STL - SEA

$72 Find Cheap Flights from St. Louis to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Seattle departing on 4/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Seattle.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Seattle.
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Everything you should know

Cheapest round-trip
$204
Overall average: $282
Frontier
Mon 4/20Fri 4/24
STL - SEA • 2 stops
Cheapest non-stop
$205
Typical prices: $257-$407
Hawaiian Airlines
Sat 4/4Sat 4/11
STL - SEA • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Avoid peak hours at STL to reduce security wait times.
Use the Link light rail from SEA for a smooth downtown trip.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $204 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Alaska Airlines. Average duration is 4h 34m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $208 (round-trip)
Shortest trip • 6h 43m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 43% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
+1
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+1
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We hope you love your trip to Seattle!
Flight Deals
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Flight Deals

Cheap Flights from St. Louis to Seattle (STL-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Seattle

Mon, Apr 20 - Fri, Apr 24
Frontier Logo
9:55 pm - 9:27 am
STL
-
SEA
13h 32m
2 stops
Frontier Logo
7:12 pm - 7:32 pm
SEA
-
STL
22h 20m
1 stop
$204Frontier
Sat, Apr 4 - Sat, Apr 11
Hawaiian Airlines Logo
7:00 am - 9:35 am
STL
-
SEA
4h 35mnonstop
Hawaiian Airlines Logo
6:02 pm - 11:59 pm
SEA
-
STL
3h 57mnonstop
$205Hawaiian Airlines
Wed, Apr 8 - Sat, Apr 11
Hawaiian Airlines Logo
7:00 am - 9:35 am
STL
-
SEA
4h 35mnonstop
Hawaiian Airlines Logo
6:02 pm - 11:59 pm
SEA
-
STL
3h 57mnonstop
$206Hawaiian Airlines
Mon, Apr 20 - Wed, Apr 22
Frontier Logo
8:17 pm - 9:27 am
STL
-
SEA
15h 10m
1 stop
Frontier Logo
7:12 pm - 7:21 pm
SEA
-
STL
22h 09m
1 stop
$208Frontier
Thu, Apr 23 - Sun, Apr 26
Frontier Logo
8:06 pm - 9:52 am
STL
-
SEA
15h 46m
1 stop
Frontier Logo
7:12 pm - 7:32 pm
SEA
-
STL
22h 20m
1 stop
$210Frontier
Fri, Apr 3 - Mon, Apr 13
Frontier Logo
8:16 pm - 11:37 am
STL
-
SEA
17h 21m
1 stop
Frontier Logo
10:09 pm - 6:50 am
SEA
-
STL
30h 41m
2 stops
$213Frontier
Wed, May 13 - Wed, May 20
Alaska Airlines Logo
7:41 pm - 10:11 pm
STL
-
SEA
4h 30mnonstop
Alaska Airlines Logo
9:17 am - 3:16 pm
SEA
-
STL
3h 59mnonstop
$215Alaska Airlines
Tue, Apr 7 - Sat, Apr 11
Alaska Airlines Logo
3:50 pm - 6:23 pm
STL
-
SEA
4h 33mnonstop
Alaska Airlines Logo
6:02 pm - 11:59 pm
SEA
-
STL
3h 57mnonstop
$217Alaska Airlines
Thu, Apr 23 - Sun, Apr 26
Frontier Logo
9:55 pm - 9:52 am
STL
-
SEA
13h 57m
2 stops
Frontier Logo
7:12 pm - 7:32 pm
SEA
-
STL
22h 20m
1 stop
$219Frontier
Fri, May 8 - Sat, May 16
Frontier Logo
8:08 pm - 9:49 am
STL
-
SEA
15h 41m
1 stop
Frontier Logo
11:37 am - 11:21 am
SEA
-
STL
21h 44m
1 stop
$221Frontier
Booking Insights

KAYAK's insights & trends for St. Louis to Seattle flights

Get data-powered insights and trends into flights from St. Louis to Seattle to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Seattle?

The average price of all round-trip flights from St. Louis to Seattle clicked on KAYAK for each day over the last 12 months.

