$79+ Cheap flights from Washington to Idaho
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 5/31. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOI
Jun 5 — Jun 121
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Washington to Idaho with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Washington to Idaho
Cheapest
Best
Last-minute
One-way
Cheapest flights from Washington to IdahoExplore the most affordable flight options available from Washington to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 6, 2026.
Explore the most affordable flight options available from Washington to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 6, 2026.
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/281:04 pm
SEA
- BOI
Nonstop1h 30m
Alaska Airlines
Mon 6/18:51 pm
BOI
- SEA
Nonstop1h 38m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$134
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.
Thu 6/117:15 am
SEA
- BOI
Nonstop1h 41m
Delta
Sun 6/146:43 am
BOI
- SEA
Nonstop1h 52m
Delta
Deal found 5/6![Delta logo]()
$137
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:35 pm
SEA
- BOI
1 stop5h 50m
Southwest
Tue 6/97:55 pm
BOI
- SEA
1 stop4h 35m
Southwest
Deal found 5/5![Southwest logo]()
$157
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:35 am
SEA
- BOI
2 stops8h 05m
Southwest
Sat 6/65:10 pm
BOI
- SEA
2 stops8h 25m
Southwest
Deal found 5/5![Southwest logo]()
$167
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:30 am
SEA
- BOI
1 stop5h 00m
Southwest
Fri 6/1212:05 pm
BOI
- SEA
2 stops12h 45m
Southwest
Deal found 5/5![Southwest logo]()
$168
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:40 am
SEA
- BOI
2 stops11h 10m
Southwest
Mon 6/11:20 pm
BOI
- SEA
1 stop10h 15m
Southwest
Deal found 5/6![Southwest logo]()
$173
This Delta deal was found by Cheapflights users on 5/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:59 pm
SEA
- BOI
Nonstop1h 33m
Delta
Sat 6/66:00 pm
BOI
- SEA
Nonstop1h 40m
Delta
Deal found 5/1![Delta logo]()
$177
This Trip.com deal was found by Cheapflights users on 5/2. 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.
Thu 5/289:29 pm
SEA
- BOI
Nonstop1h 29m
Alaska Airlines
Tue 6/28:51 pm
BOI
- SEA
Nonstop1h 38m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 5/1. 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.
Wed 6/39:29 pm
SEA
- BOI
Nonstop1h 29m
Alaska Airlines
Mon 6/84:19 pm
BOI
- SEA
Nonstop1h 40m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$187
This United Airlines deal was found by Cheapflights users on 5/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/211:16 am
PDX
- BOI
1 stop4h 28m
United Airlines
Tue 6/97:05 pm
BOI
- PDX
1 stop4h 44m
United Airlines
Deal found 5/3![United Airlines logo]()
$187
This SmartFares deal was found by Cheapflights users on 5/2. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:20 pm
GEG
- BOI
Nonstop1h 08m
Alaska Airlines
Sun 5/247:00 am
BOI
- GEG
Nonstop1h 07m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$192
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3010:25 am
SEA
- GEG
Nonstop1h 17m
Alaska Airlines
Sat 5/301:59 pm
GEG
- SEA
Nonstop1h 16m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$192
Best flights from Washington to IdahoDiscover carefully curated flight deals from Washington to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 6, 2026.
Discover carefully curated flight deals from Washington to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 6, 2026.
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.
Thu 6/117:15 am
SEA
- BOI
Nonstop1h 41m
Delta
Sun 6/146:43 am
BOI
- SEA
Nonstop1h 52m
Delta
Deal found 5/6![Delta logo]()
$137
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/31:04 pm
SEA
- BOI
Nonstop1h 30m
Alaska Airlines
Mon 6/86:07 pm
BOI
- SEA
Nonstop1h 45m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$137
This Southwest deal was found by Cheapflights users on 5/4. 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 6/35:30 am
PDX
- BOI
1 stop6h 00m
Southwest
Wed 6/104:20 pm
BOI
- PDX
1 stop8h 45m
Southwest
Deal found 5/4![Southwest logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 5/3. 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.
