$104 Cheap Frontier Airlines flights Baltimore (BWI) to San Francisco (SFO)

Finding cheap one-way Frontier Airlines flights from BWI to SFO from $104 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Or check out our budget-friendly round-trip fares from $183 for your next exciting getaway.**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.

February is one of the least expensive months to fly to San Francisco with Frontier Airlines. You could also find great deals on one-way and round-trip fares in April.

Look for affordable Frontier Airlines flights from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Francisco Intl. Airport (SFO) one to three months ahead of your departure day. 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. Regardless of fare class and itinerary, the ideal day to book a domestic flight is usually 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.

Select our “Nonstop” filter when searching for direct Frontier Airlines flights from BWI to SFO. It’s also a great way to compare other airlines servicing the same nonstop journey.

Search Frontier Airlines’s earliest flights from BWI to SFO by checking our “Early Morning” and “Morning” filters. Not only will you get to your destination sooner, early departures also have a 20% less chance of being canceled.**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.

Get on a Frontier Airlines flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to San Francisco, and you’ll probably land at San Francisco Intl. Airport (SFO). This is the airline’s main hub in this destination.

Depart from BWI to SFO with Frontier Airlines and you’ll enjoy a range of perks including a rewarding loyalty program. When booking through Expedia as a Frontier Miles and One Key™ member, you may also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Typically, you can modify or cancel your flight, although there may be additional fees if you made your booking over 24 hours ago. Need to keep your options open? Make use of Expedia’s “No cancel fee” or “Changes included” filter to find flights that won’t charge extra if you have to revise your plans. To make modifications, visit “Trips,” select your flight and click on “Manage Booking” for more information.