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Cheap flights from Washington to St. Louis from $54

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 to St. Louis departing on 3/6. 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

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Find the cheapest flights from Washington to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
3:00 pm - 11:59 pm
SEA
-
STL
6h 59m
1 stop
American Airlines Logo
6:36 pm - 12:24 am
STL
-
SEA
7h 48m
1 stop
$159American Airlines
Sat, Feb 21 - Sat, Feb 28
Frontier Logo
9:26 pm - 5:46 pm
SEA
-
STL
18h 20m
1 stop
Frontier Logo
8:12 pm - 10:19 am
STL
-
SEA
16h 07m
1 stop
$166Frontier
Fri, Feb 27 - Sat, Mar 7
American Airlines Logo
10:08 pm - 8:35 am
SEA
-
STL
8h 27m
1 stop
American Airlines Logo
2:06 pm - 9:06 pm
STL
-
SEA
9h 00m
1 stop
$168American Airlines
Sun, Feb 22 - Tue, Feb 24
Frontier Logo
12:00 pm - 1:56 pm
SEA
-
STL
23h 56m
1 stop
Frontier Logo
10:11 pm - 10:54 am
STL
-
SEA
14h 43m
1 stop
$173Frontier
Fri, Feb 20 - Mon, Feb 23
Delta Logo
4:40 pm - 12:25 am
SEA
-
STL
5h 45m
1 stop
Delta Logo
6:40 pm - 12:09 am
STL
-
SEA
7h 29m
1 stop
$177Delta
Mon, Feb 23 - Fri, Feb 27
Frontier Logo
1:16 pm - 6:51 am
SEA
-
STL
39h 35m
2 stops
Frontier Logo
8:12 pm - 10:19 am
STL
-
SEA
16h 07m
1 stop
$182Frontier
Sat, Feb 28 - Sat, Mar 7
Hawaiian Airlines Logo
7:55 am - 1:51 pm
SEA
-
STL
3h 56mnonstop
Hawaiian Airlines Logo
2:47 pm - 5:26 pm
STL
-
SEA
4h 39mnonstop
$186Hawaiian Airlines
Sat, Feb 21 - Sat, Feb 28
Alaska Airlines Logo
7:55 am - 1:51 pm
SEA
-
STL
3h 56mnonstop
Alaska Airlines Logo
7:00 am - 9:42 am
STL
-
SEA
4h 42mnonstop
$197Alaska Airlines
Tue, Mar 3 - Tue, Mar 10
Delta Logo
1:50 pm - 12:21 am
GEG
-
STL
8h 31m
1 stop
Delta Logo
5:25 pm - 9:29 pm
STL
-
GEG
6h 04m
1 stop
$237Delta
Wed, Mar 18 - Tue, Mar 31
Alaska Airlines Logo
10:39 am - 7:00 pm
PDX
-
STL
6h 21m
1 stop
Alaska Airlines Logo
6:20 pm - 8:37 pm
STL
-
PDX
4h 17mnonstop
$259Alaska Airlines
Wed, Jun 3 - Sun, Jun 7

Frontier flights from State of Washington to St. Louis

Our best Frontier deals on State of Washington to St. Louis flight tickets
Frontier
Feb 27
SEA9:26 pmSeattle/Tacoma Intl
18h 20m
1 stop
STL5:46 pmLambert-St Louis
Mar 7
STL8:12 pmLambert-St Louis
16h 07m
1 stop
SEA10:19 amSeattle/Tacoma Intl
$166
Frontier
Feb 20
SEA12:00 pmSeattle/Tacoma Intl
23h 56m
1 stop
STL1:56 pmLambert-St Louis
Feb 23
STL10:11 pmLambert-St Louis
14h 43m
1 stop
SEA10:54 amSeattle/Tacoma Intl
$173
Frontier
Mar 16
SEA9:36 pmSeattle/Tacoma Intl
12h 39m
1 stop
STL12:15 pmLambert-St Louis
Mar 23
STL8:12 pmLambert-St Louis
50h 51m
2 stops
SEA9:03 pmSeattle/Tacoma Intl
$204

Delta flights from State of Washington to St. Louis

Our best Delta deals on State of Washington to St. Louis flight tickets
Delta
Mar 26
SEA6:00 amSeattle/Tacoma Intl
8h 32m
1 stop
STL4:32 pmLambert-St Louis
Mar 30
STL2:12 pmLambert-St Louis
6h 18m
1 stop
SEA6:30 pmSeattle/Tacoma Intl
$177
Delta
Mar 4
PSC6:45 amPasco Tri Cities
6h 09m
1 stop
STL2:54 pmLambert-St Louis
Mar 7
STL3:40 pmLambert-St Louis
6h 24m
1 stop
PSC8:04 pmPasco Tri Cities
$237
Delta
Mar 4
PSC1:00 pmPasco Tri Cities
8h 23m
2 stops
STL11:23 pmLambert-St Louis
Mar 7
STL3:40 pmLambert-St Louis
6h 24m
1 stop
PSC8:04 pmPasco Tri Cities
$242

