What airlines fly to State of Washington?

Alaska Airlines, Delta and American Airlines are the top three most popular airlines that fly to State of Washington from St. Louis according to our data. Alaska Airlines is the first choice among our users, with 63% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 7 different airlines that fly to State of Washington on a routine basis, so you have a few additional options to choose from.

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

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

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

The number of flights available between St. Louis and State of Washington is 5 per day as of February 2026. The most frequent departure time is 2:00PM, with 66% of daily flights leaving in the afternoon.

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

As of February 2026, 39 flights take off from St. Louis and land in State of Washington each week. The most common flight departure day for this route is Thu, with 26% of weekly flights taking off on this day.

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

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

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

As of February 2026, there are 7 operators available to choose from for flights from Lambert-St Louis Airport to Washington.

How old do you have to be to fly from Lambert-St Louis Airport to Washington?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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.

What documentation or ID do you need to fly to Washington?

The travel and health documents you'll need for your trip to Washington may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$66 Cheap Flights from St. Louis to Washington in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

8:12 pm - 9:27 am

STL

SEA

15h 15m

1 stop

6:57 pm - 7:12 pm

SEA

STL

22h 15m

1 stop

$177Frontier

za, apr. 18 - zo, apr. 26

8:12 pm - 9:27 am

STL

SEA

15h 15m

1 stop

10:42 am - 7:12 pm

SEA

STL

30h 30m

2 stops

$185Frontier

za, apr. 18 - wo, apr. 22

7:30 pm - 10:00 pm

STL

SEA

4h 30mnonstop

8:32 am - 2:26 pm

SEA

STL

3h 54mnonstop

$189Alaska Airlines

di, aug. 11 - do, aug. 27

4:30 pm - 12:30 am

STL

SEA

10h 00m

1 stop

7:00 am - 8:09 pm

SEA

STL

11h 09m

1 stop

$202American Airlines

di, apr. 21 - za, apr. 25

6:20 pm - 8:37 pm

STL

PDX

4h 17mnonstop

11:18 am - 5:06 pm

PDX

STL

3h 48mnonstop

$229Alaska Airlines

wo, mei. 13 - ma, mei. 18

5:59 pm - 10:54 pm

STL

PDX

6h 55m

1 stop

7:45 pm - 5:47 am

PDX

STL

8h 02m

1 stop

$244United Airlines

wo, mei. 13 - ma, mei. 18

2:50 pm - 9:18 pm

STL

GEG

8h 28m

1 stop

1:43 pm - 8:54 pm

GEG

STL

5h 11m

1 stop

$277United Airlines

wo, mrt. 25 - wo, apr. 15

2:12 pm - 10:50 pm

STL

GEG

10h 38m

2 stops

7:38 pm - 9:48 am

GEG

STL

12h 10m

2 stops

$286Delta

wo, mrt. 25 - vr, apr. 17

6:29 am - 1:10 pm

STL

GEG

8h 41m

1 stop

6:15 am - 5:26 pm

GEG

STL

9h 11m

2 stops

$301Delta

wo, mrt. 25 - vr, apr. 17

2:37 pm - 7:48 pm

STL

PSC

7h 11m

1 stop

2:12 pm - 12:12 am

PSC

STL

8h 00m

1 stop

$403American Airlines

do, mei. 7 - di, mei. 12

Alaska Airlines flights from St. Louis to State of Washington

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

Alaska Airlines

Aug 11

STL7:30 pmLambert-St Louis

4h 30m

SEA10:00 pmSeattle/Tacoma Intl

Aug 27

SEA8:32 amSeattle/Tacoma Intl

3h 54m

STL2:26 pmLambert-St Louis

$189

Alaska Airlines

Apr 21

STL7:00 amLambert-St Louis

4h 35m

SEA9:35 amSeattle/Tacoma Intl

Apr 22

SEA5:57 pmSeattle/Tacoma Intl

4h 02m

STL11:59 pmLambert-St Louis

$217

Alaska Airlines

Apr 1

STL3:50 pmLambert-St Louis

4h 33m

SEA6:23 pmSeattle/Tacoma Intl

Apr 4

SEA6:02 pmSeattle/Tacoma Intl

3h 57m

STL11:59 pmLambert-St Louis

$227

American Airlines flights from St. Louis to State of Washington

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

American Airlines

Apr 21

STL4:30 pmLambert-St Louis

10h 00m

1 stop

SEA12:30 amSeattle/Tacoma Intl

Apr 25

SEA7:00 amSeattle/Tacoma Intl

11h 09m

1 stop

STL8:09 pmLambert-St Louis

$202

American Airlines

Apr 21

STL5:21 pmLambert-St Louis

9h 09m

1 stop

SEA12:30 amSeattle/Tacoma Intl

Apr 22

SEA7:00 amSeattle/Tacoma Intl

7h 41m

1 stop

STL4:41 pmLambert-St Louis

$209

American Airlines

Feb 28

STL6:36 pmLambert-St Louis

7h 48m

1 stop

SEA12:24 amSeattle/Tacoma Intl

Mar 6

SEA12:07 amSeattle/Tacoma Intl

11h 43m

1 stop

STL1:50 pmLambert-St Louis

$216

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

za 4/18

8:12 pm-9:27 am

1 stop15h 15m

Seattle/Tacoma Intl

zo 4/26

6:57 pm-7:12 pm

1 stop22h 15m

$177

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

za 4/18

8:12 pm-9:27 am

1 stop15h 15m

Seattle/Tacoma Intl

wo 4/22

10:42 am-7:12 pm

2 stops30h 30m

$185

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

di 8/11

7:30 pm-10:00 pm

Nonstop4h 30m

Seattle/Tacoma Intl

do 8/27

8:32 am-2:26 pm

Nonstop3h 54m

$189

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

di 4/21

4:30 pm-12:30 am

1 stop10h 00m

Seattle/Tacoma Intl

za 4/25

7:00 am-8:09 pm

1 stop11h 09m

$202

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

wo 5/13

6:20 pm-8:37 pm

Nonstop4h 17m

Portland

ma 5/18

11:18 am-5:06 pm

Nonstop3h 48m

$229

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

wo 5/13

5:59 pm-10:54 pm

1 stop6h 55m

Portland

ma 5/18

7:45 pm-5:47 am

1 stop8h 02m

$244

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

wo 3/25

2:50 pm-9:18 pm

1 stop8h 28m

Spokane

wo 4/15

1:43 pm-8:54 pm

1 stop5h 11m

$277

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

wo 3/25

2:12 pm-10:50 pm

2 stops10h 38m

Spokane

vr 4/17

7:38 pm-9:48 am

2 stops12h 10m

$286

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

wo 3/25

6:29 am-1:10 pm

1 stop8h 41m

Spokane

vr 4/17

6:15 am-5:26 pm

2 stops9h 11m

$301

St. LouisPasco

STL - PSC

STLPSC

Lambert-St Louis

do 5/7

2:37 pm-7:48 pm

1 stop7h 11m

Pasco Tri Cities

di 5/12

2:12 pm-12:12 am

1 stop8h 00m

$403

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 State of Washington

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 cheapest month to fly to State of Washington?

The month of February is, on average, the cheapest month to fly to State of Washington from St. Louis, with most prices found around $242. If you aren’t able to travel to State of Washington during the month of February, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $249.

