$79 Cheap Delta flights Seattle (SEA) to Boise (BOI)

Set the "Price (lowest to highest)" filter on Expedia to look for cheap Delta Air Lines round-trip flights from $117 from SEA to BOI. Affordable one-way options from $79 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.

Search for cheap Delta Air Lines flights from Seattle - Tacoma Intl. Airport (SEA) to Boise Airport (BOI) one to three months ahead of your day of departure. 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. No matter the fare type and itinerary, the best day of the week to book a domestic flight is generally Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel 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.

The first flight from SEA to BOI with Delta Air Lines departs at 7:20AM UTC-8. You'll land at 9:54AM UTC-7. The last Delta Air Lines flight of the day leaves at 9:20PM UTC-8 and arrives at 11:46PM UTC-7. With around 20% fewer cancellations for early and mid-morning flights, heading out early is typically the best way to go.**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.

With an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a top choice for many travelers flying from SEA to BOI. What's more, if you're a Delta SkyMiles and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can go toward future getaways.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.