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 February 1, 2026.
Use the filters below to find and compare flights from Washington to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 2/21

3:00 pm-11:59 pm

1 stop6h 59m

Lambert-St Louis

Sat 2/28

6:36 pm-12:24 am

1 stop7h 48m

$159

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 2/27

9:26 pm-5:46 pm

1 stop18h 20m

Lambert-St Louis

Sat 3/7

8:12 pm-10:19 am

1 stop16h 07m

$166

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 2/22

10:08 pm-8:35 am

1 stop8h 27m

Lambert-St Louis

Tue 2/24

2:06 pm-9:06 pm

1 stop9h 00m

$168

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 2/20

12:00 pm-1:56 pm

1 stop23h 56m

Lambert-St Louis

Mon 2/23

10:11 pm-10:54 am

1 stop14h 43m

$173

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 2/23

4:40 pm-12:25 am

1 stop5h 45m

Lambert-St Louis

Fri 2/27

6:40 pm-12:09 am

1 stop7h 29m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 2/28

1:16 pm-6:51 am

2 stops39h 35m

Lambert-St Louis

Sat 3/7

8:12 pm-10:19 am

1 stop16h 07m

$182

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 2/21

7:55 am-1:51 pm

Nonstop3h 56m

Lambert-St Louis

Sat 2/28

2:47 pm-5:26 pm

Nonstop4h 39m

$186

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 3/3

7:55 am-1:51 pm

Nonstop3h 56m

Lambert-St Louis

Tue 3/10

7:00 am-9:42 am

Nonstop4h 42m

$197

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Wed 3/18

1:50 pm-12:21 am

1 stop8h 31m

Lambert-St Louis

Tue 3/31

5:25 pm-9:29 pm

1 stop6h 04m

$237

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 6/3

10:39 am-7:00 pm

1 stop6h 21m

Lambert-St Louis

Sun 6/7

6:20 pm-8:37 pm

Nonstop4h 17m

$259

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from State of Washington 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, January is the cheapest month to fly from State of Washington to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $268. The month of October is another great option to travel to St. Louis, with average flight prices from State of Washington averaging around $327.

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 Thursday when prices can be found for as low as $381. 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 $485. 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 State of Washington at noon is the least expensive time of day to depart. momondo users have found prices as low as $269 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $417 per ticket.

What is the cheapest Washington to Lambert-St Louis flight route?

Fly from Seattle/Tacoma Intl to Lambert-St Louis for the best Washington - 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 State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $375 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from State of Washington for as low as $262 on momondo.

What cabin class options are available on Washington to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on Washington 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 State of Washington to St. Louis flights?

You could potentially save up to 38% on your flight if you consider stops on a State of Washington to St. Louis flight.

Cheap State of Washington to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to St. Louis

Best Price Found

$174

Fastest flight time

3h 48m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from State of Washington in the past 72 hours is $174. The best round-trip flight deal from State of Washington to St. Louis found on momondo in the last 72 hours is $217.
The fastest flight from State of Washington to St. Louis takes 3h 48m
Direct flights go from State of Washington to St. Louis every day.
There is 1 airport in St. Louis. From State of Washington there are direct flights to Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from Washington to Lambert-St Louis Airport?

    Prices for flights from Washington to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Washington to Lambert-St Louis Airport?

  • How old do you have to be to fly from Washington 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 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 State of Washington to St. Louis?

Best airlines flying from State of Washington to St. Louis

Compare and see reviews for airlines that fly from State of Washington to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $94Free CancellationRating
7.9
8,128 reviews
Search Delta flights
FrontierPriceFrom $121Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
United AirlinesPriceFrom $157Free CancellationRating
7.4
9,226 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $181Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $182Free CancellationRating
8.0
4,273 reviews
Search Southwest flights
American AirlinesPriceFrom $188Free CancellationRating
7.2
11,211 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $228Free CancellationRating
8.0
11,825 reviews
Search Alaska Airlines flights

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
Florissant
O'Fallon
Collinsville
Fenton
St. Peters
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
Glencoe
Litchfield
Shrewsbury

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to St. Louis from Washington on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search for Washington to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to St. Louis from Washington. 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.

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