SEA

$87 Find Cheap Flights from Idaho to Seattle - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 9/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from Idaho to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Idaho to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Idaho to Seattle

Sat, Sep 5 - Sat, Sep 12
Alaska Airlines Logo
2:17 pm - 2:53 pm
BOI
-
SEA
1h 36mnonstop
Alaska Airlines Logo
7:15 am - 9:56 am
SEA
-
BOI
1h 41mnonstop
$177Alaska Airlines
Wed, Sep 9 - Thu, Sep 10
Alaska Airlines Logo
6:49 pm - 9:20 am
BOI
-
SEA
15h 31m
1 stop
Alaska Airlines Logo
1:03 pm - 3:30 pm
SEA
-
BOI
1h 27mnonstop
$182Alaska Airlines
Fri, Oct 9 - Fri, Oct 9
Alaska Airlines Logo
6:04 pm - 6:47 pm
BOI
-
SEA
1h 43mnonstop
Alaska Airlines Logo
9:08 pm - 1:47 pm
SEA
-
BOI
15h 39m
1 stop
$182Alaska Airlines
Tue, Sep 1 - Sat, Sep 5
Delta Logo
3:29 pm - 4:10 pm
BOI
-
SEA
1h 41mnonstop
Delta Logo
2:45 pm - 5:19 pm
SEA
-
BOI
1h 34mnonstop
$187Delta
Wed, Nov 11 - Tue, Nov 17
Delta Logo
10:37 am - 11:36 am
BOI
-
SEA
1h 59mnonstop
Delta Logo
12:59 pm - 3:33 pm
SEA
-
BOI
1h 34mnonstop
$187Delta
Sat, Sep 19 - Tue, Sep 22
Delta Logo
6:45 am - 7:35 am
BOI
-
SEA
1h 50mnonstop
Delta Logo
4:04 pm - 6:40 pm
SEA
-
BOI
1h 36mnonstop
$187Delta
Mon, Sep 28 - Sat, Oct 3
Frontier Logo
3:52 pm - 9:42 am
BOI
-
SEA
18h 50m
1 stop
Frontier Logo
9:45 pm - 2:57 pm
SEA
-
BOI
16h 12m
1 stop
$195Frontier
Tue, Nov 10 - Tue, Nov 17
United Airlines Logo
12:00 pm - 6:26 pm
BOI
-
SEA
7h 26m
1 stop
United Airlines Logo
3:35 pm - 11:33 pm
SEA
-
BOI
6h 58m
1 stop
$207United Airlines
Sat, Sep 26 - Tue, Oct 13
United Airlines Logo
6:50 pm - 11:27 pm
BOI
-
SEA
5h 37m
1 stop
United Airlines Logo
7:11 am - 12:58 pm
SEA
-
BOI
4h 47m
1 stop
$207United Airlines
Mon, Aug 24 - Thu, Aug 27
Multiple Airlines Logo
5:33 pm - 10:39 am
IDA
-
SEA
18h 06m
1 stop
Multiple Airlines Logo
9:29 pm - 10:22 am
SEA
-
IDA
11h 53m
1 stop
$270Multiple Airlines
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Good to know

Low season

January

Cheapest flight

$87
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 26% increase in price.
Flight from Boise to Seattle

Flights from Idaho to Seattle: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Idaho to Seattle 
Learn how KAYAK collects reviews and tips from users.
AllisonFlew with Alaska Airlines
BOI
-
SEA
Mar 2026
Boise airport is quick to get through security and very easy to navigate, so you don’t need to give yourself as much time as you normally would at larger airports.
Verified travelerFlew with Hawaiian Airlines
IDA
-
SEA
Jun 2025
Idaho Falls is not a large airport, so it was easy to find my way around. Take a meal if you want more than a snack.

FAQs for booking flights from Idaho to Seattle

  • How does KAYAK find such low prices on flights from Idaho to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Idaho to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Idaho to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Idaho is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Idaho to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Idaho with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Idaho to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Idaho up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Mukilteo
Westport
Lacey
Woodinville
Poulsbo
Edmonds
Aberdeen
Shoreline
DuPont
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)