For St. Louis to Seattle, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle back to St. Louis, the best deals are generally found on Tuesday, with Monday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Seattle is February, where tickets cost $237 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $418 and $389 respectively.

Can I save money by flying with a layover from St. Louis to Seattle?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $302 on average.

How far in advance should I book a flight from St. Louis to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Seattle, you should book around 4 weeks before departure, which saves you about 43% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Expert advice

Expert advice for your flight from St. Louis to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Harriet Baskas

Harriet Baskas

Expert on SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$72
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 31% increase in price.
Flight from St. Louis to Seattle

When to book flights from St. Louis to Seattle

Are your dates flexible? Find out the best times to travel from St. Louis to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Seattle

  • How far is downtown Seattle from Seattle Tacoma International Airport?

    Downtown Seattle is about 15 miles away from the airport. There are multiple ways to get there, although they all vary in cost, speed, and convenience. For instance, the fastest way to downtown Seattle would be by taking a taxi. They can easily be found on the third floor of the parking garage and take less than 25min. Alternatively, you can opt for public transport, which is significantly cheaper but slower than a taxi. To board your train, just head to the bridge on the fourth floor of the parking garage where the terminal is located.

  • Does Seattle Tacoma Airport offer wheelchair services?

    Seattle Airport offers complimentary wheelchair services to aid travelers in getting from the plane to baggage claim to the ground transportation center with ease. However, due to logistics reasons, the airport mainly works with the airlines to provide these services. Therefore, the best way to get wheelchair assistance would be by booking with your airline, which will then put on a note on your reservation record informing the airport that you require special assistance.

  • Is on-site parking available at St. Louis Lambert International Airport?

    St. Louis Lambert Airport has plenty of on-site parking options. Two are specially dedicated for long-term parking. They include Long-Term Parking Lot B and Long-Term Parking Lot C, which is split into a covered and uncovered section. Long-Term Parking Lot B is located past Daily Parking Lot A east of the terminal, while Parking Lot C is situated southwest of the airport.

  • Which airline has a lounge in St Louis Lambert Airport?

    St. Louis Lambert Airport has about four lounges for guests to hang out and relax while waiting for their boarding call. The American Airlines Admirals Club is located Airside on Terminal 1 near Gate C1. The Wingtips Lounge, which is open to all travelers regardless of the airline, is located in Terminal 2 near Gate E22. Here you can find a range of snacks and beverages as well as a TV, charging stations, and Wi-Fi in case you need to send a few emails before boarding your flight.

  • What is the cheapest flight from St. Louis to Seattle?

    In the last 3 days, the lowest price for a flight from St. Louis to Seattle was $72 for a one-way ticket and $204 for a round-trip.

  • Do I need a passport to fly between St. Louis and Seattle?

    No

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to Seattle?

    All the following airlines offer inflight Wi-Fi service on the St. Louis to Seattle flight route: Alaska Airlines, American Airlines, Delta, United Airlines, Lufthansa, and Hawaiian Airlines.

  • Which aircraft models fly most regularly from St. Louis to Seattle?

    The Boeing 737 is the aircraft model that flies most regularly on the St. Louis to Seattle flight route.

  • Which airline alliances offer flights from St. Louis to Seattle?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between St. Louis and Seattle, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from St. Louis to Seattle?

    There are nonstop flights from St. Louis to Seattle on a daily basis.

  • Which is the best airline for flights from St. Louis to Seattle, Southwest or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Seattle are Southwest and Alaska Airlines. With an average price for the route of $355 and an overall rating of 8.0, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $356 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from St. Louis to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $194 or less one-way and $300 or less round-trip.
  • If you’re looking for a way to cut down on the cost of tickets, consider booking connecting flights instead of a direct one. More often than not, airlines will charge lower prices for connecting flights on the same route.
  • While booking your flight, pay close attention to the in-flight services provided. This is because different flights will have varying services available even when they are facilitated by the same airline.
  • If you’re traveling with the kids, you’ll be happy to learn that Seattle Tacoma International Airport (SEA) has a child play area where the kids can play around as you clear with baggage claim. It is located on Concourse D next to Qdoba.
  • St Louis Lambert International Airport (STL) is a pet-friendly airport. If you’re traveling with a service animal or pet, there are multiple relief areas for the four-legged friends. You’ll find two on Concourse E close to Gate E4 while the other one is found on Concourse C near Gate C24.
  • If you need a private space to nurse your child at Seattle Airport, you should check out the nursing pods on Concourse A, near Gate A10E.

