Find The Best Day To Fly from St. Louis to Seattle
Amazing Frontier Airlines STL to SEA Flight Deals
The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $118 round trip and $65 one way. Prices and availability subject to change. Additional terms may apply.
SEA From STL Economy Coach Packages on Similar Airlines
Frequently asked questions
Discover our best Frontier Airlines flight from St. Louis STL to Seattle SEA
To find the best deals on flights to St. Louis from Seattle with Frontier Airlines, just enter your travel dates, filter by Frontier Airlines, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.
Return flights from St. Louis STL to Seattle SEA with Frontier Airlines
If you’re planning a round trip, booking return flights with Frontier Airlines is usually the most cost-effective option. With airfares ranging from $118 to $155, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply.
Book one-way Frontier Airlines flights from St. Louis STL to Seattle SEA
A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way Frontier Airlines flight from St. Louis to Seattle costs from $65. Prices and availability subject to change. Additional terms may apply.
The easy way to find cheap flights to Seattle SEA from St. Louis STL with Frontier Airlines
To find a cheap Frontier Airlines flight from St. Louis STL to Seattle SEA, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference.
How to find our best airfare deals on Frontier Airlines flights from St. Louis STL to Seattle SEA
If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as December, or if you book a flight with a stopover.
Find nonstop flights from St. Louis STL to Seattle SEA with Frontier Airlines
If you’re keen to be on Seattle soil fast, don’t waste time with a stopover—filter your search results to show direct Frontier Airlines flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it.
Flexible airline tickets for Frontier Airlines flights from St. Louis STL to Seattle SEA
Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.
There are a lot of reasons to book your flights to Seattle SEA from St. Louis STL with Frontier Airlines on Travelocity
At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.
Airport code | Country | Airport name | Number of flights |
---|---|---|---|
DEN | USA | Denver Intl. | 13 |
MCO | USA | Orlando Intl. | 7 |
CUN | MEX | Cancun Intl. | 6 |
GDL | MEX | Don Miguel Hidalgo y Costilla Intl. | 5 |
PHL | USA | Philadelphia Intl. | 2 |
ORD | USA | O'Hare Intl. | 2 |
MIA | USA | Miami Intl. | 1 |
LAS | USA | McCarran Intl. | 1 |
MEX | MEX | Mexico City Intl. | 1 |
LAX | USA | Los Angeles Intl. | 1 |
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Popular Frontier Airlines Flight Routes from STL
Top Frontier Airlines Flight Routes from SEA
Domestic
- Dallas to New York (DFW - LGA)
- Newark Liberty Intl. Airport to San Juan (EWR - SJU)
- Dallas to New York (DFW - LGA)
- Philadelphia to Orlando (PHL - MCO)
- Atlanta to New York (ATL - LGA)
- New York to San Juan (JFK - SJU)
- New York to Los Angeles (LGA - LAX)
- San Francisco to New York (SFO - JFK)
- New York to Atlanta (LGA - ATL)
- Dallas to Las Vegas (DFW - LAS)
International
- New York to Orlando (JFK - MCO)
- New York to Orlando (LGA - MCO)
- Atlanta to Newark Liberty Intl. Airport (ATL - EWR)
- New York to San Juan (JFK - SJU)
- Atlanta to New York (ATL - JFK)
- Orlando to New York (MCO - LGA)
- San Francisco to New York (SFO - JFK)
- New York to Atlanta (LGA - ATL)
- Dallas to Las Vegas (DFW - LAS)
- Newark Liberty Intl. Airport to San Juan (EWR - SJU)