Wed 6/38:26 am
SEA
- BOI
Nonstop1h 37m
Alaska Airlines
Sat 6/68:51 pm
BOI
- SEA
Nonstop1h 38m
Alaska Airlines
Deal found 5/3![Alaska Airlines logo]()
$177
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:35 am
SEA
- BOI
Nonstop1h 40m
Delta
Fri 6/127:53 pm
BOI
- SEA
Nonstop1h 57m
Delta
Deal found 5/5![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 5/3. 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.
Mon 6/810:00 am
PDX
- BOI
1 stop4h 45m
Southwest
Thu 6/117:40 pm
BOI
- PDX
1 stop5h 50m
Southwest
Deal found 5/3![Southwest logo]()
$230
This Alaska Airlines deal was found by Cheapflights users on 5/4. 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.
Tue 6/27:11 pm
GEG
- BOI
Nonstop1h 06m
Alaska Airlines
Sat 6/62:50 pm
BOI
- GEG
Nonstop1h 08m
Alaska Airlines
Deal found 5/4![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 5/3. 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 6/58:55 am
SEA
- GEG
Nonstop1h 15m
Delta
Sun 6/76:05 am
GEG
- SEA
Nonstop1h 30m
Delta
Deal found 5/3![Delta logo]()
$217
This Southwest deal was found by Cheapflights users on 5/2. 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.
Fri 6/125:30 pm
GEG
- BOI
1 stop5h 45m
Southwest
Mon 6/157:20 pm
BOI
- GEG
1 stop5h 15m
Southwest
Deal found 5/2![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 5/2. 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 5/2312:20 pm
PDX
- BOI
1 stop3h 49m
Delta
Sat 5/306:00 pm
BOI
- PDX
1 stop4h 18m
Delta
Deal found 5/2![Delta logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 5/3. 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.
Tue 6/25:46 pm
PDX
- GEG
1 stop3h 32m
Alaska Airlines
Wed 6/35:00 am
GEG
- PDX
1 stop4h 47m
Alaska Airlines
Deal found 5/3![Alaska Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 5/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:30 pm
GEG
- BOI
1 stop5h 45m
Southwest
Thu 6/187:20 pm
BOI
- GEG
1 stop5h 15m
Southwest
Deal found 5/1![Southwest logo]()
$237
This Delta deal was found by Cheapflights users on 5/3. 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 5/305:30 am
PDX
- BOI
1 stop5h 05m
Delta
Mon 6/110:50 am
BOI
- PDX
1 stop6h 10m
Delta
Deal found 5/3![Delta logo]()
$227
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/95:00 am
SEA
- JAC
1 stop6h 46m
United Airlines
Thu 7/168:00 am
JAC
- SEA
1 stop7h 36m
United Airlines
Deal found 5/6![United Airlines logo]()
$626
This Alaska Airlines deal was found by Cheapflights users on 5/2. 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 6/65:46 pm
PDX
- GEG
1 stop3h 32m
Alaska Airlines
Sun 6/75:00 am
GEG
- PDX
1 stop4h 47m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 5/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:05 pm
SEA
- BOI
1 stop5h 10m
Southwest
Tue 6/163:00 pm
BOI
- SEA
1 stop5h 20m
Southwest
Deal found 5/1![Southwest logo]()
$252
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.
Sat 5/303:30 pm
PDX
- GEG
1 stop5h 43m
Delta
Tue 6/24:15 pm
GEG
- PDX
1 stop3h 09m
Delta
Deal found 5/6![Delta logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 5/2. 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.
Wed 5/275:46 pm
PDX
- GEG
1 stop3h 32m
Alaska Airlines
Sat 5/3012:46 pm
GEG
- PDX
1 stop4h 04m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 5/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2311:05 am
GEG
- BOI
1 stop5h 04m
Delta
Sun 5/246:41 pm
BOI
- GEG
1 stop4h 48m
Delta
Deal found 5/1![Delta logo]()
$237
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/281:04 pm
SEA
- GEG
1 stop5h 27m
Alaska Airlines
Sat 5/306:00 am
GEG
- SEA
Nonstop1h 15m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$240
This Southwest deal was found by Cheapflights users on 5/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/165:25 am
PDX
- BOI
1 stop6h 05m
Southwest
Fri 6/197:20 pm
BOI
- PDX
1 stop5h 00m
Southwest
Deal found 5/1![Southwest logo]()
$267
This Delta deal was found by Cheapflights users on 5/2. 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.
