$99 Cheap United flights Chicago (ORD) to Boise (BOI)

Make use of the "Price (lowest to highest)" filter on Expedia to look for cheap United Airlines return flights from $207 from ORD to BOI. Affordable one-way options from $99 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.

Start searching one to three months ahead of your travel date to get cheap fares on United Airlines flights from O'Hare Intl. Airport (ORD) to Boise Airport (BOI). You can save 25% by booking your domestic flight 34 to 86 days in advance versus 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.* Get your timing spot on, and you can enjoy significant savings on domestic trips.*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.

The earliest United Airlines flight from ORD to BOI departs at 9:00AM UTC-6, landing at 12:20PM UTC-7. If you want to set off later in the day, the last United Airlines flight leaves ORD at 7:35PM UTC-6 and touches down at BOI at 10:50PM UTC-7. Flying before midday is generally a smart option as morning and mid-morning flights tend to experience 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.

Travel from ORD to BOI with United Airlines and you'll enjoy a range of perks starting with a rewarding loyalty program. When booking through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.