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$41+ 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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SEA
Jun 8 — Jun 151
Mon 6/8
Mon 6/15
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 May 9, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/9. 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 7/103:50 pm
IDA
-
PDX
Nonstop1h 36m
Allegiant Air
Fri 7/1712:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/9$76
This Kiwi.com deal was found by Cheapflights users on 5/8. 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 7/103:50 pm
IDA
-
PDX
Nonstop1h 36m
Allegiant Air
Fri 7/3112:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/8$78
This Kiwi.com deal was found by Cheapflights users on 5/5. 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
Fri 7/1712:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/5$79
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 5/296:39 pm
IDA
-
PDX
Nonstop1h 41m
Allegiant Air
Mon 6/13:10 pm
PDX
-
IDA
Nonstop1h 39m
Allegiant Air
Deal found 5/5$82
This Kiwi.com deal was found by Cheapflights users on 5/8. 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 6/86:39 pm
IDA
-
PDX
Nonstop1h 39m
Allegiant Air
Fri 6/123:09 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/8$91
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 5/256:39 pm
IDA
-
PDX
Nonstop1h 41m
Allegiant Air
Mon 6/13:10 pm
PDX
-
IDA
Nonstop1h 39m
Allegiant Air
Deal found 5/5$94
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 6/296:39 pm
IDA
-
PDX
Nonstop1h 39m
Allegiant Air
Mon 7/2012:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/5$95
This Super.com deal was found by Cheapflights users on 5/6. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/56:39 pm
IDA
-
PDX
Nonstop1h 39m
Allegiant Air
Mon 6/153:09 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/6$98
This Mytrip deal was found by Cheapflights users on 5/5. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/86:39 pm
IDA
-
PDX
Nonstop1h 39m
Allegiant Air
Mon 6/153:09 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/5$99
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 7/203:50 pm
IDA
-
PDX
Nonstop1h 36m
Allegiant Air
Fri 7/2412:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/5$100
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 7/203:50 pm
IDA
-
PDX
Nonstop1h 36m
Allegiant Air
Mon 7/2712:20 pm
PDX
-
IDA
Nonstop1h 40m
Allegiant Air
Deal found 5/7$101
This Delta deal was found by Cheapflights users on 5/6. 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.
Fri 6/59:18 pm
BOI
-
SEA
Nonstop1h 47m
Delta
Sun 6/77:15 am
SEA
-
BOI
Nonstop1h 41m
Delta
Deal found 5/6$137

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 May 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$76
(Kiwi.com)

One-way from

$41
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$208

Good round-trip deal

$217 or less

Good one-way deal

$198 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. 18% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 9, 2026.
Use the filters below to find and compare flights from Idaho to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Thu 6/25

6:43 am-7:35 am

Nonstop1h 52m

Seattle/Tacoma Intl

Sun 6/28

7:15 am-9:56 am

Nonstop1h 41m

$137

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Thu 6/4

10:39 am-11:34 am

Nonstop1h 55m

Seattle/Tacoma Intl

Sun 6/7

8:35 am-11:15 am

Nonstop1h 40m

$137

BoiseSeattle

BOI - SEA

BOISEA

Boise Air Term. Gowen Fld

Fri 6/5

12:05 pm-11:50 pm

2 stops12h 45m

Seattle/Tacoma Intl

Sun 6/7

6:15 am-3:20 pm

1 stop8h 05m

$173

BoiseSpokane

BOI - GEG

BOIGEG

Boise Air Term. Gowen Fld

Tue 6/9

2:50 pm-2:58 pm

Nonstop1h 08m

Spokane

Sat 6/20

7:24 pm-9:38 pm

Nonstop1h 14m

$217

BoisePortland

BOI - PDX

BOIPDX

Boise Air Term. Gowen Fld

Fri 5/29

7:55 pm-12:55 am

1 stop6h 00m

Portland

Sun 5/31

5:00 am-9:55 am

1 stop3h 55m

$217
Quickest round-trip

BoiseSpokane

BOI - GEG

BOIGEG

Boise Air Term. Gowen Fld

Thu 6/18

7:40 am-7:51 am

Nonstop1h 11m

Spokane

Thu 6/25

6:00 am-8:07 am

Nonstop1h 07m

$217

BoisePortland

BOI - PDX

BOIPDX

Boise Air Term. Gowen Fld

Sat 5/30

6:00 pm-9:18 pm

1 stop4h 18m

Portland

Wed 6/3

5:30 am-11:34 am

1 stop5h 04m

$217

SpokanePortland

GEG - PDX

GEGPDX

Spokane

Thu 6/4

5:00 am-6:15 am

Nonstop1h 15m

Portland

Sun 6/7

7:15 am-8:28 am

Nonstop1h 13m

$217

SpokaneSeattle

GEG - SEA

GEGSEA

Spokane

Wed 6/3

12:46 pm-2:02 pm

Nonstop1h 16m

Seattle/Tacoma Intl

Sat 6/6

8:26 am-2:58 pm

1 stop6h 32m

$222

BoisePortland

BOI - PDX

BOIPDX

Boise Air Term. Gowen Fld

Thu 6/25

5:55 pm-1:20 am

1 stop8h 25m

Portland

Tue 6/30

5:50 pm-12:30 am

1 stop5h 40m

$225

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/6

Showing 1-10 of 60 resultsSorted by cheapest first
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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

How far ahead should I book a flight from Idaho to State of Washington?

The price you pay for your flight from Idaho to State of Washington may vary depending on when you book. For the best chance of a lower fare, look to book 88 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, March is the cheapest month in which you can book a flight from Idaho to State of Washington (average of $59). Flying from Idaho to State of Washington in July is currently the most expensive (average of $119). 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 May 9, 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 in the evening could potentially save you up to 19% 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 May 9, 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. Wednesday mornings 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 May 9, 2026.

The most flights from USID to USWA are scheduled on a Saturday (40 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (16 on average).

How much does it cost to fly round-trip from Idaho to State of Washington?

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 May 9, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andHawaiian 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
7.9
Good
12,349 reviews

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Alaska Airlines
7.9
Good
12,349 reviews
Alaska Airlines
7.9
Good
12,349 reviews

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Delta
7.9
Good
8,457 reviews
Alaska Airlines
7.9
Good
12,349 reviews

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Hawaiian Airlines
7.8
Good
2,837 reviews
Alaska Airlines
7.9
Good
12,349 reviews

Crew

8.5

Overall

7.9

Food

7.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well

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 74 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 08m. Southwest provides one of the quickest options available for as low as $217. Idaho and State of Washington are separated by a distance of 287 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 Alaska Airlines ($69), Delta ($69), and Southwest ($75).

  • 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, March is the cheapest month in which you can book a flight from Idaho to State of Washington (average of $59). Flying from Idaho to State of Washington in July is currently the most expensive (average of $119). 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 May 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$97Average$299FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$98Average$247FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$99Average$293FlexibilityNo cancel feeOn-time75%

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