AED350 Cheap Flights from St. Louis (STL) to Seattle (SEA)

View AED350 flight on Wed, 29 October 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from St. Louis to Seattle (STL-SEA)

Prices were available within the past 7 days and start at AED350 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How long does it take to fly from STL to SEA?
Purchase your ticket with Alaska Airlines and you'll be airborne for roughly 4 hours and 20 minutes. This leading carrier operates a direct flight that sets off at 7:00AM from Lambert-St. Louis Intl. Airport (STL) and reaches Seattle - Tacoma Intl. Airport (SEA) at 9:20AM. Expedia has some of the best deals around, so take a look at what's available on this route today.
Is it cheaper to buy a plane ticket from STL to Sea-Tac Airport last minute?
When it comes to booking your flights, it's better to be prepared. While you could pick up a last-minute deal on a Lambert-St. Louis Intl. Airport (STL) to SEA flight, tickets usually don't get cheaper as the departure date nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to lock in a domestic flight is between 28 – 35 days in advance. For international trips it's between three and four months.
What airports do you fly into for Seattle from St. Louis?
With Seattle - Tacoma Intl. Airport (SEA), Renton Municipal Airport (RNT) and Boeing Field Airport (BFI) to pick from, traveling from St. Louis to Seattle is no sweat. The city's major gateway, Seattle - Tacoma Intl. Airport (SEA), is around 19 kilometers south of the downtown area. Apart from the price of tickets, consider factors like bus or train options from the airport and the distance to your hotel when deciding where to touch down. Get your Seattle adventure off to an awesome start by visiting Space Needle and Pike Place Market.
What are the most popular departure times for flights from STL to Seattle - Tacoma Intl. Airport (SEA)?
Between 2:00 PM - 3:00 PM is when you'll find lots of Alaska Airlines flights departing from STL to Sea-Tac Airport. Want some good advice? Fly out in the morning. With air traffic yet to build up around airports, your chances of catching a delay-free flight are better.
Can I change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Sea-Tac Airport?
It's a cinch to make changes to your STL to SEA trip yourself. Access your itinerary via the Expedia Trips portal and tap "change flight." Look for new flights and lock in the one that fits your new plans. You'll see an estimate of any flight change costs. You can also visit our Customer Service portal to chat to our Virtual Agent and quickly get answers to your questions.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Seattle - Tacoma Intl.
Distance
2728 km
Average flight time
3 hours 2 mins

Book with confidence

Book with confidence

St. Louis to Seattle Flights

Whether you’re looking for a grand adventure or just want to get away for a last-minute break, flights from St. Louis to Seattle offer the perfect respite. Not only does exploring Seattle provide the chance to make some magical memories, dip into delectable dishes, and tour the local landmarks, but the cheap airfare means you won’t bust your budget. So no matter whether your ideal itinerary involves flying one way, non-stop, or round trip, you’re bound to find flights that match your schedule on Expedia, and at prices that won’t shock your wallet.

Bagging a cheap flight from St. Louis to Seattle may mean more dollars to spend on for one-of-a-kind souvenirs when you arrive, but it doesn’t mean you have to skimp on your travel experience, as Expedia offers a sizzling selection of cheap airlines that’ll put you in your happy place on their planes, whether that’s getting lost in a hair-raising airport thriller, dreaming on the passing landscape over a glass of bubbly, or jotting down your vacation bucket list at 38,000 feet. There’s also bound to be plenty of opportunities to snap a few photos of the high life that will make your friends green with envy. After all, enjoying the journey is part of the fun.

With so many affordable flights and so many wonderful adventures awaiting you, there’s no reason to put off booking a fantastic flight from STL to SEA today. So don’t leave it to the last minute to make your dream trip a reality: pack your bags with your go-to travel accessories, put together your list of must-see attractions and can’t-miss activities, and get ready to broaden your horizons – with Expedia, the wonders of Seattle are only a plane trip away. Book your travel arrangements with us today!

If you would like to book flights to Seattle more flexibly many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Seattle is AED350 now!

St. Louis to Seattle Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia