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Cheap flights from Seattle to St. Louis from $100

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to St. Louis departing on 4/21. 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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Cheap Seattle to St. Louis (SEA to STL) flight deals and tips

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

Best Price Found

$100

Fastest flight time

3h 49m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Seattle in the past 72 hours is $100. The best round-trip flight deal from Seattle to St. Louis found on momondo in the last 72 hours is $164.
The fastest flight from Seattle to St. Louis takes 3h 49m
Direct flights go from Seattle to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

How to get the cheapest flight ticket from Seattle 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 from Seattle to St. Louis?

September. The cheapest time of year to fly to St. Louis from Seattle is September. Most expensive is June

What is the cheapest day to depart Seattle for St. Louis?

Tuesday. The cheapest day of the week is typically Tuesday. The most expensive is typically Monday

When is the cheapest time to fly from Seattle to St. Louis?

In the evening. Seattle to St. Louis flights are approximately 26% more expensive at noon than in the evening

What is the cheapest airline that flies to St. Louis from Seattle?

Frontier. Alaska Airlines, American Airlines, and Delta are the most popular carriers operating from Seattle to St. Louis

What is the cheapest Seattle to St. Louis flight route?

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

How far in advance should you book Seattle to St. Louis flights?

50 days before. The cheapest time to buy a flight from Seattle to St. Louis is approximately 50 days to departure

How many flights depart from Seattle to St. Louis on average per day?

As of March 2024, 6 flights take off from Seattle and land in St. Louis each day. The most common flight departure time for this route is 5:00PM, with 70% of daily flights taking off in the afternoon.

How many flights depart from Seattle to St. Louis on average per week?

44 flights are operational weekly from Seattle to St. Louis as of March 2024. The most popular departure day for this route is Sunday, with 20% of flights per week taking off on this day.

Can stopping save me money on Seattle to St. Louis flights?

You could potentially save up to 29% on your flight if you consider stops on a Seattle to St. Louis flight.

When you’re planning your trip from Seattle to St. Louis, the most popular airport-to-airport route is Seattle/Tacoma Intl Airport to Lambert-St Louis Airport. If you are looking for an alternate airport to fly into near Lambert-St Louis Airport, Springfield Capital Airport is a great option and is located in Springfield. The least expensive flight option from Seattle to St. Louis will typically be SEA — STL during the month of March with an average price of $164 RT.

Seattle/Tacoma Intl Airport (SEA) to Lambert-St Louis Airport (STL)$164
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Seattle/Tacoma Intl Airport (SEA) to Springfield Capital Airport (SPI)$961
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Easily compare round-trip flights from Seattle to St. Louis

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Seattle to St. Louis by changing tabs
Multiple Airlines
Apr 16
SEA9:35 pmSeattle/Tacoma Intl
10h 12m
1 stop
STL9:47 amLambert-St Louis
Apr 23
STL7:51 pmLambert-St Louis
14h 54m
1 stop
SEA8:45 amSeattle/Tacoma Intl
Frontier
Apr 15
SEA9:00 pmSeattle/Tacoma Intl
11h 18m
1 stop
STL10:18 amLambert-St Louis
Apr 18
STL10:56 pmLambert-St Louis
22h 34m
1 stop
SEA7:30 pmSeattle/Tacoma Intl
American Airlines
Apr 19
SEA12:59 amSeattle/Tacoma Intl
7h 37m
1 stop
STL10:36 amLambert-St Louis
Apr 23
STL11:07 amLambert-St Louis
9h 57m
1 stop
SEA7:04 pmSeattle/Tacoma Intl
Delta
May 30
SEA5:09 pmSeattle/Tacoma Intl
5h 37m
1 stop
STL12:46 amLambert-St Louis
Jun 4
STL5:30 pmLambert-St Louis
6h 51m
1 stop
SEA10:21 pmSeattle/Tacoma Intl
Alaska Airlines
Apr 20
SEA7:24 amSeattle/Tacoma Intl
3h 59m
STL1:23 pmLambert-St Louis
Apr 23
STL2:35 pmLambert-St Louis
4h 25m
SEA5:00 pmSeattle/Tacoma Intl
Spirit Airlines
Apr 11
SEA9:19 pmSeattle/Tacoma Intl
14h 39m
1 stop
STL1:58 pmLambert-St Louis
Apr 16
STL2:35 pmLambert-St Louis
31h 54m
3 stops
SEA8:29 pmSeattle/Tacoma Intl