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from St. Louis to State of Washington is on a Tuesday. Travelers who choose to depart for State of Washington on a Tuesday will often find tickets for as low as $450. 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 State of Washington for around $563.

What is the cheapest time of day to depart on your flight to State of Washington?

The cheapest time of day to fly to State of Washington is in the afternoon when flights can be purchased for as low as $443. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $504 on average. Flights to State of Washington from St. Louis in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

Fly from Lambert-St Louis to Seattle/Tacoma Intl for the best Lambert-St Louis - Washington flight prices

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around $322 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from St. Louis for as low as $277 on momondo.

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

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

No. A direct flight is the cheapest option for a flight between St. Louis to State of Washington.

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

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

Best Price Found	$160
Fastest flight time	4h 10m
Direct flights	Every day
Airports in State of Washington	96 airports

The best one-way flight to State of Washington from St. Louis in the past 72 hours is $160. The best round-trip flight deal from St. Louis to State of Washington found on momondo in the last 72 hours is $292.

The fastest flight from St. Louis to State of Washington takes 4h 10m

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

There are 96 airports in State of Washington. From St. Louis there are direct flights to Portland (PDX), Seattle/Tacoma Intl (SEA).

Search flight deals

When did momondo last update prices for flights from Lambert-St Louis Airport to Washington?
Prices for flights from Lambert-St Louis Airport to Washington refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Washington?
As of February 2026, there are 7 operators available to choose from for flights from Lambert-St Louis Airport to Washington.
How old do you have to be to fly from Lambert-St Louis Airport to Washington?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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.
What documentation or ID do you need to fly to Washington?
The travel and health documents you'll need for your trip to Washington may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to State of Washington?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to State of Washington is Boeing 737 (51.14% of total bookings). The next most popular plane models are Boeing 737-900 Passenger/BBJ3 (winglets) (15.72%), Boeing 737-800 Passenger/BBJ2 (winglets) (13.45%), and Boeing 737 MAX 8 (9.28%).

Best airlines flying from St. Louis to State of Washington

Compare and see reviews for airlines that fly from St. Louis to State of Washington with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $94	Free Cancellation	Rating 7.9 8,205 reviews	Search Delta flights
Frontier	PriceFrom $100	Free Cancellation	Rating 5.7 3,051 reviews	Search Frontier flights
Southwest	PriceFrom $176	Free Cancellation	Rating 8.0 4,286 reviews	Search Southwest flights
American Airlines	PriceFrom $176	Free Cancellation	Rating 7.2 11,296 reviews	Search American Airlines flights
United Airlines	PriceFrom $178	Free Cancellation	Rating 7.4 9,296 reviews	Search United Airlines flights
Hawaiian Airlines	PriceFrom $217	Free Cancellation	Rating 7.8 2,833 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $235	Free Cancellation	Rating 8.0 11,885 reviews	Search Alaska Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington from St. Louis.

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

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

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

Once you have performed a search for St. Louis to Washington 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 St. Louis to Washington right now. Can momondo alert me if prices change?

Price alerts on flights to Washington from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your State of Washington trip

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Cheap flights from St. Louis to Washington from $66

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 departing on 5/9. 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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Alaska Airlines flights from St. Louis to State of Washington

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

American Airlines flights from St. Louis to State of Washington

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

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Washington that are best for you.

See travel insights to Washington from

How to get the cheapest flight ticket from St. Louis to State of Washington

What is the cheapest month to fly to State of Washington?

What is the cheapest day to depart on your flight to State of Washington?

What is the cheapest time of day to depart on your flight to State of Washington?

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

How far in advance should I book a flight to State of Washington?

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

Can stopping save me money on St. Louis to State of Washington flights?

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

What airlines fly to State of Washington?

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

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

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

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

Best Price Found

Fastest flight time

Direct flights

Airports in State of Washington

Best airlines flying from St. Louis to State of Washington

Compare and see reviews for airlines that fly from St. Louis to State of Washington with momondo

Why use momondo?

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

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

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

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

An easier way to manage your State of Washington 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 Washington

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