$213 Cheap Flights from Seattle Paine Field Intl. Airport (PAE) to St. Louis (STL)

View $213 flight on Fri, Jul 25, 2025Opens in a new window

Popular airlines from Seattle Paine Field Intl. Airport (PAE) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Seattle Paine Field Intl. Airport to St. Louis (PAE-STL)

Prices were available within the past 7 days and start at $213 for one-way flights and $310 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Sep 12 - Thu, Sep 18
PAE
Seattle
STL
St. Louis
$310 Roundtrip, found 6 days ago
$310
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle to St. Louis, returning Thu, Sep 18, priced at $310 found 6 days ago
Frontier Airlines
Fri, Sep 12 - Sun, Sep 14
PAE
Seattle
STL
St. Louis
$315 Roundtrip, found 6 days ago
$315
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle to St. Louis, returning Sun, Sep 14, priced at $315 found 6 days ago
Frontier Airlines
Thu, Sep 11 - Thu, Sep 18
PAE
Seattle
STL
St. Louis
$321 Roundtrip, found 6 days ago
$321
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Thu, Sep 11 from Seattle to St. Louis, returning Thu, Sep 18, priced at $321 found 6 days ago
Frontier Airlines
Thu, Sep 11 - Sun, Sep 14
PAE
Seattle
STL
St. Louis
$326 Roundtrip, found 1 day ago
$326
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Sep 11 from Seattle to St. Louis, returning Sun, Sep 14, priced at $326 found 1 day ago
Frontier Airlines
Thu, Oct 16 - Sun, Nov 2
PAE
Seattle
STL
St. Louis
$366 Roundtrip, found 3 days ago
$366
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Thu, Oct 16 from Seattle to St. Louis, returning Sun, Nov 2, priced at $366 found 3 days ago
Frontier Airlines
Fri, Sep 12 - Sun, Sep 14
PAE
Seattle
STL
St. Louis
$370 Roundtrip, found 1 day ago
$370
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle to St. Louis, returning Sun, Sep 14, priced at $370 found 1 day ago
Frontier Airlines
Fri, Sep 12 - Sat, Sep 27
PAE
Seattle
STL
St. Louis
$390 Roundtrip, found 6 days ago
$390
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle to St. Louis, returning Sat, Sep 27, priced at $390 found 6 days ago
Frontier Airlines
Fri, Sep 12 - Sat, Sep 13
PAE
Seattle
STL
St. Louis
$400 Roundtrip, found 6 days ago
$400
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle to St. Louis, returning Sat, Sep 13, priced at $400 found 6 days ago
Alaska Airlines
Thu, Sep 11 - Mon, Sep 15
PAE
Seattle
STL
St. Louis
$490 Roundtrip, found 1 day ago
$490
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Sep 11 from Seattle to St. Louis, returning Mon, Sep 15, priced at $490 found 1 day ago
American Airlines
Sat, Aug 30 - Sun, Aug 31
PAE
Seattle
STL
St. Louis
$2,453 Roundtrip, found 6 days ago
$2,453
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Aug 30 from Seattle to St. Louis, returning Sun, Aug 31, priced at $2,453 found 6 days ago
Flights from Seattle Paine Field Intl. Airport (PAE) to St. Louis (STL)
Origin airport
Seattle Paine Field Intl. Airport
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines
Roundtrip price
$310
Distance
1709 mi

Seattle Paine Field Intl. Airport to St. Louis Flights

The cheapest times to fly from Seattle Paine Field Intl. Airport to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle Paine Field Intl. Airport to St. Louis are during the month of September. You can find some of the cheapest flights from Seattle Paine Field Intl. Airport to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle Paine Field Intl. Airport to St. Louis

Sunday is one of the best days to book for cheap flights from Seattle Paine Field Intl. Airport to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle Paine Field Intl. Airport to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle Paine Field Intl. Airport to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $213 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle Paine Field Intl. Airport to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle Paine Field Intl. Airport to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from PAE to STL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from PAE to STL?
The cheapest flights from PAE to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL)?
While Seattle Paine Field Intl. Airport (PAE) doesn't have any direct flights to Lambert-St. Louis Intl. Airport (STL), other airports have nonstop routes. Traveling from Seattle - Tacoma Intl. Airport (SEA) will get you to St. Louis without any layovers.
What is the cheapest airline that flies from PAE to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PAE to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL)?
You'll need to catch a flight with a layover if you're traveling from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from PAE to STL?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can change based on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Flights after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until right before your break to book your flight from PAE to STL often results in higher prices. While you may find some last-minute discounts, there's no guarantee. Be flexible with your itinerary for a better chance of landing a bargain.
Is it cheaper to book a PAE to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a PAE to STL flight and hotel package with Expedia could result in significant savings. What's more, managing everything in one place takes the hassle out of planning your trip. Simply pick your flights and choose from our wide range of stays, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Snohomish County - Paine Field Airport (PAE) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you can reschedule or cancel your PAE to STL flight. However, there may be additional fees, especially if your booking was made over 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you want further details, visit our Customer Service portal.

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*Available to One Key members.