Mon 6/16:10 am
GEG
- BOI
1 stop4h 24m
Delta
Mon 6/810:36 am
BOI
- GEG
1 stop6h 04m
Delta
Deal found 5/2![Delta logo]()
$237
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1310:12 am
SEA
- GEG
1 stop4h 43m
Alaska Airlines
Tue 6/167:45 pm
GEG
- SEA
Nonstop1h 14m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$240
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/285:00 am
GEG
- BOI
1 stop5h 35m
Delta
Tue 6/26:41 pm
BOI
- GEG
1 stop5h 54m
Delta
Deal found 5/5![Delta logo]()
$237
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/164:05 pm
PDX
- BOI
2 stops7h 20m
Southwest
Tue 6/2311:45 am
BOI
- PDX
1 stop5h 55m
Southwest
Deal found 5/5![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 5/1. 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 5/235:40 pm
PDX
- GEG
Nonstop1h 18m
Alaska Airlines
Wed 5/275:00 am
GEG
- PDX
1 stop3h 02m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 5/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/158:45 am
PDX
- BOI
1 stop4h 40m
Southwest
Wed 7/227:55 pm
BOI
- PDX
1 stop3h 30m
Southwest
Deal found 5/1![Southwest logo]()
$295
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/187:03 am
PDX
- GEG
Nonstop1h 10m
Alaska Airlines
Mon 6/225:00 am
GEG
- PDX
Nonstop1h 10m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 5/2. 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 6/55:51 pm
PDX
- GEG
1 stop4h 58m
Delta
Sun 6/76:05 am
GEG
- PDX
1 stop5h 37m
Delta
Deal found 5/2![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 5/4. 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.
Sat 5/306:40 am
SEA
- BOI
1 stop6h 30m
Southwest
Sun 5/316:30 am
BOI
- SEA
1 stop5h 15m
Southwest
Deal found 5/4![Southwest logo]()
$302
Last-minute flights from Washington to IdahoDiscover last-minute flight deals from Washington to Idaho. Data last updated May 6, 2026 and is based on user searches.
Discover last-minute flight deals from Washington to Idaho. Data last updated May 6, 2026 and is based on user searches.
This SmartFares deal was found by Cheapflights users on 5/2. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:20 pm
GEG
- BOI
Nonstop1h 08m
Alaska Airlines
Sun 5/247:00 am
BOI
- GEG
Nonstop1h 07m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$192
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/281:04 pm
SEA
- BOI
Nonstop1h 30m
Alaska Airlines
Mon 6/18:51 pm
BOI
- SEA
Nonstop1h 38m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$134
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:40 am
SEA
- BOI
2 stops11h 10m
Southwest
Mon 6/11:20 pm
BOI
- SEA
1 stop10h 15m
Southwest
Deal found 5/6![Southwest logo]()
$173
This Trip.com deal was found by Cheapflights users on 5/2. 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.
Thu 5/289:29 pm
SEA
- BOI
Nonstop1h 29m
Alaska Airlines
Tue 6/28:51 pm
BOI
- SEA
Nonstop1h 38m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$183
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3010:25 am
SEA
- GEG
Nonstop1h 17m
Alaska Airlines
Sat 5/301:59 pm
GEG
- SEA
Nonstop1h 16m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$192
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:35 pm
SEA
- BOI
1 stop5h 50m
Southwest
Tue 6/97:55 pm
BOI
- SEA
1 stop4h 35m
Southwest
Deal found 5/5![Southwest logo]()
$157
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:35 am
SEA
- BOI
2 stops8h 05m
Southwest
Sat 6/65:10 pm
BOI
- SEA
2 stops8h 25m
Southwest
Deal found 5/5![Southwest logo]()
$167
This United Airlines deal was found by Cheapflights users on 5/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/211:16 am
PDX
- BOI
1 stop4h 28m
United Airlines
Tue 6/97:05 pm
BOI
- PDX
1 stop4h 44m
United Airlines
Deal found 5/3![United Airlines logo]()
$187
This Delta deal was found by Cheapflights users on 5/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:59 pm
SEA
- BOI
Nonstop1h 33m
Delta
Sat 6/66:00 pm
BOI
- SEA
Nonstop1h 40m
Delta
Deal found 5/1![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 5/1. 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.
