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Cheap Flights from St Louis to Seattle

Compare St Louis to Seattle flight deals

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Flight deals from St Louis to Seattle

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Seattle? If you want to travel next month, return fares start from R 3,117. Find the lowest prices on one-way and return tickets right here.
Seattle.R 1,398 per passenger.Departing Mon, 27 Apr.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 27 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 1,398, select.
Seattle.R 1,442 per passenger.Departing Sun, 10 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 10 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 1,442, select.
Seattle.R 1,863 per passenger.Departing Wed, 3 Jun.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 3 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 1,863, select.
Seattle.R 2,088 per passenger.Departing Wed, 8 Jul.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed, 8 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,088, select.
Seattle.R 2,088 per passenger.Departing Tue, 15 Sep.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Tue, 15 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,088, select.
Seattle.R 2,092 per passenger.Departing Tue, 4 Aug.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Tue, 4 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,092, select.
Seattle.R 2,092 per passenger.Departing Wed, 16 Dec.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Wed, 16 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,092, select.
Seattle.R 2,094 per passenger.Departing Fri, 16 Oct.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Fri, 16 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,094, select.
Seattle.R 2,611 per passenger.Departing Sat, 16 May.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Sat, 16 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,611, select.
Seattle.R 2,611 per passenger.Departing Wed, 3 Jun.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Wed, 3 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,611, select.
Seattle.R 2,613 per passenger.Departing Wed, 29 Apr.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Wed, 29 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 2,613, select.
Seattle.R 3,220 per passenger.Departing Tue, 11 Aug.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Tue, 11 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,220, select.
Seattle.R 3,228 per passenger.Departing Mon, 13 Jul.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Mon, 13 Jul, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,228, select.
Seattle.R 3,228 per passenger.Departing Tue, 15 Sep.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Tue, 15 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,228, select.
Seattle.R 3,935 per passenger.Departing Fri, 16 Oct.One-way flight with American Airlines.Outbound direct flight with American Airlines departs from St Louis on Fri, 16 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From R 3,935, select.

Find the cheapest month to fly from St Louis to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Seattle flights are currently cheapest in April.
Apr
from R 1,398
May
from R 1,442
Jun
from R 1,863
Jul
from R 2,088
Aug
from R 2,092
Sep
from R 2,088
Oct
from R 2,094
Nov
Find prices
Dec
from R 2,092
Jan
Find prices
Feb
Find prices
Mar
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Direct flights from St Louis to Seattle

Alternative St Louis to Seattle routes

Looking for the cheapest, fastest or easiest route from St Louis to Seattle? You could fly into the following airports instead.

Seattle Lake Union SPB

2km from central Seattle
Closest
from R 5,120
Search flights

Seattle Boeing Fld

11km from central Seattle
from R 5,407
Search flights

Seattle / Tacoma International

20km from central Seattle
Cheapest
from R 1,398
Search flights

Paine Field

33km from central Seattle
from R 3,591
Search flights

St Louis to Seattle: Flight information

The things to know before you go.
Cheapest flight foundR 1,398
Cheapest month to flyApril
Average flight time4 hrs, 29 mins
Most popular airlineAlaska Airlines
Average flights per week77

Finding cheap flights from St Louis to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from St Louis to Seattle is R 3,117. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
4 hours and 29 minutes is the average flight time from St Louis to Seattle.
Alaska Airlines, American Airlines and Qatar Airways fly direct from St Louis to Seattle.
As of April 2026, there are 77 flights per week flying from St Louis to Seattle.
The cheapest month to fly from St Louis to Seattle is usually May.
If you're flying from St Louis Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from R 3,117.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Seattle on Monday, 4 May 2026.
Yes – the average flight time is 4 hours and 29 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Frontier Airlines and Alaska Airlines offer the cheapest flight tickets to Seattle.

Flying from St Louis Lambert International Airport (STL) to Seattle: what you need to know

  • The average time for a direct flight from St Louis Lambert International Airport to Seattle is 3 hours 55 minutes.

  • Seattle is two hours behind St Louis, where St Louis Lambert International Airport is located. Seattle follows the UTC-8 timezone.

  • St Louis Lambert International Airport (STL) to Seattle-Tacoma International Airport (SEA) is the most traveled route. When booking your flight, you can choose from 16 services every week between STL and SEA.

  • To avoid missing your STL to Seattle flight, leave enough time to navigate the airport and find your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the standard rule.

  • Flying during a popular month such as July? Major public holidays and other high seasons can lead to longer queues at security. Play things extra safe and get there up to four hours before an international flight and two hours before domestic departures.

  • Direct St Louis Lambert International Airport to Seattle tickets are available for booking. Seattle-Tacoma International Airport (SEA) will be your arrival point.

