$105 Cheap Frontier Airlines flights San Francisco (SFO) to Chicago (ORD)

You’ll find cheap return Frontier Airlines flights from $205 from SFO to ORD by organizing your results from “Price (lowest to highest)” on Expedia. Or search for options from $105 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.

Frontier Airlines flights to Chicago are often cheaper in the off-peak months of January and February. Whether you’re searching for a one-way or a return ticket, you could score a better deal then.

Start searching one to three months before your departure to score cheaper fares on Frontier Airlines flights from San Francisco Intl. Airport (SFO) to O’Hare Intl. Airport (ORD). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to 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.* Nail your timing, 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.

Enter your dates, press search and check the “Nonstop” filter on Expedia to find any direct flights from SFO to ORD with Frontier Airlines or other carriers.

Sort your results by “Early Morning” and “Morning” to find the earliest departures from SFO to ORD. Jetting off early means you’re 20% 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.

O’Hare Intl. Airport (ORD) is the primary Chicago hub for Frontier Airlines flights from San Francisco Intl. Airport (SFO).

Offering a rewarding loyalty program, Frontier Airlines is a top pick for many passengers journeying from SFO to ORD. Plus, as a Frontier Miles and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are typically free within 24 hours of booking, but your airline may charge you after that. For more details about altering your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to change your itinerary without being charged, tick the “Changes included” and “No cancel fee” filters when planning your next trip.