Find the cheapest one-way flights from Seattle to St. Louis

If you're looking for one-way flights from Seattle to St. Louis, view some of our deals below provided by Alaska Airlines, American Airlines and Delta
Frontier
Apr 21
SEA9:20 pmSeattle/Tacoma Intl
10h 58m
1 stop
STL10:18 amLambert-St Louis
American Airlines
Apr 10
SEA6:00 amSeattle/Tacoma Intl
10h 02m
1 stop
STL6:02 pmLambert-St Louis
Delta
Apr 9
SEA12:35 amSeattle/Tacoma Intl
8h 16m
1 stop
STL10:51 amLambert-St Louis

Search last-minute flights to St. Louis from Seattle

Find and compare round-trip flight prices for your last-minute flight from Seattle to St. Louis
Frontier
Apr 7
SEA12:50 amSeattle/Tacoma Intl
7h 22m
1 stop
STL10:12 amLambert-St Louis
Apr 15
STL8:04 pmLambert-St Louis
26h 31m
1 stop
SEA8:35 pmSeattle/Tacoma Intl
American Airlines
Apr 2
SEA10:31 pmSeattle/Tacoma Intl
7h 56m
1 stop
STL8:27 amLambert-St Louis
Apr 6
STL5:15 amLambert-St Louis
9h 23m
1 stop
SEA12:38 pmSeattle/Tacoma Intl
Multiple Airlines
Apr 3
SEA9:54 pmSeattle/Tacoma Intl
22h 21m
1 stop
STL10:15 pmLambert-St Louis
Apr 7
STL7:37 pmLambert-St Louis
15h 14m
1 stop
SEA8:51 amSeattle/Tacoma Intl
Delta
Apr 2
SEA3:28 pmSeattle/Tacoma Intl
6h 04m
1 stop
STL11:32 pmLambert-St Louis
Apr 15
STL6:50 pmLambert-St Louis
7h 44m
1 stop
SEA12:34 amSeattle/Tacoma Intl
Spirit Airlines
Apr 2
SEA9:41 amSeattle/Tacoma Intl
32h 32m
2 stops
STL8:13 pmLambert-St Louis
Apr 15
STL5:02 pmLambert-St Louis
17h 43m
1 stop
SEA8:45 amSeattle/Tacoma Intl
Alaska Airlines
Apr 4
SEA7:28 amSeattle/Tacoma Intl
3h 58m
STL1:26 pmLambert-St Louis
Apr 12
STL7:00 amLambert-St Louis
4h 30m
SEA9:30 amSeattle/Tacoma Intl

Best airlines flying from Seattle to St. Louis

Compare and see reviews for airlines that fly from Seattle to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $103Free CancellationRating
6.3
4,263 reviews
Search Frontier flights
DeltaPriceFrom $133Free CancellationRating
8.0
11,402 reviews
Search Delta flights
Spirit AirlinesPriceFrom $157Free CancellationRating
6.4
8,843 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $157Free CancellationRating
7.3
15,181 reviews
Search American Airlines flights
United AirlinesPriceFrom $162Free CancellationRating
7.4
11,481 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $171Free CancellationRating
8.1
9,127 reviews
Search Alaska Airlines flights
  • Alaska Airlines Flights From Seattle to St. Louis

    Alaska Airlines is one of the most popular airlines flying from Seattle to St. Louis, operating 11 flights/week on average for this route. A good Alaska Airlines flight deal for Seattle to St. Louis starts from $171 round-trip, up to an average price of $367. Our users have rated Alaska Airlines at 8.1/10.

