Domestic route
Cheap flights from Seattle to Boise
Seattle-Tacoma International Airport (SEA) to Boise Airport (BOI). 398 miles, 1h 20m nonstop.
SEA to BOI at a glance
Computed from airline schedules and the fares we track for this route. Refreshed several times a day.
- Distance
- 398 milesgreat-circle
- Typical flight time
- 1h 20mnonstop, gate to gate
- Nonstop airlines
- DLWNASNK4 airlinesDelta, Southwest, Alaska
- Nonstop flights per day
- 8all airlines combined
- Cheapest month
- January 2027over the next six months
- Best day to fly
- Tuesday16% less than Friday
- Time difference
- 1h aheadBoise vs Seattle
Seattle to Boise
Round trips from $57
Per traveler, taxes and fees included. Lowest fare we found departs Tue, Jan 19.
Cheapest month: January 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppSeattle to Boise fares by month
Lowest round-trip economy fare per traveler in each of the next six months, taxes and fees included. Select a month to search that date.
Airlines flying Seattle to Boise
4 airlines fly nonstop with 8 departures a day combined.
- ASAlaska AirlinesoneworldNonstop · 3 flights a day · first checked bag from $35
- DLDelta Air LinesSkyTeamNonstop · 3 flights a day · first checked bag from $35
- WNSouthwest AirlinesLow-costNonstop · 1 flight a day · first checked bag from $35
- NKSpirit AirlinesLow-costNonstop · 1 flight a day · first checked bag from $55
Connecting options
Every itinerary on this route is nonstop or uses an unusual connection; run a search for specifics.
Tips for this route
- Delta, Southwest, Alaska and Spirit all fly SEA to BOI nonstop, so compare the total with bags before picking the lowest base fare: the difference between a basic and a standard economy ticket is often less than one checked bag each way.
- Departing on a Tuesday averages 16% less than a Friday on this route. If your dates are flexible, shift the outbound by a day or two and check the calendar view before you book.
- Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks.
- At 398 miles this is a short hop of 1h 20m, so an early-morning departure, which is usually the cheapest and most punctual of the day, costs you little sleep.
Ready to compare live fares?
See every airline on SEA–BOI side by side with bags and seat rules spelled out.
Search Seattle to BoiseSeattle to Boise: common questions
How long is the flight from Seattle to Boise?
A nonstop flight from Seattle (SEA) to Boise (BOI) takes about 1h 20m gate to gate, covering 398 miles. Connecting itineraries add the layover, typically 1 to 3 hours more in total.
Which airlines fly nonstop from SEA to BOI?
Delta Air Lines, Southwest Airlines, Alaska Airlines and Spirit Airlines operate nonstop flights from Seattle (SEA) to Boise (BOI), with 8 nonstop departures a day between them.
What is the cheapest month to fly from Seattle to Boise?
Over the next six months, January 2027 has the lowest round-trip fares from Seattle (SEA) to Boise (BOI), starting at $57 per traveler including taxes and fees. Within any month, Tuesday departures average the lowest prices.
How far in advance should I book Seattle to Boise flights?
Fares on this route are usually lowest 4 to 8 weeks before departure and rise sharply inside two weeks. Air1 Tickets includes free cancellation within 24 hours of booking on every fare, so you can lock in a good price and keep looking.
What is the time difference between Seattle and Boise?
Boise is 1 hour ahead of Seattle. SEA is on America/Los Angeles time and BOI on America/Boise time. Departure and arrival times in search results are always shown in local time at each airport.
Related routes
Other popular city pairs from the same departure city and to the same destination, with the lowest round-trip fares we found.