What is the cheapest airline that flies from Lambert-St Louis to Washington, D.C. Dulles Intl?

United Airlines, Delta, and Frontier are the most popular carriers operating from Lambert-St Louis to Washington, D.C. Dulles Intl

How many flights depart from St. Louis to Washington, D.C. Dulles Intl Airport on average per day?

7 flights are operational daily from St. Louis to Washington, D.C. Dulles Intl Airport as of June 2026. The most popular departure time for this route is 8:00AM, with 57% of flights per day taking off at noon.

What airlines fly to Washington, D.C. Dulles Intl Airport?

United Airlines, Delta and Frontier are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from St. Louis according to our data. United Airlines is the first choice among our users, with 56% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 4 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport?

Prices for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport?

The number of operators available for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport is 4 as of June 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport.

What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$129 Cheap Flights from St. Louis to Washington, D.C. Dulles Intl Airport in 2026

Q: What is the typical price of a round-trip flight between St. Louis and Washington, D.C. Dulles Intl Airport?

Prices are currently low for flights on this route. Typical prices usually range from $296 to $623. The lowest price recently found on this route was $268.

Q: How many flights depart from St. Louis to Washington, D.C. Dulles Intl Airport on average per week?

The number of flights available between St. Louis and Washington, D.C. Dulles Intl Airport is 49 per week as of June 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.

Discover deals from 900+ travel sites with momondo.

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

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:57 pm - 10:55 pm

STL

IAD

4h 58m

1 stop

11:10 am - 11:59 pm

IAD

STL

13h 49m

1 stop

$268Frontier

Mon, Jul 27 - Mon, Aug 3

4:57 pm - 10:55 pm

STL

IAD

4h 58m

1 stop

9:50 am - 6:05 pm

IAD

STL

9h 15m

1 stop

$270Frontier

Mon, Jul 20 - Wed, Jul 22

4:57 pm - 7:38 pm

STL

IAD

25h 41m

2 stops

8:33 pm - 5:37 pm

IAD

STL

22h 04m

1 stop

$271Frontier

Sat, Aug 8 - Wed, Aug 12

8:08 pm - 10:16 am

STL

IAD

13h 08m

2 stops

7:49 am - 5:37 pm

IAD

STL

10h 48m

1 stop

$273Frontier

Tue, Jul 21 - Tue, Jul 28

4:57 pm - 4:34 pm

STL

IAD

22h 37m

1 stop

9:05 pm - 1:21 pm

IAD

STL

41h 16m

2 stops

$274Multiple Airlines

Fri, Jul 24 - Sat, Aug 8

4:57 pm - 4:34 pm

STL

IAD

22h 37m

1 stop

8:33 pm - 8:57 am

IAD

STL

13h 24m

1 stop

$275Frontier

Fri, Jul 17 - Sun, Jul 19

6:13 pm - 12:10 am

STL

IAD

4h 57m

1 stop

8:21 pm - 11:58 pm

IAD

STL

4h 37m

1 stop

$276American Airlines

Mon, Jul 27 - Sat, Aug 1

2:00 pm - 2:02 pm

STL

IAD

23h 02m

2 stops

8:33 pm - 8:57 am

IAD

STL

13h 24m

1 stop

$277Multiple Airlines

Fri, Jul 10 - Fri, Jul 17

8:43 am - 11:55 am

STL

IAD

2h 12mnonstop

3:39 pm - 9:26 pm

IAD

STL

6h 47m

1 stop

$278United Airlines

Sat, Jul 25 - Sat, Aug 1

6:45 pm - 5:14 pm

STL

IAD

21h 29m

2 stops

8:59 am - 5:50 pm

IAD

STL

9h 51m

1 stop

$281Frontier

Wed, Aug 19 - Tue, Aug 25

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

Our best United Airlines deals on St. Louis to Washington, D.C. Dulles Intl Airport flight tickets

United Airlines

Jul 25

STL8:43 amLambert-St Louis

2h 12m

IAD11:55 amWashington, D.C. Dulles Intl

Aug 1

IAD3:39 pmWashington, D.C. Dulles Intl

6h 47m

1 stop

STL9:26 pmLambert-St Louis

$278

United Airlines

Aug 11

STL8:40 amLambert-St Louis

2h 17m

IAD11:57 amWashington, D.C. Dulles Intl

Aug 21

IAD8:20 amWashington, D.C. Dulles Intl

4h 42m

1 stop

STL12:02 pmLambert-St Louis

$297

United Airlines

Aug 19

STL1:00 pmLambert-St Louis

2h 06m

IAD4:06 pmWashington, D.C. Dulles Intl

Aug 25

IAD6:16 amWashington, D.C. Dulles Intl

6h 01m

1 stop

STL11:17 amLambert-St Louis

$299

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

Our best Frontier deals on St. Louis to Washington, D.C. Dulles Intl Airport flight tickets