  • American Airlines Flights From Seattle to St. Louis

    $157 is the best American Airlines flight deal from Seattle to St. Louis found on momondo over the last 72 hours. The average American Airlines ticket price found was closer to $476, however, with flight time and availability significantly affecting the price. American Airlines (7.3/10 from 15,181 user reviews) flies into St. Louis from Seattle 13 times in an average week so prices can vary.


American Airlines flights from Seattle to St. Louis

Our best American Airlines deals on Seattle to St. Louis flight tickets
American Airlines
Apr 19
SEA12:59 amSeattle/Tacoma Intl
7h 37m
1 stop
STL10:36 amLambert-St Louis
Apr 23
STL11:07 amLambert-St Louis
9h 57m
1 stop
SEA7:04 pmSeattle/Tacoma Intl
American Airlines
May 1
SEA5:00 amSeattle/Tacoma Intl
6h 47m
1 stop
STL1:47 pmLambert-St Louis
May 7
STL5:08 pmLambert-St Louis
7h 57m
1 stop
SEA11:05 pmSeattle/Tacoma Intl
American Airlines
Apr 15
SEA12:59 amSeattle/Tacoma Intl
7h 37m
1 stop
STL10:36 amLambert-St Louis
Apr 23
STL11:07 amLambert-St Louis
9h 57m
1 stop
SEA7:04 pmSeattle/Tacoma Intl

Frontier flights from Seattle to St. Louis

Our best Frontier deals on Seattle to St. Louis flight tickets
Frontier
Apr 15
SEA9:00 pmSeattle/Tacoma Intl
11h 18m
1 stop
STL10:18 amLambert-St Louis
Apr 18
STL10:56 pmLambert-St Louis
22h 34m
1 stop
SEA7:30 pmSeattle/Tacoma Intl
Frontier
Apr 22
SEA9:00 pmSeattle/Tacoma Intl
11h 18m
1 stop
STL10:18 amLambert-St Louis
Apr 26
STL10:17 pmLambert-St Louis
13h 03m
1 stop
SEA9:20 amSeattle/Tacoma Intl
Frontier
May 1
SEA9:55 amSeattle/Tacoma Intl
8h 44m
1 stop
STL8:39 pmLambert-St Louis
May 6
STL9:53 pmLambert-St Louis
13h 51m
1 stop
SEA9:44 amSeattle/Tacoma Intl

  • How far is Seattle/Tacoma Intl to Lambert-St Louis by plane?

    The distance between Seattle/Tacoma Intl and Lambert-St Louis is about 1719.6 mi. Typically, this will take 3h 54m by plane in normal conditions.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Lambert-St Louis Airport?

    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 Seattle/Tacoma Intl Airport to Lambert-St Louis Airport.

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

    The travel and health documents you'll need for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.


Alternative routes for Seattle to St. Louis

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Seattle to Kansas City Flights
Fastest flight time3h 24m
Cheapest price$178
Seattle to Springfield Flights
Fastest flight time6h 44m
Cheapest price$349
Spokane to St. Louis Flights
Fastest flight time4h 54m
Cheapest price$335
Spokane to Kansas City Flights
Fastest flight time5h 12m
Cheapest price$318
Pasco to Kansas City Flights
Fastest flight time5h 05m
Cheapest price$337
Spokane to Springfield Flights
Fastest flight time5h 41m
Cheapest price$610
Bellingham to Kansas City Flights
Fastest flight time13h 04m
Cheapest price$483
Pasco to St. Louis Flights
Fastest flight time13h 16m
Cheapest price$378
Seattle to Joplin Flights
Fastest flight time9h 51m
Cheapest price$384
Pasco to Springfield Flights
Fastest flight time13h 45m
Cheapest price$611
Seattle to Columbia, Missouri Flights
Fastest flight time7h 44m
Cheapest price$570
Bellingham to St. Louis Flights
Fastest flight time8h 26m
Cheapest price$275

Similar Seattle to St. Louis flights

Flexible with your destination? Broaden your search and find flights similar to your Seattle to St. Louis route

Why use momondo?

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

Finding the right flight to St. Louis from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

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

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

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 Seattle to St. Louis.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Seattle and alert you when they change.


An easier way to manage your St. Louis trip

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