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$79+ Cheap flights from Idaho to Washington

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SEA
Mar 4 — Mar 111
Wed 3/4
Wed 3/11
1 adult, Economy
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Cheap flight deals from Idaho to Washington

Cheapest flights from Idaho to Washington
Explore the most affordable flight options available from Idaho to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 2, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:00 pm
BOI
-
SEA
Nonstop1h 38m
Hawaiian Airlines
Tue 3/109:10 am
SEA
-
BOI
Nonstop1h 30m
Hawaiian Airlines
Deal found 2/1$125
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:00 pm
BOI
-
SEA
Nonstop1h 38m
Hawaiian Airlines
Sun 3/17:10 am
SEA
-
BOI
Nonstop1h 30m
Hawaiian Airlines
Deal found 2/1$135
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:50 am
BOI
-
SEA
Nonstop1h 50m
Delta
Sat 3/77:15 am
SEA
-
BOI
Nonstop1h 35m
Delta
Deal found 1/31$137
This Travelocity deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/38:20 pm
BOI
-
PDX
Nonstop1h 27m
Alaska Airlines
Tue 3/109:40 pm
PDX
-
BOI
Nonstop1h 19m
Alaska Airlines
Deal found 2/1$137
This Kiwi.com deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/133:50 pm
IDA
-
PDX
Nonstop1h 36m
Allegiant Air
Mon 7/2012:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 1/30$139
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:00 am
GEG
-
SEA
Nonstop1h 16m
Hawaiian Airlines
Wed 3/258:15 pm
SEA
-
GEG
Nonstop1h 09m
Hawaiian Airlines
Deal found 2/1$144
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/274:30 pm
BOI
-
GEG
Nonstop1h 10m
Hawaiian Airlines
Mon 3/26:00 am
GEG
-
BOI
Nonstop1h 13m
Hawaiian Airlines
Deal found 2/1$144
This Alaska Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/78:30 am
BOI
-
SEA
Nonstop1h 48m
Alaska Airlines
Mon 3/99:35 pm
SEA
-
BOI
Nonstop1h 24m
Alaska Airlines
Deal found 2/1$147
This CheapOair deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/74:02 pm
BOI
-
PDX
Nonstop1h 28m
Alaska Airlines
Mon 3/99:40 pm
PDX
-
BOI
Nonstop1h 19m
Alaska Airlines
Deal found 2/1$147
This Trip.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/177:06 pm
GEG
-
SEA
Nonstop1h 17m
Hawaiian Airlines
Tue 3/2410:53 pm
SEA
-
GEG
Nonstop1h 06m
Hawaiian Airlines
Deal found 1/31$150
This Southwest deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/245:25 pm
BOI
-
SEA
1 stop5h 25m
Southwest
Tue 3/31:20 pm
SEA
-
BOI
1 stop8h 10m
Southwest
Deal found 1/30$151
This Southwest deal was found by Cheapflights users on 1/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/257:05 am
BOI
-
PDX
1 stop7h 45m
Southwest
Tue 3/3111:00 am
PDX
-
BOI
1 stop6h 30m
Southwest
Deal found 1/30$151

Find flight deals from Idaho to Washington

Keep the following information in mind while searching for Idaho to Washington flight deals. Data was last updated February 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$125
(Kiwi.com)

One-way from

$79
(Expedia)

Popular in

June

Cheapest in

December

Average price

$172

Good round-trip deal

$157 or less

Good one-way deal

$98 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Seattle/Tacoma Intl flights.
Search Deals
From Idaho to Washington
Search Deals
One-way flight from Idaho to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Idaho to Washington.
Search Deals
Price to beat on a one-way flight from Idaho to Washington.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 2, 2026.
Use the filters below to find and compare flights from Idaho to Washington that are best for you.

