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Cheap flights from St. Louis to Washington, D.C. Dulles Intl Airport from $61

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. Dulles Intl Airport departing on 2/8. 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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Find the cheapest flights from St. Louis to Washington, D.C.

Cheap round-trip flights

These are some of the best round-trip flight deals from St. Louis to Washington, D.C. that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from St. Louis to Washington, D.C..

Cheap last minute flights

Planning a quick getaway from St. Louis to Washington, D.C.? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Washington, D.C., so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from St. Louis to Washington, D.C.

Find recent round-trip train or bus tickets from St. Louis to Washington, D.C..

All round-trip flight deals to Washington, D.C.

The cheapest plane tickets to Washington, D.C. found on KAYAK recently.
5:05 pm - 5:56 pmSTL-IAD
23h 51m1 stop
6:03 pm - 11:27 pmIAD-STL
6h 24m1 stop
$118Frontier
Find Deal
mié., ene. 8 - lun., ene. 13
5:05 pm - 6:18 pmSTL-IAD
24h 13m1 stop
6:03 pm - 11:27 pmIAD-STL
6h 24m1 stop
$138Frontier
Find Deal
jue., ene. 9 - lun., ene. 13
5:05 pm - 6:18 pmSTL-IAD
24h 13m1 stop
5:57 pm - 11:27 pmIAD-STL
6h 30m1 stop
$139Frontier
Find Deal
jue., ene. 9 - dom., ene. 12
5:05 pm - 6:18 pmSTL-IAD
24h 13m1 stop
5:57 pm - 11:27 pmIAD-STL
6h 30m1 stop
$148Frontier
Find Deal
jue., ene. 9 - dom., ene. 12
8:25 am - 11:43 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$229United Airlines
Find Deal
lun., ene. 6 - mié., ene. 8
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:25 am - 12:16 pmIAD-STL
4h 51m1 stop
$239United Airlines
Find Deal
sáb., ene. 11 - mar., ene. 14
5:50 pm - 11:13 pmSTL-IAD
4h 23m1 stop
6:05 am - 9:43 amIAD-STL
4h 38m1 stop
$248Delta
Find Deal
mar., mar. 4 - sáb., mar. 15
7:11 pm - 12:09 amSTL-IAD
3h 58m1 stop
6:05 am - 9:43 amIAD-STL
4h 38m1 stop
$262Delta
Find Deal
lun., mar. 10 - mié., mar. 19
6:29 pm - 11:58 pmSTL-IAD
4h 29m1 stop
8:05 pm - 11:46 pmIAD-STL
4h 41m1 stop
$277American Airlines
Find Deal
vie., ene. 31 - vie., feb. 7
6:32 pm - 11:59 pmSTL-IAD
4h 27m1 stop
9:20 am - 1:00 pmIAD-STL
4h 40m1 stop
$321American Airlines
Find Deal
lun., mar. 24 - sáb., mar. 29
5:05 pm - 4:57 pmSTL-IAD
22h 52m1 stop
$61Frontier
Find Deal
sáb., feb. 8
8:22 am - 4:57 pmSTL-IAD
7h 35m1 stop
$64Frontier
Find Deal
dom., ene. 26
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
$115United Airlines
Find Deal
lun., ene. 20
9:44 am - 4:13 pmSTL-IAD
5h 29m1 stop
$124United Airlines
Find Deal
jue., ene. 23
7:11 pm - 12:09 amSTL-IAD
3h 58m1 stop
$138Delta
Find Deal
lun., mar. 10
2:15 pm - 7:35 pmSTL-IAD
4h 20m1 stop
$188American Airlines
Find Deal
vie., ene. 17
3:48 pm - 4:15 pmSTL-IAD
23h 27m3 stops
mar., feb. 18
5:40 am - 7:35 pmSTL-IAD
12h 55m2 stops
$192American Airlines
Find Deal
mié., ene. 15
5:55 pm - 11:02 pmSTL-IAD
4h 07m1 stop
$194Delta
Find Deal
dom., ene. 5
3:48 pm - 4:15 pmSTL-IAD
23h 27m3 stops
mar., feb. 11
3:53 pm - 7:20 amSTL-IAD
14h 27m1 stop
8:11 am - 11:40 pmIAD-STL
16h 29m1 stop
$400Frontier
Find Deal
jue., dic. 19 - lun., ene. 6
5:45 pm - 7:15 amSTL-IAD
12h 30m1 stop
8:11 am - 11:40 pmIAD-STL
16h 29m1 stop
$483Frontier
Find Deal
lun., dic. 23 - lun., dic. 30
1:05 pm - 4:13 pmSTL-IAD
2h 08mnonstop
6:50 pm - 8:23 pmIAD-STL
2h 33mnonstop
$539United Airlines
Find Deal
jue., dic. 19 - lun., ene. 6
1:05 pm - 4:13 pmSTL-IAD
2h 08mnonstop
10:09 pm - 12:16 pmIAD-STL
15h 07m1 stop
$543United Airlines
Find Deal
lun., dic. 23 - mar., ene. 21
5:30 pm - 11:59 pmSTL-IAD
5h 29m1 stop
6:50 pm - 8:23 pmIAD-STL
2h 33mnonstop
$549United Airlines
Find Deal
jue., dic. 19 - lun., ene. 6
5:00 am - 11:48 amSTL-IAD
5h 48m1 stop
10:09 pm - 12:16 pmIAD-STL
15h 07m1 stop
$553United Airlines
Find Deal
lun., dic. 23 - mar., ene. 21
6:00 am - 11:37 amSTL-IAD
4h 37m1 stop
6:00 am - 9:33 amIAD-STL
4h 33m1 stop
$558Delta
Find Deal
jue., dic. 19 - mar., dic. 31
12:59 pm - 6:02 pmSTL-IAD
4h 03m1 stop
7:15 am - 12:09 pmIAD-STL
5h 54m1 stop
$578Delta
Find Deal
vie., dic. 20 - lun., dic. 30
5:58 pm - 12:02 amSTL-IAD
5h 04m1 stop
5:00 am - 8:50 amIAD-STL
4h 50m1 stop
$633American Airlines
Find Deal
sáb., dic. 21 - vie., dic. 27
5:58 pm - 12:02 amSTL-IAD
5h 04m1 stop
5:00 am - 3:38 pmIAD-STL
11h 38m2 stops
$808American Airlines
Find Deal
sáb., dic. 21 - jue., ene. 2
8:25 am - 11:43 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$229United Airlines
Find Deal
lun., ene. 6 - mié., ene. 8
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$240United Airlines
Find Deal
sáb., ene. 11 - mar., ene. 14
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$263United Airlines
Find Deal
lun., ene. 13 - mar., ene. 14
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$266United Airlines
Find Deal
lun., ene. 13 - lun., ene. 20
8:25 am - 11:31 amSTL-IAD
2h 06mnonstop
8:20 am - 9:48 amIAD-STL
2h 28mnonstop
$280United Airlines
Find Deal
jue., abr. 17 - dom., abr. 20
12:55 pm - 4:03 pmSTL-IAD
2h 08mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$284United Airlines
Find Deal
vie., ene. 10 - mar., ene. 14
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$299United Airlines
Find Deal
lun., ene. 13 - dom., ene. 19
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$313United Airlines
Find Deal
dom., feb. 9 - mié., feb. 12
1:05 pm - 4:13 pmSTL-IAD
2h 08mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$317United Airlines
Find Deal
jue., ene. 2 - mié., ene. 8
8:15 am - 11:33 amSTL-IAD
2h 18mnonstop
8:50 am - 10:24 amIAD-STL
2h 34mnonstop
$343United Airlines
Find Deal
dom., ene. 19 - mié., ene. 22

