Domestic route
Cheap flights from Boise to Seattle
Boise Airport (BOI) to Seattle-Tacoma International Airport (SEA). 398 miles, 1h 20m nonstop.
BOI to SEA 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
- February 2027over the next six months
- Best day to fly
- Tuesday17% less than Sunday
- Time difference
- 1h behindSeattle vs Boise
Boise to Seattle
Round trips from $57
Per traveler, taxes and fees included. Lowest fare we found departs Wed, Feb 3.
Cheapest month: February 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppBoise to Seattle 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 Boise to Seattle
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 BOI to SEA 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 17% less than a Sunday 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.
Destination guide
Seattle: Coffee, mountains and Puget Sound
Seattle is the Pacific Northwest's gateway: Pike Place Market, the Space Needle and ferries across Puget Sound, with Mount Rainier and the Olympic Peninsula a couple of hours away. Sea-Tac is a Delta and Alaska hub with light rail downtown.
Best time to visit: July–September is dry, sunny and gorgeous — and the most expensive. May–June and late September are good compromises. October–April is gray and drizzly but cheap.
Flying the other way? Seattle to BoiseFares, airlines and tips for SEA to BOI.Ready to compare live fares?
See every airline on BOI–SEA side by side with bags and seat rules spelled out.
Search Boise to SeattleBoise to Seattle: common questions
How long is the flight from Boise to Seattle?
A nonstop flight from Boise (BOI) to Seattle (SEA) 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 BOI to SEA?
Delta Air Lines, Southwest Airlines, Alaska Airlines and Spirit Airlines operate nonstop flights from Boise (BOI) to Seattle (SEA), with 8 nonstop departures a day between them.
What is the cheapest month to fly from Boise to Seattle?
Over the next six months, February 2027 has the lowest round-trip fares from Boise (BOI) to Seattle (SEA), 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 Boise to Seattle 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 Boise and Seattle?
Seattle is 1 hour behind Boise. BOI is on America/Boise time and SEA on America/Los Angeles 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.