$148 Cheap Alaska Airlines flights San Francisco (SFO) to St. Louis (STL)

You’ll find cheap round-trip Alaska Airlines flights from $201 from SFO to STL by organizing your results from “Price (lowest to highest)” on Expedia. Or search for options from $148 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines flights to St. Louis are often more affordable in the quieter months of January and February. Whether you need a one-way or a return ticket, you could score a better deal then.

Begin your search one to three months ahead of your travel date to get cheap fares on Alaska Airlines flights from San Francisco Intl. Airport (SFO) to Lambert-St. Louis Intl. Airport (STL). You can save 25% by booking your domestic flight 34 to 86 days in advance versus last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get the timing right, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Fill in your dates, press search and select “Nonstop” on Expedia to find any direct flights from SFO to STL with Alaska Airlines or another airline.

Filter your results by “Morning” and “Early Morning” to browse the earliest flights from SFO to STL. Heading off early means flight cancellations are less likely.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Lambert-St. Louis Intl. Airport (STL) is the main St. Louis gateway for Alaska Airlines flights from San Francisco Intl. Airport (SFO).

Alaska Airlines makes flying from SFO to STL more enjoyable with a rewarding loyalty program and top-tier customer service. You could even start earning points with Mileage Plan. Remember to join Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

It’s usually possible to change or cancel your flight, although additional fees may apply if you booked over 24 hours ago. Prefer to keep your options open? Use Expedia’s “No cancel fee” or “Changes included” filter to find flights that won’t penalize you if you have to revise your plans. To make modifications, head to “Trips,” select your flight and click on “Manage Booking” for more details.