How long does it take to fly to St. Louis?

Flight times from State of Washington to St. Louis vary, but if you’re flying out of Seattle and flying into St. Louis (one of the most popular routes), then the duration is 3h 52m on average. Another popular route from State of Washington to St. Louis is flying from Bellingham to St. Louis, which will take roughly 5h 51m. Keep in mind that layovers or delays could extend your travel time.

How many flights depart from State of Washington to St. Louis on average per day?

The number of flights available between State of Washington and St. Louis is 9 per day as of August 2025. The most frequent departure time is 6:00PM, with 39% of daily flights leaving in the evening.

How many flights depart from State of Washington to St. Louis on average per week?

The number of flights available between State of Washington and St. Louis is 63 per week as of August 2025. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.

What airlines fly to St. Louis?

Alaska Airlines, Delta and American Airlines are the top three most popular airlines that fly to St. Louis from State of Washington according to our data. Alaska Airlines is the first choice among our users, with 62% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 7 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Washington to Lambert-St Louis?

Frontier, United Airlines, and Southwest are the most popular carriers operating from Washington to Lambert-St Louis

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?

As of August 2025, there are 7 operators available to choose from 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.

$80 Cheap Flights from Washington to St. Louis in 2025

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Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:39 pm - 3:56 pmSEA-STL