Frontier

Jul 27

STL4:57 pmLambert-St Louis

4h 58m

1 stop

IAD10:55 pmWashington, D.C. Dulles Intl

Aug 3

IAD11:10 amWashington, D.C. Dulles Intl

13h 49m

1 stop

STL11:59 pmLambert-St Louis

$268

Frontier

Jul 20

STL4:57 pmLambert-St Louis

4h 58m

1 stop

IAD10:55 pmWashington, D.C. Dulles Intl

Jul 22

IAD9:50 amWashington, D.C. Dulles Intl

9h 15m

1 stop

STL6:05 pmLambert-St Louis

$270

Frontier

Aug 8

STL4:57 pmLambert-St Louis

25h 41m

2 stops

IAD7:38 pmWashington, D.C. Dulles Intl

Aug 12

IAD8:33 pmWashington, D.C. Dulles Intl

22h 04m

1 stop

STL5:37 pmLambert-St Louis

$271

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Mon 7/27

4:57 pm-10:55 pm

1 stop4h 58m

Washington, D.C. Dulles Intl

Mon 8/3

11:10 am-11:59 pm

1 stop13h 49m

$268

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Mon 7/20

4:57 pm-10:55 pm

1 stop4h 58m

Washington, D.C. Dulles Intl

Wed 7/22

9:50 am-6:05 pm

1 stop9h 15m

$270

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 8/8

4:57 pm-7:38 pm

2 stops25h 41m

Washington, D.C. Dulles Intl

Wed 8/12

8:33 pm-5:37 pm

1 stop22h 04m

$271

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 7/21

8:08 pm-10:16 am

2 stops13h 08m

Washington, D.C. Dulles Intl

Tue 7/28

7:49 am-5:37 pm

1 stop10h 48m

$273

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Fri 7/24

4:57 pm-4:34 pm

1 stop22h 37m

Washington, D.C. Dulles Intl

Sat 8/8

9:05 pm-1:21 pm

2 stops41h 16m

$274

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Fri 7/17

4:57 pm-4:34 pm

1 stop22h 37m

Washington, D.C. Dulles Intl

Sun 7/19

8:33 pm-8:57 am

1 stop13h 24m

$275

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Mon 7/27

6:13 pm-12:10 am

1 stop4h 57m

Washington, D.C. Dulles Intl

Sat 8/1

8:21 pm-11:58 pm

1 stop4h 37m

$276

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Fri 7/10

2:00 pm-2:02 pm

2 stops23h 02m

Washington, D.C. Dulles Intl

Fri 7/17

8:33 pm-8:57 am

1 stop13h 24m

$277

Quickest round-trip

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 7/25

8:43 am-11:55 am

Nonstop2h 12m

Washington, D.C. Dulles Intl

Sat 8/1

3:39 pm-9:26 pm

1 stop6h 47m

$278

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Wed 8/19

6:45 pm-5:14 pm

2 stops21h 29m

Washington, D.C. Dulles Intl

Tue 8/25

8:59 am-5:50 pm

1 stop9h 51m

$281

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Washington, D.C. Dulles Intl Airport

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

Prices

Airlines

Other information

What is the typical price of a round-trip flight between St. Louis and Washington, D.C. Dulles Intl Airport?

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

In general, February is the cheapest month to fly from St. Louis to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $170. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $315.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Tuesday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $770. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Washington, D.C. Dulles Intl Airport for around $1,135.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from St. Louis in the morning is the least expensive time of day to depart. momondo users have found prices as low as $845 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,094 on average. Flights to Washington, D.C. Dulles Intl Airport from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Lambert-St Louis to Washington, D.C. Dulles Intl flight route?

Fly from Lambert-St Louis to Washington, D.C. Dulles Intl for the best Lambert-St Louis - Washington, D.C. Dulles Intl flight prices

How far in advance should I book a flight from St. Louis to Washington, D.C. Dulles Intl Airport?

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $373 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from St. Louis for as low as $263 on momondo.

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

There are 4 cabin classes available to choose from on St. Louis to Washington, D.C. Dulles Intl Airport 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 St. Louis to Washington, D.C. Dulles Intl Airport flights?

You could potentially save up to 42% on your flight if you consider stops on a St. Louis to Washington, D.C. Dulles Intl Airport flight.

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

As of June 2026, prices for St. Louis to Washington, D.C. Dulles Intl Airport flights are approximately 23% more expensive when compared to flights at the same time last year.

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

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

Estimated round-trip price

Cheap St. Louis to Washington, D.C. Dulles Intl Airport (STL to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Washington, D.C. Dulles Intl Airport

Best Price Found	$222
Fastest flight time	2h 05m
Direct flights	Every day

The best one-way flight to Washington, D.C. Dulles Intl Airport from St. Louis in the past 72 hours is $222. The best round-trip flight deal from St. Louis to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $687.

