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Cheap Flights from Boise to Seattle (BOI to SEA) from $81.00

Compare the cheapest Boise (BOI) to Seattle (SEA) fares found by our live flight search, then book online or over the phone with our travel experts.

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Adults
12+
1
Children
2–11
0
Infants
Under 2
0
Cabin
🏷️
Save up to 40% with unpublished phone fares
Consolidator deals on selected Boise → Seattle flights that do not appear in online search results. The live fares below are bookable right now — or call to check for an unpublished fare on your dates.
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One-way fares Boise → Seattle

showing indicative fares · loading live prices…
Alaska Airlines
Alaska Airlines CHEAPEST
BOI → SEA · Economy
lowest fare seen on this route
$135.11
$81.07
Select
Delta Air Lines
Delta Air Lines
BOI → SEA · Economy
lowest fare seen on this route
$150.84
$90.50
Select
Frontier
Frontier
BOI → SEA · Economy
lowest fare seen on this route
$155.46
$93.28
Select
United Airlines
United Airlines
BOI → SEA · Economy
lowest fare seen on this route
$163.11
$97.87
Select
Southwest
Southwest
BOI → SEA · Economy
lowest fare seen on this route
$177.39
$106.43
Select
American Airlines
American Airlines
BOI → SEA · Economy
lowest fare seen on this route
$356.82
$214.09
Select
See all flights & times → Prices per adult, one way, incl. taxes & fees. Availability changes constantly.
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Cheapest fares from Boise to Seattle

Lowest fare found per airline on the BOI → SEA route, with our discounted phone-deal price.

AirlineCabin Found fareOur discounted fare Fare found on
Alaska Airlines Alaska Airlines Economy $135.11 $81.07 Sep 16, 2026 Book
Delta Air Lines Delta Air Lines Economy $150.84 $90.50 Sep 16, 2026 Book
Frontier Frontier Economy $155.46 $93.28 Sep 16, 2026 Book
United Airlines United Airlines Economy $163.11 $97.87 Sep 16, 2026 Book
Southwest Southwest Economy $177.39 $106.43 Sep 16, 2026 Book
American Airlines American Airlines Economy $356.82 $214.09 Sep 16, 2026 Book

Discounted fares are negotiated phone deals from our vendor network and may not appear in online search results — call 1-856-513-6369 to lock one in. Fares were found on the dates shown, are per person in USD, and change with availability.

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Page updated September 20, 2026 · fare data refreshed automatically from live flight searches.