19h 17m1 stop

7:52 pm - 12:07 pmSTL-SEA

18h 15m1 stop

$169Frontier

Find Deal

Fri, Oct 24 - Sun, Oct 26

11:10 pm - 10:15 amSEA-STL

9h 05m1 stop

11:10 am - 1:30 pmSTL-SEA

4h 20mnonstop

$173Southwest

Find Deal

Tue, Sep 16 - Sun, Sep 21

5:30 am - 1:44 pmSEA-STL

6h 14m1 stop

10:40 am - 5:54 pmSTL-SEA

9h 14m1 stop

$177Delta

Find Deal

Sat, Sep 20 - Wed, Oct 1

5:30 am - 1:44 pmSEA-STL

6h 14m1 stop

7:00 pm - 11:59 pmSTL-SEA

6h 59m1 stop

$183Delta

Find Deal

Sat, Sep 20 - Mon, Sep 29

12:59 am - 12:37 pmSEA-STL

9h 38m1 stop

5:40 pm - 11:18 pmSTL-SEA

7h 38m1 stop

$197American Airlines

Find Deal

Fri, Nov 7 - Tue, Nov 11

8:43 pm - 9:07 amSEA-STL

10h 24m1 stop

6:33 am - 9:05 amSTL-SEA

4h 32mnonstop

$204

Find Deal

Fri, Oct 10 - Wed, Oct 15

2:31 pm - 9:07 amSEA-STL

16h 36m1 stop

6:33 am - 9:05 amSTL-SEA

4h 32mnonstop

$206

Find Deal

Mon, Oct 20 - Wed, Oct 22

12:59 am - 10:37 amSEA-STL

7h 38m1 stop

4:48 pm - 11:18 pmSTL-SEA

8h 30m1 stop

$223American Airlines

Find Deal

Thu, Nov 6 - Mon, Nov 10

7:00 am - 3:40 pmSEA-STL

6h 40m1 stop

1:35 pm - 9:00 pmSTL-SEA

9h 25m2 stops

$225United Airlines

Find Deal

Thu, Dec 11 - Tue, Dec 16

7:00 am - 3:44 pmPDX-STL

6h 44m1 stop

12:25 pm - 12:28 amSTL-PDX

14h 03m2 stops

$324United Airlines

Find Deal

Sat, Sep 20 - Sat, Sep 27

Frontier flights from State of Washington to St. Louis

Our best Frontier deals on State of Washington to St. Louis flight tickets

Frontier

Oct 24

SEA6:39 pmSeattle/Tacoma Intl

19h 17m

1 stop

STL3:56 pmLambert-St Louis

Oct 26

STL7:52 pmLambert-St Louis

18h 15m

1 stop

SEA12:07 pmSeattle/Tacoma Intl

$169

Find similar

Frontier

Oct 20

SEA2:31 pmSeattle/Tacoma Intl

16h 36m

1 stop

STL9:07 amLambert-St Louis

Oct 22

STL7:52 pmLambert-St Louis

18h 15m

1 stop

SEA12:07 pmSeattle/Tacoma Intl

$175

Find similar

Frontier

Sep 21

SEA6:12 amSeattle/Tacoma Intl

24h 54m

1 stop

STL9:06 amLambert-St Louis

Sep 23

STL7:55 pmLambert-St Louis

29h 04m

1 stop

SEA10:59 pmSeattle/Tacoma Intl

$178

Find similar

Delta flights from State of Washington to St. Louis

Our best Delta deals on State of Washington to St. Louis flight tickets

Delta

Sep 20

SEA5:30 amSeattle/Tacoma Intl

6h 14m

1 stop

STL1:44 pmLambert-St Louis

Oct 1

STL10:40 amLambert-St Louis

9h 14m

1 stop

SEA5:54 pmSeattle/Tacoma Intl

$177

Find similar

Delta

Sep 20

SEA5:30 amSeattle/Tacoma Intl

6h 14m

1 stop

STL1:44 pmLambert-St Louis

Sep 29

STL7:00 pmLambert-St Louis

6h 59m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

$183

Find similar

Delta

Sep 26

SEA11:40 pmSeattle/Tacoma Intl

6h 57m

1 stop

STL8:37 amLambert-St Louis

Sep 29

STL7:00 pmLambert-St Louis

6h 59m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

$189

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 10/24

6:39 pm-3:56 pm

1 stop19h 17m

Lambert-St Louis

Sun 10/26

7:52 pm-12:07 pm

1 stop18h 15m

$169

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 9/16

11:10 pm-10:15 am

1 stop9h 05m

Lambert-St Louis

Sun 9/21

11:10 am-1:30 pm

Nonstop4h 20m

$173

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 9/20

5:30 am-1:44 pm

1 stop6h 14m

Lambert-St Louis

Wed 10/1

10:40 am-5:54 pm

1 stop9h 14m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sat 9/20

5:30 am-1:44 pm

1 stop6h 14m

Lambert-St Louis

Mon 9/29

7:00 pm-11:59 pm

1 stop6h 59m

$183

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 11/7

12:59 am-12:37 pm

1 stop9h 38m

Lambert-St Louis

Tue 11/11

5:40 pm-11:18 pm

1 stop7h 38m

$197

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Fri 10/10

8:43 pm-9:07 am

1 stop10h 24m

Lambert-St Louis

Wed 10/15

6:33 am-9:05 am

Nonstop4h 32m

$204

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 10/20

2:31 pm-9:07 am

1 stop16h 36m

Lambert-St Louis

Wed 10/22

6:33 am-9:05 am

Nonstop4h 32m

$206

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 11/6

12:59 am-10:37 am

1 stop7h 38m

Lambert-St Louis

Mon 11/10

4:48 pm-11:18 pm

1 stop8h 30m

$223

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Thu 12/11

7:00 am-3:40 pm

1 stop6h 40m

Lambert-St Louis

Tue 12/16

1:35 pm-9:00 pm

2 stops9h 25m

$225

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Sat 9/20

7:00 am-3:44 pm

1 stop6h 44m

Lambert-St Louis

Sat 9/27

12:25 pm-12:28 am

2 stops14h 03m

$324

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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

Prices

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What is the cheapest month to fly to St. Louis?

In general, September 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 $316. The month of October is another great option to travel to St. Louis, with average flight prices from State of Washington averaging around $338.

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 $396. 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 $487. 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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as $267 when looking at flights departing in the evening. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $437 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 $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 State of Washington for as low as $313 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 11% 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	$80
Fastest flight time	3h 54m
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 $80. The best round-trip flight deal from State of Washington to St. Louis found on momondo in the last 72 hours is $169.

The fastest flight from State of Washington to St. Louis takes 3h 54m

Direct flights go from State of Washington to St. Louis every day.

There is 1 airport near St. Louis: 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?
As of August 2025, there are 7 operators available to choose from 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?
momondo data reveals that the most frequently booked plane model on the route from State of Washington to St. Louis is Boeing 737, representing 35.97% of all bookings. The subsequent popular models are Boeing 737 MAX 9 at 27.38%, Boeing 737-900 Passenger/BBJ3 (winglets) at 15.38%, and Boeing 737-700 Passenger/BBJ1 (winglets) at 9.73%.

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
Frontier	PriceFrom $134	Free Cancellation	Rating 5.8 3,212 reviews	Search Frontier flights
Delta	PriceFrom $178	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $188	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights
United Airlines	PriceFrom $216	Free Cancellation	Rating 7.4 8,925 reviews	Search United Airlines flights
Hawaiian Airlines	PriceFrom $227	Free Cancellation	Rating 7.8 2,664 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $236	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights

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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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Cheap flights from Washington to St. Louis from $80

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 10/10. 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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Frontier flights from State of Washington to St. Louis

Our best Frontier deals on State of Washington to St. Louis flight tickets

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Our best Delta deals on State of Washington to St. Louis flight tickets

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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?

What is the cheapest day to depart on your flight to St. Louis?

What is the cheapest time of day to depart on your flight to St. Louis?

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?

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 11% on your flight if you consider stops on a State of Washington to St. Louis flight.

What is the cheapest airline that flies from Washington to Lambert-St Louis?

Frontier, United Airlines, and Southwest are the most popular carriers operating from Washington to Lambert-St Louis

What airlines fly to St. Louis?

How many flights depart from State of Washington to St. Louis on average per day?

The number of flights available between State of Washington and St. Louis is 9 per day as of August 2025. The most frequent departure time is 6:00PM, with 39% of daily flights leaving in the evening.

How many flights depart from State of Washington to St. Louis on average per week?

The number of flights available between State of Washington and St. Louis is 63 per week as of August 2025. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.

How long does it take to fly to St. Louis?

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

Fastest flight time

Direct flights

Airports in St. Louis

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

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?

What documentation or ID do you need to fly to Lambert-St Louis Airport?

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

Traveling to a place near St. Louis?

Why use momondo?

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

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

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

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

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

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