Cheap flights from Boise to Seattle

One-way fares from $216 · BOI → SEA · prices found by travellers in the last 48 hours

Compare all dates Seattle → Boise
Cheapest fare
$216

Frontier Airlines · Thu, Nov 5

Cheapest month
November

from $216

Direct flights
Yes

Alaska Airlines

Flight time
1h 39m

650 km

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Cheapest month to fly from Boise to Seattle

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 Cheapest $216

Cheapest dates in November 2026

The lowest fares we've seen for each day, cheapest first.

Frontier Airlines
Depart14:49 Thu, Nov 5BOI → SEA 4h 49m · 1 stop
$216one way, per person
View deal
Alaska Airlines
Depart10:49 Wed, Nov 18BOI → SEA 1h 39m · Direct
$225one way, per person
View deal
Alaska Airlines
Depart10:49 Fri, Nov 13BOI → SEA 1h 39m · Direct
$231one way, per person
View deal
Alaska Airlines
Depart06:37 Tue, Nov 10BOI → SEA 1h 43m · Direct
$232one way, per person
View deal
See every date in November 2026 →

Plan the rest of your trip to Seattle

Where to stay, what to do and getting around, from our travel partners.

Where to stay

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Things to do

Things to do in SeattleTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in SeattlePre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in SeattleCompare rental cars from major brands on EconomyBookings Compare cars →

About flights from Boise to Seattle

Boise (BOI) and Seattle (SEA) are about 650 km apart. Direct flights take around 1h 39m, and recent direct fares were with Alaska Airlines. Over the next few months, one-way fares start from $216, and November 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Boise to Seattle?

The cheapest one-way fare we've seen recently is $216 with Frontier Airlines, departing Thursday, November 5, 2026.

What is the cheapest month to fly from Boise to Seattle?

November 2026 currently has the lowest fares, from $216 one way.

Are there direct flights from Boise to Seattle?

Yes. Recent direct fares were with Alaska Airlines.

How long is the flight from Boise to Seattle?

A direct flight takes about 1h 39m. Boise and Seattle are around 650 km apart.

Which airlines fly from Boise to Seattle?

Recent fares on this route were with Frontier Airlines and Alaska Airlines.

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