฿6,335 Cheap Flights from Seattle (SEA) to St. Louis (STL)

Based on fares listed within the last 7 days on Expedia for flights departing within the next year, round-trip flights between SEA and Lambert Field start from . Book now to get the best price for your big adventure. Prices and availability are subject to change. Additional terms apply.

The majority of flights can be cancelled online, but whether you incur a fee differs between airlines. If you do have to cancel your getaway, follow the instructions in the Customer Service Portal.

Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Seattle - Tacoma Intl. Airport (SEA) to STL flights, you'll see a "no change fees" filter for you to select.

The flight distance from SeaTac to St. Louis is 2,700 kilometres. Pack yourself a drink, a snack and an interesting book to read. Keep yourself entertained and the hours will zip by.

A favourite with many savvy travellers, Alaska Airlines (AS) operates 30 monthly flights from SEA to STL. Pick the one that fits in with your travel plans and book your ticket today.

Booking your trip from Sea-Tac Airport to St. Louis Lambert International Airport at the last minute could be your ticket to an awesome deal. However, it might cost you a whole lot more! If you'd prefer not to take any chances, book well ahead of your departure date. In fact, Expedia has some of the best bargains as far ahead as 12 months in advance. If your preferred air carrier hasn't released tickets yet, check back regularly as deals are updated on Expedia all the time.