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

Our best American Airlines deals on St. Louis to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines
Jan 31
STL6:29 pmLambert-St Louis
4h 29m
1 stop
IAD11:58 pmWashington, D.C. Dulles Intl
Feb 7
IAD8:05 pmWashington, D.C. Dulles Intl
4h 41m
1 stop
STL11:46 pmLambert-St Louis
American Airlines
Mar 24
STL6:32 pmLambert-St Louis
4h 27m
1 stop
IAD11:59 pmWashington, D.C. Dulles Intl
Mar 29
IAD9:20 amWashington, D.C. Dulles Intl
4h 40m
1 stop
STL1:00 pmLambert-St Louis
American Airlines
Jan 29
STL5:40 amLambert-St Louis
12h 55m
2 stops
IAD7:35 pmWashington, D.C. Dulles Intl
Feb 1
IAD1:52 pmWashington, D.C. Dulles Intl
4h 30m
1 stop
STL5:22 pmLambert-St Louis

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
Jan 8
STL5:05 pmLambert-St Louis
23h 51m
1 stop
IAD5:56 pmWashington, D.C. Dulles Intl
Jan 13
IAD6:03 pmWashington, D.C. Dulles Intl
6h 24m
1 stop
STL11:27 pmLambert-St Louis
Frontier
Jan 9
STL5:05 pmLambert-St Louis
24h 13m
1 stop
IAD6:18 pmWashington, D.C. Dulles Intl
Jan 13
IAD6:03 pmWashington, D.C. Dulles Intl
6h 24m
1 stop
STL11:27 pmLambert-St Louis
Frontier
Jan 9
STL5:05 pmLambert-St Louis
24h 13m
1 stop
IAD6:18 pmWashington, D.C. Dulles Intl
Jan 12
IAD5:57 pmWashington, D.C. Dulles Intl
6h 30m
1 stop
STL11:27 pmLambert-St Louis

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

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 Washington, D.C. Dulles Intl Airport?

In general, November 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 $303. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $310.

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 $314. When flying out on a Sunday, 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 $477.

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 evening is the least expensive time of day to depart. momondo users have found prices as low as $262 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $491 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 to Washington, D.C. Dulles Intl Airport?

The ideal time to book your flight to Washington, D.C. Dulles Intl Airport is 39 days in advance when prices tend to average $372. 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 $208 on momondo.

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

There are 4 cabin classes available to choose from on Lambert-St Louis to Washington, D.C. Dulles Intl 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 47% 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 December 2024, prices for St. Louis to Washington, D.C. Dulles Intl Airport flights are approximately 67% 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

$61

Fastest flight time

2h 06m

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 $61. 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 $118.
The fastest flight from St. Louis to Washington, D.C. Dulles Intl Airport takes 2h 06m
Direct flights go from St. Louis to Washington, D.C. Dulles Intl Airport every day.

  • 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 06m, 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?

  • 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?

  • What is the most popular airline 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
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $129Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $177Free CancellationRating
8.0
8,604 reviews
Search Delta flights
United AirlinesPriceFrom $211Free CancellationRating
7.4
9,059 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 $211 round-trip. Over the 6 United Airlines flights for this route in a normal week, average airfare is usually $458 round-trip - but some users have found much cheaper deals with momondo.


Why use momondo?

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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