A city skyline with a prominent arch bridge at sunset.

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

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

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Frequently asked questions

How long does it take to fly from SEA to Lambert Field?
A direct flight with Alaska Airlines takes roughly 3 hours and 56 minutes. Take the 6:03PM flight from Seattle - Tacoma Intl. Airport (SEA) and touch down at Lambert-St. Louis Intl. Airport (STL) at 11:59PM. Clinch a top deal on this route when you use Expedia to book your journey.
Is it cheaper to buy a plane ticket from SEA to STL last minute?
Booking your flight from Seattle - Tacoma Intl. Airport (SEA) to Lambert Field at the last minute could save you a tidy sum if you happen to find a bargain. However, tickets typically don't come down in price as the date of departure nears. If you procrastinate, flights could also be booked solid or the best seats taken (because who wants the middle seat?). If you don't want to risk it, book well in advance of when you want to leave. In fact, some of the best deals are available on Expedia up to 12 months in advance. If your favorite carrier hasn't released its airfares yet, check back regularly as offers are constantly updated on Expedia.
What airline has the least delays from Sea-Tac Airport to Lambert Field?
Head off with Alaska Airlines from Seattle - Tacoma Intl. Airport (SEA) to Lambert-St. Louis Intl. Airport (STL) and you're more likely to touch down at the time printed on your ticket. This carrier is the best performer on this route, with 95% of on-time arrivals. If your flight is delayed, the Expedia App is the best way to stay in the loop. Our popular app provides real-time trip notifications, from flight delays to gate changes.
What airports do you fly into for St. Louis from Seattle?
With Lambert-St. Louis Intl. Airport (STL), Spirit of St. Louis Airport (SUS) and St. Louis Downtown Airport (CPS) to choose from, connecting from Seattle to St. Louis is easy. The city's busiest terminal, Lambert-St. Louis Intl. Airport (STL), is about 19 kilometers northwest of the downtown area. As well as the price of tickets, consider factors like bus or train options from the airport and the distance to your hotel when deciding where to fly into. Get your St. Louis adventure off to a flying start by discovering Busch Stadium and Gateway Arch.
What are the most popular departure times for flights from SEA to Lambert Field?
For Alaska Airlines flights jetting out from Sea-Tac Airport to Lambert Field, the most popular departure times are between 7:00 AM - 8:00 AM. If you want to avoid those frustrating delays, fly in the morning. This way you can dodge the heavy air traffic that accumulates as the day goes by.
Can I change the date of my flight from Sea-Tac Airport to Lambert Field?
Expedia makes it a breeze to make changes to your SEA to Lambert Field trip yourself. Access your itinerary via the Expedia Trips portal and tap "change flight." Look for new flights and lock in the one that better suits your plans. You'll see an estimate of any flight change costs. You can also head to our Customer Service portal to chat to our Virtual Agent and get answers to your questions.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Distance
2728 km
Average flight time
5 hours 58 mins

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Seattle to St. Louis Flights

Whether you’re looking for a grand adventure or just want to get away for a last-minute break, flights from Seattle to St. Louis offer the perfect respite. Not only does exploring St. Louis 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 Seattle to St. Louis 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 to 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 St. Louis are only a plane trip away. Book your travel arrangements with us today!

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

Seattle to St. Louis Flights