Prefer to fly direct from St. Louis to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to Seattle/Tacoma Intl.
Find which airlines fly direct from Lambert-St Louis Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to Seattle/Tacoma Intl

Monday

Alaska Airlines

Alaska Airlines

Tuesday

Alaska Airlines

Alaska Airlines

Wednesday

Alaska Airlines

Alaska Airlines

Thursday

Alaska Airlines

Alaska Airlines

Friday

Alaska Airlines

Alaska Airlines

Saturday

Alaska Airlines

Alaska Airlines

Sunday

Alaska Airlines

Alaska Airlines

See more direct flights

Direct returns

Seattle/Tacoma Intl to Lambert-St Louis

Monday

Alaska Airlines

Alaska Airlines

Tuesday

Alaska Airlines

Alaska Airlines

Wednesday

Alaska Airlines

Alaska Airlines

Thursday

Alaska Airlines

Alaska Airlines

Friday

Alaska Airlines

Alaska Airlines

Saturday

Alaska Airlines

Alaska Airlines

Sunday

Alaska Airlines

Alaska Airlines

See more direct flights

Reviews of the top 5 airlines serving from St. Louis to Seattle

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4321 reviews
8.1Boarding
7.0Food
8.6Crew
7.5Entertainment
8.0Comfort
Airline reviews

We had a 5 hour delay on the tarmac in Baltimore

2.0 MediocreDavid, Mar 2026
ALB - BWI
Read more Southwest reviews

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

I realize they are still working out kinks with the new boarding process, but by the time I boarded in group 5, most of the bins were full. All airlines should better enforce small bags and jackets going under the seats until everyone has boarded.

WiFi was not working and didn’t have a beverage service

Snacks are always pretzels. Why can't you also offer peanuts ?

They changed the flight time from 4:00 to 1:50. We missed the flight because we did not know. We were not entitled to any sort of refund.

After landing in Seattle, 3 hours waiting to find parking space do to driving problems. Very uncomfortable.

Snacks for our toddler could have been better, front the standpoint of variety but that’s not any different from other airlines.

Never got on because first part of trip was cancelled and we have no idea when we will get rebooked…

They cancelled the flight and provided no support to find another way home or how to get a refund. Links provided didn’t work and phone wait times were over eight hours. Battery on my phone couldn’t last long enough.

signage from the upper area to the tram down 2 escalator!

The WiFi worked for entertainment but a nearly 4 hour flight should have personal tvs

Generally very good. Waiting (due to de-icing and traffic) in plane to take off was a put-off. But it's not the airline's fault. I find Airbus more comfortable than Boeing.

Lot's of good food and free entanglement made the trip pleasurable and fun.

The food was terrible, worse that what you get with UA, an already one of the lowest standards to beat. How cheap one could be, providing that kind of junk food in first class. Unbelievable! The seats were not very comfortable either. And there were no screens either, not that I cared much but for you to know.

Perhaps when you’re sitting in 1st class and the crew closes the bathroom for the pilots, there could be a notification other than holding your hands up as a blockade when you get there and you’re told the restrooms are closed please turn around … especially at night when visibility is poor and you’re met by a flight attendants with their arms up

First class is comfortable. Enjoyed a movie and was able to relax compared to coach.

Loved flying First Class. Very comfortable. The seat was amazing. Enjoyed a movie and was able to relax so much better than in coach.

Everything was good except wifi and a leaking drink chiller. The floor was all wet and my bag was soaked. Did not notice until debarking. Have not heard back from Delta. Even though this was leg one of an international flight in first class, they denied access to their Sky Club - very disappointing!

Delta has too many delays now days. It is 1:06 am now. I was supposed to land in Norfolk at 10:30 pm. I got re-booked through Detroit and I’m still in Detroit. I hope to be landed in Norfolk by 3am. I’ve been in airports for 12 hours as of right now. There is a weather delay now but most delays lately have been maintenance.

This is the first time I've been disappointed with Delta. I was called by Delta to see if I would volunteer to change flights since my original flight home was overbooked. I accepted. The modified booking only provided me a 35 minute layover - when you subtract the fact that boarding closes for a flight 15 minutes early, that gave me 20 minutes to run for one end of the airport to the other. I barely made it. On the 2.5 hour flight to Tampa, the crew repeatedly let us know over the intercom that they cannot serve drinks or snacks due to safety/turbulence. I would have accepted this reason if they did not CONTINUALLY SERVE DRINKS AND COOKED FOOD to First class. If safety is the excuse then the entire plane should be strapped in for safety. On top of this the air conditioning vents were not working correctly and the plane was uncomfortably warm. I love Delta and am a loyal Delta traveler, and I have never had an experience like this. I don't know if there's a disconnect between availability among third-party sites like KAYAK and the airlines or what, but when overbooking causes issues like this for travelers it should be reviewed and changes to the booking process should be made. I blame BOTH KAYAK and Delta for this terrible experience.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

Staff was great! Kind and cordial! Middle seat row 28 seat B has a hump in it. Trays were getting stuck when putting down and up. Good flight

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Fabulous if you have a portable wheelchair. They can store it in the galley and you can just walk out with it. Really nice and the flat seats are just incredible, very nice. iPads for movies, also pretty nice,

The crew were exceptionally nice and accommodating. My wife was tired after the flight from Haneda, Tokyo. They let her sleep and served her dinner later after she woke up, before we landed in PDX.

No charging outlets worked. Other than collecting trash attendants didn’t come around. No one could hear flight attendants announcements during the flight. Seat pads were horrible. Sitting on a board for 5 hours. What happened to Hawaiian airlines comfort, hospitality, and extras? Our pilots did an excellent job trying to minimize turbulence and incredible job in landing in windy conditions.

I like that if they asked you to checked in a bag at the gate they give you priority to board

Horrible food and crew. Crew were laughing and talking loud while people were trying to sleep

Yall need to integrate your system with Alaska more efficiently. They booted me off the first flight because of a discrepancy on your end.

The crew at Hawaiian Airlines was fantastic. Kind and hard working. The pilots were great with giving us all the updates to make sure we were informed.

Very good. Nice plane and we sat in economy plus - bigger seats, more room. They served a meal and snacks, and the meal was an apple stuffed pancake that was very good! The snack for us was a hummus sandwich - also very good. The flight attendants were helpful and nice. They have plenty of movies and shows to watch. My only negative -- they changed our flights around and did not adjust the layovers, so we ended up with a very long and unnecessary layover in Honolulu.

I liked the Starlink WiFi but didn't like how they said they were the only airline to offer a free meal and it turns out to be just a standalone sandwich and then charge for snacks to go with it. Rather have the free snacks like Southwest, but have the option to purchase a decent meal for a 5+ hour flight.

Flight scheduled to take off at 5.55pm but it did not take off until 7pm due to some food delivery delay.

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

After changing the departure gate 5 times making us mo e from one side of the airport to the other and then back the flight was delayed nearly 2 hours. The male flight attendant had a bad attitude with the guest being condescending, disrespectful with people who were already on edge.

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

It would have been nice if American tried to care.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

I booked 1st class, my flights were changed and I was sitting in the middle at the back of the plane. A far cry from the 1st class I purchased for my flights. I am grateful I arrived on time.

There was no beverage service and the only time I saw a crew member walk through the cabin is when we were preparing to land.

Our flight was delayed 3 times and this is why I am giving such low reviews. Everything else was okay but being in the airport at 4:30pm for my initial flight at 7pm to not leave until after 9:30pm is insane,

Flights were constantly delayed. CRW took 50 minutes to get bags

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Everything you need to know for your flight from St. Louis to Seattle

Information on your arrival and departure airports