$115 Cheap Frontier Airlines flights San Francisco (SFO) to Baltimore (BWI)

You'll find budget-friendly return Frontier Airlines flights from $187 from SFO to BWI by sorting your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $115 for a one-way journey.**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.

To find cheap Frontier Airlines fares from San Francisco Intl. Airport (SFO) to Baltimore Washington Intl. Thurgood Marshall Airport (BWI), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the cost. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**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.

To find the earliest departure from SFO to BWI with Frontier Airlines, sort your results by "Early Morning" and "Morning." Choosing an early flight generally means you're less likely to experience 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.

A rewarding loyalty program and the ability to rack up points through Frontier Miles are the start of the reasons to jet off from SFO to BWI with Frontier Airlines. Plus, when you sign up to Expedia's free One Key™ program, you can earn OneKeyCash™* on top of Frontier Airlines's loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.