Wed 6/39:29 pm
SEA
- BOI
Nonstop1h 29m
Alaska Airlines
Mon 6/84:19 pm
BOI
- SEA
Nonstop1h 40m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$187
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:30 am
SEA
- BOI
1 stop5h 00m
Southwest
Fri 6/1212:05 pm
BOI
- SEA
2 stops12h 45m
Southwest
Deal found 5/5![Southwest logo]()
$168
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.
Thu 6/117:15 am
SEA
- BOI
Nonstop1h 41m
Delta
Sun 6/146:43 am
BOI
- SEA
Nonstop1h 52m
Delta
Deal found 5/6![Delta logo]()
$137
One-way flights from Washington to IdahoSearch for one-way flight options from Washington to Idaho. Find affordable one-way fares based on user searches. Data last updated May 6, 2026.
Search for one-way flight options from Washington to Idaho. Find affordable one-way fares based on user searches. Data last updated May 6, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/315:00 am
SEA
- BOI
1 stop3h 55m
Southwest
Deal found 5/5![Southwest logo]()
$79
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/512:45 pm
SEA
- BOI
2 stops10h 30m
Southwest
Deal found 5/5![Southwest logo]()
$84
This Southwest deal was found by Cheapflights users on 5/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/262:35 pm
PDX
- BOI
1 stop7h 55m
Southwest
Deal found 5/1![Southwest logo]()
$94
This Super.com deal was found by Cheapflights users on 5/4. 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.
Sat 5/237:50 pm
SEA
- BOI
1 stop15h 40m
Frontier
Deal found 5/4![Frontier logo]()
$95
This Trip.com deal was found by Cheapflights users on 5/4. 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.
Sun 5/2412:35 pm
PDX
- GEG
1 stop23h 03m
Frontier
Deal found 5/4![Frontier logo]()
$99
This United Airlines deal was found by Cheapflights users on 5/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/273:33 pm
SEA
- BOI
1 stop7h 22m
United Airlines
Deal found 5/1![United Airlines logo]()
$99
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.
Thu 5/289:35 pm
SEA
- GEG
Nonstop1h 16m
Delta
Deal found 5/6![Delta logo]()
$99
This Southwest deal was found by Cheapflights users on 5/3. 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 6/241:30 pm
SEA
- BOI
2 stops9h 55m
Southwest
Deal found 5/3![Southwest logo]()
$104
This Southwest deal was found by Cheapflights users on 5/2. 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.
Sat 5/305:30 am
PDX
- BOI
1 stop8h 20m
Southwest
Deal found 5/2![Southwest logo]()
$104
This CheapOair deal was found by Cheapflights users on 5/4. 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.
Wed 6/1712:31 pm
GEG
- BOI
1 stop22h 59m
Frontier
Deal found 5/4![Frontier logo]()
$106
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:41 pm
SEA
- BOI
1 stop15h 48m
Frontier
Deal found 5/6![Frontier logo]()
$106
This United Airlines deal was found by Cheapflights users on 5/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/255:00 am
SEA
- BOI
1 stop7h 08m
United Airlines
Deal found 5/3![United Airlines logo]()
$109
Find flight deals from Washington to Idaho
Keep the following information in mind while searching for Washington to Idaho flight deals. Data was last updated May 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $134 (Trip.com) |
One-way from | $79 (Southwest) |
Popular in | June |
Cheapest in | January |
Average price | $217 |
Good round-trip deal | $217 or less |
Good one-way deal | $118 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington to Idaho 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 6, 2026.
