SEA

$73 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 9/11. 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 - Sun, Sep 6
Alaska Airlines Logo
4:20 pm - 4:56 pm
BOI
-
SEA
1h 36mnonstop
Alaska Airlines Logo
7:18 am - 9:52 am
SEA
-
BOI
1h 34mnonstop
$157Alaska Airlines
Mon, Sep 7 - Tue, Sep 15
Delta Logo
8:59 am - 9:49 am
BOI
-
SEA
1h 50mnonstop
Delta Logo
7:59 pm - 10:34 pm
SEA
-
BOI
1h 35mnonstop
$167Delta
Sat, Sep 26 - Sat, Sep 26
Alaska Airlines Logo
6:23 am - 7:02 am
BOI
-
SEA
1h 39mnonstop
Alaska Airlines Logo
10:13 am - 8:20 pm
SEA
-
BOI
9h 07m
1 stop
$176Alaska Airlines
Tue, Sep 29 - Sat, Oct 3
Delta Logo
8:55 am - 9:50 am
BOI
-
SEA
1h 55mnonstop
Delta Logo
7:15 am - 9:54 am
SEA
-
BOI
1h 39mnonstop
$177Delta
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
$183Multiple Airlines
Thu, Sep 10 - Sat, Sep 12
Multiple Airlines Logo
10:09 am - 5:45 pm
GEG
-
SEA
7h 36m
1 stop
Multiple Airlines Logo
9:16 pm - 9:19 am
SEA
-
GEG
12h 03m
1 stop
$187Multiple Airlines
Sat, Sep 5 - Sun, Sep 6
Southwest Logo
7:45 am - 3:55 pm
BOI
-
SEA
9h 10m
1 stop
Southwest Logo
6:05 am - 2:55 pm
SEA
-
BOI
7h 50m
1 stop
$188Southwest
Tue, Sep 1 - Tue, Sep 8
Southwest Logo
2:20 pm - 9:15 pm
BOI
-
SEA
7h 55m
2 stops
Southwest Logo
7:40 am - 3:00 pm
SEA
-
BOI
6h 20m
1 stop
$192Southwest
Sat, Sep 5 - Sat, Sep 26
United Airlines Logo
9:28 am - 4:14 pm
JAC
-
SEA
7h 46m
1 stop
United Airlines Logo
7:11 am - 4:39 pm
SEA
-
JAC
8h 28m
1 stop
$267United Airlines
Thu, Aug 27 - Mon, Aug 31
United Airlines Logo
4:25 pm - 11:04 pm
JAC
-
SEA
7h 39m
1 stop
United Airlines Logo
7:11 am - 4:39 pm
SEA
-
JAC
8h 28m
1 stop
$287United Airlines
Useful Info

Good to know

Low season

January

Cheapest flight

$73
Best time to beat the crowds with an average 21% 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
DuPont
Shoreline
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)