American Airlines
Jan 17
IAD1:08 pmWashington, D.C. Dulles Intl
6h 26m
1 stop
STL6:34 pmLambert-St Louis
Jan 20
STL11:05 amLambert-St Louis
11h 07m
2 stops
IAD11:12 pmWashington, D.C. Dulles Intl
$324
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 1, 2026.
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

Price

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sun 3/1

5:39 pm-6:51 am

1 stop14h 12m

Lambert-St Louis

Thu 3/5

3:49 pm-7:24 am

1 stop14h 35m

$259

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 2/4

9:00 am-10:36 am

Nonstop2h 36m

Lambert-St Louis

Thu 2/5

8:30 am-11:40 am

Nonstop2h 10m

$265

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 1/16

10:08 pm-6:51 am

1 stop9h 43m

Lambert-St Louis

Sat 1/24

5:42 pm-8:33 am

1 stop13h 51m

$266

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 1/23

5:50 pm-7:27 pm

Nonstop2h 37m

Lambert-St Louis

Sat 1/24

8:30 am-11:40 am

Nonstop2h 10m

$267

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 1/17

6:00 am-9:39 am

1 stop4h 39m

Lambert-St Louis

Sat 1/24

5:56 pm-11:06 pm

1 stop4h 10m

$271

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 3/5

10:10 am-11:59 pm

1 stop14h 49m

Lambert-St Louis

Sat 3/7

8:12 pm-11:31 pm

2 stops26h 19m

$274

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 2/17

7:35 pm-11:36 pm

1 stop5h 01m

Lambert-St Louis

Wed 2/25

6:35 am-11:53 am

1 stop4h 18m

$275

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sun 3/1

7:14 pm-1:09 pm

2 stops18h 55m

Lambert-St Louis

Thu 3/5

3:49 pm-7:24 am

1 stop14h 35m

$276

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 1/23

5:50 pm-7:27 pm

Nonstop2h 37m

Lambert-St Louis

Sat 1/24

9:57 am-4:00 pm

1 stop5h 03m

$277

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 1/15

8:49 am-10:34 pm

1 stop14h 45m

Lambert-St Louis

Fri 1/16

8:39 am-7:58 pm

1 stop10h 19m

$282

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 cheapest month to fly to St. Louis?

In general, August 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 $290. The month of July is another great option to travel to St. Louis, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around $292.

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 Saturday when prices can be found for as low as $331. 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 Sunday because tickets tend to average around $411. 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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as $305 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $381 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

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $393 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Washington, D.C. Dulles Intl Airport for as low as $191 on momondo.

What cabin class options are available on Washington, D.C. Dulles Intl to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl to Lambert-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?

You could potentially save up to 10% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to St. Louis flight.

How have Washington, D.C. Dulles Intl Airport to St. Louis flight prices changed over time?

As of January 2026, prices for Washington, D.C. Dulles Intl Airport to St. Louis flights are approximately 67% more expensive when compared to flights at the same time last year.

When to book flights from Washington, D.C. Dulles Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

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

Best Price Found

$117

Fastest flight time

2h 23m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Washington, D.C. Dulles Intl Airport in the past 72 hours is $117. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to St. Louis found on momondo in the last 72 hours is $279.
The fastest flight from Washington, D.C. Dulles Intl Airport to St. Louis takes 2h 23m
Direct flights go from Washington, D.C. Dulles Intl Airport to St. Louis every day.
There is 1 airport in St. Louis. From Washington, D.C. Dulles Intl Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • 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 23m.

  • 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?

  • 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?

  • What is the most popular airline from Washington, D.C. Dulles Intl Airport to St. Louis?

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
FrontierPriceFrom $78Free CancellationRating
5.7
3,066 reviews
Search Frontier flights
DeltaPriceFrom $149Free CancellationRating
7.9
8,017 reviews
Search Delta flights
United AirlinesPriceFrom $243Free CancellationRating
7.4
9,127 reviews
Search United Airlines flights
American AirlinesPriceFrom $254Free CancellationRating
7.2
11,069 reviews
Search American Airlines flights

  • 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 12 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 $243 round-trip, up to an average price of $470. Our users have rated United Airlines at 7.4/10.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Glencoe
Eureka
Festus
Edwardsville
Litchfield
Shrewsbury

Why use momondo?

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.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 1/31
Sat 2/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States