$160 Cheap Southwest Airlines flights St. Louis (STL) to San Jose (SJC)

Apply the "Price (lowest to highest)" filter on Expedia to find cheap Southwest Airlines return flights from $319 from STL to SJC. Affordable one-way fares from $160 are also on offer.**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.

Look for cheap Southwest Airlines flights from Lambert-St. Louis Intl. Airport (STL) to Norman Y. Mineta San Jose Intl. Airport (SJC) one to three months ahead of your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and journey, the ideal day to book a domestic flight is generally Sunday and the most expensive is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**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.

Search Southwest Airlines's earliest flights from STL to SJC by checking the "Early Morning" and "Morning" filters. Not only will you get to where you're going sooner, early departures also experience 20% fewer cancellations.**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.