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Cheap flights from St. Louis to Seattle
Round-trip
Economy
Flight information for St. Louis to Seattle
(STL to SEA)
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Seattle
| Best Price Found | $151 | The best flight deal from St. Louis to Seattle found on momondo in the last 72 hours is $151 |
| Fastest flight time | 4h 20m | The fastest flight from St. Louis to Seattle takes 4h 20m |
| Direct flights | Mo, Th and Fr | Direct flights go from St. Louis to Seattle on Monday, Thursday and Friday. The only airline offering direct flights is Alaska Airlines. |
| Airports in Seattle | 3 airports | There are 3 airports near Seattle: Seattle King County/Boeing (BFI), Seattle Lake Union Spb (LKE), Seattle/Tacoma Intl (SEA) |
How to get the cheapest flight ticket from St. Louis to Seattle
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 St. Louis to Seattle?
July
The cheapest time of year to fly to Seattle from St. Louis is July. Most expensive is December
What is the cheapest day to depart St. Louis for Seattle?
Wednesday
The cheapest day of the week is typically Wednesday. The most expensive is typically Sunday
When is the cheapest time to fly from St. Louis to Seattle?
at noon
St. Louis to Seattle flights are approximately 17% more expensive in the morning than at noon
What is the cheapest airline that flies to Seattle from St. Louis?
Major Airline
Major Airline, Sun Country Air, and Frontier are the most popular carriers operating from St. Louis to Seattle
What is the cheapest St. Louis to Seattle flight route?
Lambert-St Louis - Seattle/Tacoma Intl
Fly from Lambert-St Louis to Seattle/Tacoma Intl for the best St. Louis - Seattle flight prices
STL
Lambert-St Louis
SEA
Seattle/Tacoma Intl
How far in advance should you book St. Louis to Seattle flights?
35 days before
The cheapest time to buy a flight from St. Louis to Seattle is approximately 35 days to departure
60
Days before departure
0
Easily compare round-trip flights from St. Louis to Seattle
Below you can see the best fares for your round-trip flight route over the next three months. All fares were found on momondo this week. Browse the quickest and cheapest flights from St. Louis to Seattle by changing tabs
Multiple Airlines![Multiple Airlines]()
Sep 9![Multiple Airlines]()
Sep 12
STL9:43 amLambert-St Louis
7h 22m
1 stop
SEA5:05 pmSeattle/Tacoma Intl
SEA8:49 pmSeattle/Tacoma Intl
7h 32m
1 stop
STL4:21 amLambert-St Louis
Multiple Airlines![Multiple Airlines]()
Aug 25![Multiple Airlines]()
Aug 29
STL9:30 amLambert-St Louis
7h 37m
1 stop
SEA5:07 pmSeattle/Tacoma Intl
SEA8:49 pmSeattle/Tacoma Intl
7h 33m
1 stop
STL4:22 amLambert-St Louis
Find the cheapest one-way flights from St. Louis to Seattle
If you're looking for one-way flights from St. Louis to Seattle, view some of our deals below provided by Spirit Airlines
Best airlines flying from St. Louis to Seattle
Compare and see reviews for airlines that fly from St. Louis to Seattle with momondo
AirlineFree CancellationPrice
PriceFrom $113
Free Cancellation
Reviews
Pros: Everything good
1 / 10
PriceFrom $117
Free Cancellation
Reviews
Cons: Wouldn't let us on the flight when there was plenty of time to get there. Manager was arrogant and slow - didn't care. Poor policies at that airport.
1 / 10
PriceFrom $127
Free Cancellation
Reviews
Pros: Delayed flight no reasons seems like American Airlines don’t know what to do in these situations
Cons: I believe this airlines should have figured the answer to this question by now.
1 / 10
PriceFrom $127
Free Cancellation
Reviews
Pros: Everything! From ticketing agent to all the crew on our flight back were awesome. Thank you!
1 / 10
PriceFrom $134
Free Cancellation
Reviews
Pros: Quick boarding. Inexpensive ticket. Direct flight.
Cons: Crew walked thru cabin at least 5 times collecting garbage, but could not hand out sealed snack or sealed water. People sat should-to-shoulder - No buffer space, but asked to leave the plane with 6 foot intervals???? This airline picks and chooses their Covid precautions. Quick and inexpensive flight, if you don’t mind the rest.
1 / 3
PriceFrom $148
Free Cancellation
Reviews
Pros: The comfort of the plane was great! Lots of room and very comfortable seating.
Cons: I found some members of staff to be a bit rude. When other passengers asked questions or did something wrong (that was a minor issue), one of the staff members in particular talked down to them and treated them like they were stupid.
1 / 10
PriceFrom $266
Free Cancellation
Reviews
Pros: The plane was new and the seats were nice.
1 / 10
Which airlines flying from Lambert-St Louis to Seattle/Tacoma Intl have COVID-19 safety policies in place?
Alaska Airlines has implemented additional safety measures to accommodate travelers. Airlines flying from Lambert-St Louis to Seattle/Tacoma Intl are working to protect travelers. Some of these new policies include temperature checks, pre-flight testing, sanitization of key touchpoints, as well as mask requirements when onboard. Some airlines have even implemented socially distanced seating for a limited time. Policies will vary by airline.
Are airlines flying from Lambert-St Louis to Seattle/Tacoma Intl offering flexible cancellation due to COVID-19?
Due to the global impact of COVID-19, some of our airline partners operating flights from Lambert-St Louis to Seattle/Tacoma Intl, such as Alaska Airlines, United Airlines, and Delta may have put in place flexible cancellation policies. Use our site to search for all of the airlines offering this flexibility to you.
How far is Lambert-St Louis to Seattle/Tacoma Intl by plane?
Lambert-St Louis and Seattle/Tacoma Intl are 1719.6 mi apart from one another. By plane, this route typically takes 4h 28m.
Can I fly to Seattle/Tacoma Intl from Lambert-St Louis right now?
Information is based on travel restrictions for travel to Seattle/Tacoma Intl within the United States
Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter Seattle/Tacoma Intl.
COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Seattle/Tacoma Intl.
Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Seattle/Tacoma Intl.
Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter Seattle/Tacoma Intl.
COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Seattle/Tacoma Intl.
Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Seattle/Tacoma Intl.
Can I fly back to Lambert-St Louis from Seattle/Tacoma Intl?
Returning to Lambert-St Louis from Seattle/Tacoma Intl
COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.
Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Lambert-St Louis.
COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.
Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Lambert-St Louis.