$110 Cheap Frontier Airlines flights Chicago (ORD) to San Francisco (SFO)

Make use of the “Price (lowest to highest)” filter on Expedia to find cheap Frontier Airlines round-trip flights from $208 from ORD to SFO. Affordable one-way fares from $110 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.

Frontier Airlines flights to San Francisco tend to be cheaper in the quieter months of February and April. Whether you’re after a one-way or round-trip ticket, you could find a better deal then.

For cheap Frontier Airlines fares from O’Hare Intl. Airport (ORD) to San Francisco Intl. Airport (SFO), 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 figure out if there’s a direct trip from ORD to SFO with Frontier Airlines or other airlines, select the “Nonstop” filter when searching for flights.

Filter your results by “Morning” and “Early Morning” to find the earliest flights from ORD to SFO. Taking off early 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.

Frontier Airlines flights from O’Hare Intl. Airport (ORD) to San Francisco land at San Francisco Intl. Airport (SFO). This is the main gateway here.

A rewarding loyalty program and the opportunity to collect points through Frontier Miles are the start of the reasons to depart from ORD to SFO with Frontier Airlines. Plus, when you join Expedia’s free One Key™ program, you can earn OneKeyCash™* alongside Frontier Airlines’s loyalty program earnings. It’s yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are generally free within 24 hours of making your booking, but your airline may charge a fee after that. For further information about modifying your reservation, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the freedom to change your plans without extra charges, apply the “No cancel fee” or “Changes included” filter when organizing your trip.