  • Keep an eye out for deals with Alaska Airlines. This carrier operates direct flights from St Louis Lambert International Airport to Seattle.

  • Located around 16 kilometres from the centre of St Louis, STL can be reached in about 25 minutes by car, depending on traffic. The journey on public transport will take roughly 30 minutes.

  • Want an easy start to your travels? Stay near STL. Whether you're boarding an early flight from St Louis Lambert International Airport to Seattle or want to avoid feeling rushed, these hotels have you covered:

  • Of the flights that depart from St Louis Lambert International Airport, 76% arrive as scheduled at their destination.

  • The address for STL is 10701 Lambert International Blvd..

How to find the cheapest flights from St Louis Lambert International Airport (STL) to Seattle

  • The lowest price we've seen for a one-way St Louis Lambert International Airport to Seattle flight is R 1,398. The cheapest price for a return flight is R 3,117. Keep in mind fares may change due to availability at the time of booking.

  • Don't leave everything to the last minute. You're more likely to find cheap flights from STL to Seattle if you book ahead. Airlines often offer some fantastic early bird deals.

  • Scoring cheap tickets from St Louis Lambert International Airport to Seattle is easier if you're flexible with your travel dates. Try using the 'Whole month' search tool to access the best prices across every month and score an awesome deal.

  • There's no need to check back constantly to find out if fares have dropped when you create a Price Alert. We'll let you know when there's an extra saving on cheap flights from STL to Seattle.

  • Save money on your flight from St Louis Lambert International Airport to Seattle with the help of our filters. Choose your ideal times, number of stops and airlines, then sort the results by 'Cheapest' to see the best deals.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is around 23 kilometres from central Seattle. If you're getting a taxi or a ride-share, the drive takes roughly 25 minutes.

  • Getting there by public transport typically takes 35 minutes.

  • If you're coming in on a late flight from St Louis Lambert International Airport to Seattle, few things beat the convenience of staying close to the terminal. Pick up your bags from the carousel and then be showered and sleeping soon after at one of these accommodation options near SEA:

  • Booking your ride from Seattle-Tacoma International Airport around one week in advance of your flight from STL to Seattle can help you get the best possible rate.

Seattle Paine Field International Airport (PAE)

  • Seattle Paine Field International Airport (PAE) is around 40 kilometres from the centre of Seattle. After your flight from St Louis Lambert International Airport to Seattle, it'll take you around 40 minutes to get to the heart of the city in a taxi or ride-share.

  • If you choose to travel on public transport, you'll reach the centre in 1 hour 30 minutes or so.

  • You'll find some comfortable places to call home for the night near PAE. Kick back and get cosy after your STL to Seattle flight at one of these well-located options:

  • Lock in the vehicle you want, not just whatever's left, by securing your ride from PAE ahead of your arrival. You can also avoid paying more than you have to, especially when the airport is busy.

King County International Airport (BFI)

  • Make your way to the city centre after your flight from St Louis Lambert International Airport to Seattle has arrived. Central Seattle is around 11 kilometres from King County International Airport (BFI) and takes roughly 20 minutes to reach by car.

  • The journey will take you about 35 minutes if you use public transport.

  • Enjoy a more leisurely start to your trip by choosing a hotel near BFI after your STL to Seattle flight. Recover from a day of travel or just give yourself time to get your bearings in a new destination at:

  • If you'd like a particular model or make, booking early gives you a better shot at getting exactly what you want. Book your ride from BFI at least a few weeks ahead of your flight from St Louis Lambert International Airport to Seattle.

Best time to go to Seattle

  • It's time to work out your trip dates for your flight from St Louis Lambert International Airport to Seattle. July is the busiest month for a trip to Seattle. If you want a quieter vibe, go in December.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC (54ºF) and 28ºC (82ºF). Lock in your St Louis Lambert International Airport to Seattle plane ticket then if that's your definition of good weather.

  • If you like cooler conditions, look for a cheap ticket from STL to Seattle in February when temperatures average between -1ºC (30ºF) and 11ºC (52ºF).

More about Seattle

  • Start your Seattle trip off on the right foot by choosing the perfect place to stay. Once you've booked your flight from St Louis Lambert International Airport to Seattle, check out our selection of accommodation options including:

  • There are so many things to do and see in this city it can be hard to know where to start. Pike Place Market, Space Needle and Seattle Skyline are top sights which should be on every Seattle itinerary.

Explore more of the United States

  • Seattle has loads to offer, but there are so many other corners of the United States you should also see. Around 241 kilometres south of Seattle, a trip to Portland will keep you busy. Start with leading attractions like Portland Japanese Garden, Peninsula Park Rose Garden and Beyond Van Gogh Portland.

  • Spokane is another essential stop in the United States and is around 370 kilometres east of Seattle. No journey is complete without seeing Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.

Plan the rest of your trip from St Louis to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.