The fastest flight from St. Louis to Washington, D.C. Dulles Intl Airport takes 2h 05m

Direct flights go from St. Louis to Washington, D.C. Dulles Intl Airport every day.

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Frequently asked questions about flying from St. Louis to Washington, D.C. Dulles Intl Airport

How far is Lambert-St Louis to Washington, D.C. Dulles Intl by plane?
The straight-line distance from Lambert-St Louis to Washington, D.C. Dulles Intl is 685.9 mi. Flights usually cover this in 2h 05m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport?
Prices for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport?
The number of operators available for flights from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport is 4 as of June 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Washington, D.C. Dulles Intl Airport.
What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?
The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Washington, D.C. Dulles Intl Airport?
Based on momondo bookings for flights between St. Louis and Washington, D.C. Dulles Intl Airport, the leading plane model is Canadair (Bombardier) Regional Jet CRJ-550, making up 43.86% of the total bookings. Other popular models include Canadair (Bombardier) Regional Jet 900 with 10.53%, Boeing 737-800 Passenger/BBJ2 (winglets) with 8.77%, and Airbus A330-300 with 8.77%.
What is the most popular airline from St. Louis to Washington, D.C. Dulles Intl Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Washington, D.C. Dulles Intl Airport is United Airlines (56% of total bookings). The next most popular airlines are Delta (20%), Frontier (14%), and American Airlines (10%).

Best airlines flying from St. Louis to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Washington, D.C. Dulles Intl Airport with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $90	Free Cancellation	Rating 5.6 2,856 reviews	Search Frontier flights
Delta	PriceFrom $98	Free Cancellation	Rating 7.8 8,454 reviews	Search Delta flights
American Airlines	PriceFrom $257	Free Cancellation	Rating 7.1 11,771 reviews	Search American Airlines flights
United Airlines	PriceFrom $271	Free Cancellation	Rating 7.4 9,895 reviews	Search United Airlines flights

United Airlines Flights From St. Louis to Washington, D.C. Dulles Intl Airport
United Airlines flight deals from St. Louis to Washington, D.C. Dulles Intl Airport start from $271 round-trip. Over the 14 United Airlines flights for this route in a normal week, average airfare is usually $469 round-trip - but some users have found much cheaper deals with momondo.

Alexandria

National Harbor

Arlington

Gettysburg

Winchester

Waldorf

Laurel

Woodbridge

Fredericksburg

Gaithersburg

Linthicum Heights

Rockville

Colonial Beach

Towson

Manassas

Silver Spring

Sterling

Tysons

Springfield

Bethesda

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Why should I use momondo to find a flight deal from St. Louis to Washington, D.C.?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Washington, D.C. for you.

Can I find flights from St. Louis to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for St. Louis to Washington, D.C. flights to just show those with flexible booking policies.

How can momondo help me find flights from St. Louis to Washington, D.C.?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Washington, D.C..

I’m not ready to book a flight from St. Louis to Washington, D.C. right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Cheap flights from St. Louis to Washington, D.C. from $129

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Washington, D.C. departing on 9/24. 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 St. Louis to Washington, D.C. Dulles Intl Airport

Our best United Airlines deals on St. Louis to Washington, D.C. Dulles Intl Airport flight tickets

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

Our best Frontier deals on St. Louis to Washington, D.C. Dulles Intl Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Washington, D.C. Dulles Intl Airport that are best for you.

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from St. Louis to Washington, D.C. Dulles Intl Airport

What is the typical price of a round-trip flight between St. Louis and Washington, D.C. Dulles Intl Airport?

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

What is the cheapest Lambert-St Louis to Washington, D.C. Dulles Intl flight route?

How far in advance should I book a flight from St. Louis to Washington, D.C. Dulles Intl Airport?

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

Can stopping save me money on St. Louis to Washington, D.C. Dulles Intl Airport flights?

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

What is the cheapest airline that flies from Lambert-St Louis to Washington, D.C. Dulles Intl?

What airlines fly to Washington, D.C. Dulles Intl Airport?

How many flights depart from St. Louis to Washington, D.C. Dulles Intl Airport on average per day?

How many flights depart from St. Louis to Washington, D.C. Dulles Intl Airport on average per week?

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

Cheap St. Louis to Washington, D.C. Dulles Intl Airport (STL to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Washington, D.C. Dulles Intl Airport

Best Price Found

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Direct flights

Frequently asked questions about flying from St. Louis to Washington, D.C. Dulles Intl Airport

Best airlines flying from St. Louis to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Washington, D.C. Dulles Intl Airport with momondo

United Airlines Flights From St. Louis to Washington, D.C. Dulles Intl Airport

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