Fly from

Idaho

Fly to

Washington

Route

Depart

Return

Price

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Wed 3/4

5:50 am-6:40 am

Nonstop1h 50m

Seattle/Tacoma Intl

Wed 3/11

7:35 pm-10:07 pm

Nonstop1h 32m

$137

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Tue 4/14

7:20 am-9:51 am

1 stop27h 31m

Seattle/Tacoma Intl

Wed 4/15

1:03 pm-3:29 pm

Nonstop1h 26m

$137

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Tue 2/24

5:50 am-6:40 am

Nonstop1h 50m

Seattle/Tacoma Intl

Tue 3/3

7:15 am-9:50 am

Nonstop1h 35m

$137

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Sat 3/7

10:41 am-11:35 am

Nonstop1h 54m

Seattle/Tacoma Intl

Tue 3/10

10:35 am-1:05 pm

Nonstop1h 30m

$137

Idaho FallsPortland

IDA - PDX

IDAPDX

Idaho Falls Fanning Field

Mon 7/13

3:50 pm-4:26 pm

Nonstop1h 36m

Portland

Mon 7/20

12:20 pm-3:00 pm

Nonstop1h 40m

$139

BoiseSpokane

BOI - GEG

BOIGEG

Boise Air Term. Gowen Fld

Fri 2/27

4:30 pm-4:40 pm

Nonstop1h 10m

Spokane

Mon 3/2

6:00 am-8:13 am

Nonstop1h 13m

$144

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Sat 2/28

7:30 am-8:25 am

Nonstop1h 55m

Seattle/Tacoma Intl

Sun 3/1

7:15 am-9:50 am

Nonstop1h 35m

$147

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Wed 3/4

5:25 pm-9:50 pm

1 stop5h 25m

Seattle/Tacoma Intl

Wed 3/11

2:35 pm-10:15 pm

1 stop6h 40m

$151

BoisePortland

BOI - PDX

BOIPDX

Boise Air Term. Gowen Fld

Wed 3/25

7:05 am-1:50 pm

1 stop7h 45m

Portland

Tue 3/31

11:00 am-6:30 pm

1 stop6h 30m

$151

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Tue 2/24

3:35 pm-10:35 pm

1 stop8h 00m

Seattle/Tacoma Intl

Tue 3/3

11:20 am-10:30 pm

2 stops10h 10m

$156

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 60 results
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Best time to book a flight from Idaho to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Idaho with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to Washington

What is the cheapest month to book a flight from Idaho to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Idaho to State of Washington (average of $99). Flying from Idaho to State of Washington in April is currently the most expensive (average of $137). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ID to WA?

Find hourly flight availability from Idaho to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 2, 2026.

One of the essential ways to save on airfare from Idaho to State of Washington is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 15% on airfare.

What is the cheapest day to fly from Idaho to State of Washington?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Washington. Price data was last updated on January 31, 2026.

Travelers seeking maximum savings on their Idaho to State of Washington flight should consider departing on Monday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Idaho to State of Washington

Explore weekly flight availability from Idaho to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 2, 2026.

The most flights from USID to USWA are scheduled on a Friday (52 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (36 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated February 2, 2026.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and Hawaiian Airlines from Idaho to Washington by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,829 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,829 reviews
Alaska Airlines
8.0
Very good
11,829 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,132 reviews
Alaska Airlines
8.0
Very good
11,829 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Hawaiian Airlines
7.8
Good
2,830 reviews
Alaska Airlines
8.0
Very good
11,829 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Idaho to State of Washington flight route?

    The Idaho to Washington flight path was viewed by 64 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Idaho to State of Washington?

    A quick flight from Idaho to State of Washington can take about 1h 36m. Delta provides one of the quickest options available for as low as $139. Idaho and State of Washington are separated by a distance of 537 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Idaho to State of Washington one-way?

    The cheapest airlines for a one-way flight from Idaho to State of Washington are Hawaiian Airlines ($68), Alaska Airlines ($69), and Delta ($69).

  • Can I find deals for flights from Idaho to Washington that include hotel bookings?

    Yes. In addition to deals on Idaho to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Washington.

  • Can I find deals for business class flights from Idaho to Washington?

    Yes. Cheapflights offers flight deals from Idaho to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Idaho to State of Washington (average of $99). Flying from Idaho to State of Washington in April is currently the most expensive (average of $137). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Idaho to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Idaho to Washington

Discover the top 3 airlines that operate flights from Idaho to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$98Average$320FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$99Average$294FlexibilityNo cancel feeOn-time75%
Hawaiian AirlinesCheapest$117Average$274FlexibilityNo cancel feeOn-time85%

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