Cheap Flights from St. Louis to Seattle from $96

Frequently Asked Questions

• What are the cheapest flights from St. Louis to Seattle (STL-SEA)?

  Based on Trip.com data, Delta Air Lines offers one-way fares as low as $96 on Cheapest nonstop routes (e.g. STL to SEA on Sat, Aug 1), while Frontier Airlines offers Cheapest nonstop round-trips from $265 departing on Wed, Jun 17 and returning on Wed, Jun 24.

• Which airlines offer direct flights from St. Louis to Seattle?

  At the moment, you can catch a nonstop flight from St. Louis to Seattle with the following airlines, including: Alaska Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long does it take to fly from St. Louis (STL) to Seattle (SEA) and what is the distance?

  It takes around 4 hours 34 minutes to fly from St. Louis (STL) to Seattle (SEA).

• When is the best time to book flights from St. Louis to Seattle?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from St. Louis to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from St. Louis to Seattle?

  Based on Trip.com data in the past 4 weeks, there is 38 flight per week flying from St. Louis to Seattle. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS473 (06:10)

• How can I find the best deals on flights from St. Louis to Seattle?

  To find best deals on flights from St. Louis to Seattle, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, Aug 1, with one-way flights priced at just $96.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Seattle travel is around January.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from St. Louis (STL) to Seattle (SEA) the cheapest?

  The cheapest months to fly from St. Louis to Seattle is November, when demand for travel is lower.

• Which upcoming date is cheapest to fly from St. Louis to Seattle on?

  After crunching the numbers on our June flight calendar, it's currently cheapest to fly from St. Louis to Seattle on June 16, 2026 with Frontier Airlines, with prices starting at $265.

• Which airports can I fly to for Seattle from St. Louis?

  You can land at any one of the following hubs in Seattle, with St. Louis Lambert International Airport to Seattle-Tacoma International Airport (STL-SEA) is by far the most common option on this route: Seattle-Tacoma International Airport (SEA) King County (Boeing Field) International Airport (BFI) Kenmore Air Harbor Seaplane Base (LKE).

• Is there any time difference between St. Louis and Seattle?

  The time difference between Seattle and St. Louis is 2h.

• How do I change or cancel my ticket from St. Louis to Seattle?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.