Use the filters below to find and compare flights from Washington to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleBoise
SEA - BOI
SEABOI
Seattle/Tacoma Intl
Thu 6/11
7:15 am-9:56 am
Nonstop1h 41m
Boise Air Term. Gowen Fld
Sun 6/14
6:43 am-7:35 am
Nonstop1h 52m
$137
SeattleBoise
SEA - BOI
SEABOI
Seattle/Tacoma Intl
Wed 6/3
1:04 pm-3:34 pm
Nonstop1h 30m
Boise Air Term. Gowen Fld
Mon 6/8
6:07 pm-6:52 pm
Nonstop1h 45m
$137
SeattleBoise
SEA - BOI
SEABOI
Seattle/Tacoma Intl
Wed 6/3
8:26 am-11:03 am
Nonstop1h 37m
Boise Air Term. Gowen Fld
Sat 6/6
8:51 pm-9:29 pm
Nonstop1h 38m
$177
PortlandBoise
PDX - BOI
PDXBOI
Portland
Wed 6/3
5:30 am-12:30 pm
1 stop6h 00m
Boise Air Term. Gowen Fld
Wed 6/10
4:20 pm-12:05 am
1 stop8h 45m
$187
SeattleBoise
SEA - BOI
SEABOI
Seattle/Tacoma Intl
Fri 6/12
8:35 am-11:15 am
Nonstop1h 40m
Boise Air Term. Gowen Fld
Fri 6/12
7:53 pm-8:50 pm
Nonstop1h 57m
$197
Quickest round-trip
SpokaneBoise
GEG - BOI
GEGBOI
Spokane
Tue 6/2
7:11 pm-9:17 pm
Nonstop1h 06m
Boise Air Term. Gowen Fld
Sat 6/6
2:50 pm-2:58 pm
Nonstop1h 08m
$217
SeattleSpokane
SEA - GEG
SEAGEG
Seattle/Tacoma Intl
Fri 6/5
8:55 am-10:10 am
Nonstop1h 15m
Spokane
Sun 6/7
6:05 am-7:35 am
Nonstop1h 30m
$217
PortlandBoise
PDX - BOI
PDXBOI
Portland
Sat 5/23
12:20 pm-5:09 pm
1 stop3h 49m
Boise Air Term. Gowen Fld
Sat 5/30
6:00 pm-9:18 pm
1 stop4h 18m
$217
PortlandBoise
PDX - BOI
PDXBOI
Portland
Sat 5/30
5:30 am-11:35 am
1 stop5h 05m
Boise Air Term. Gowen Fld
Mon 6/1
10:50 am-4:00 pm
1 stop6h 10m
$227
PortlandBoise
PDX - BOI
PDXBOI
Portland
Mon 6/8
10:00 am-3:45 pm
1 stop4h 45m
Boise Air Term. Gowen Fld
Thu 6/11
7:40 pm-12:30 am
1 stop5h 50m
$230
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Washington to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Washington with our price prediction graph.
SEA-BOI
PDX-BOI
GEG-BOI
SEA-GEG
PDX-GEG
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 Washington to Idaho
USWA-USID
SEA-BOI
PDX-BOI
GEG-BOI
SEA-GEG
How far ahead should I book a flight from State of Washington to Idaho?
The price you pay for your flight from State of Washington to Idaho may vary depending on when you book. For the best chance of a lower fare, look to book 42 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 State of Washington to Idaho?
Currently, September is the cheapest month in which you can book a flight from State of Washington to Idaho (average of $59). Flying from State of Washington to Idaho in July is currently the most expensive (average of $157). 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 WA to ID?
Find hourly flight availability from Washington to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 6, 2026.
It’s optimal to fly from State of Washington to Idaho in the morning. By choosing this option you can save up to 31% on the cost of your flight, compared to a flight in the evening.
What is the cheapest day to fly from State of Washington to Idaho?
Use this chart to determine the cheapest time to fly round-trip from Washington to Idaho. Price data was last updated on May 2, 2026.
Travelers seeking maximum savings on their State of Washington to Idaho flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from State of Washington to Idaho
Explore weekly flight availability from Washington to Idaho. 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 6, 2026.
The most flights from USWA to USID are scheduled on a Wednesday (35 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).
How much does it cost to fly round-trip from State of Washington to Idaho?
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated May 6, 2026.
Read through reviews of airlines operating flights from Washington to Idaho, such as Alaska Airlines,Delta, andHawaiian Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Overall
7.9
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Overall
7.9
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Overall
7.9
Crew
8.5
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Food
7.1
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Related info for your journey
Find useful and relevant information for your journey from Washington to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Return Flight Options
Top destinations
Alternative routes for Washington to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Washington to Idaho by cabin class
Find flights from Washington to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Washington and Idaho flights
Browse other Washington and Idaho flight options. Last updated on May 6, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Idaho
Find the right flight back to Washington after your stay in Idaho
Washington to Idaho flights
Consider these flights traveling from Washington to Idaho.
Top 3 airlines flying from Washington to Idaho
Discover the top 3 airlines that operate flights from Washington to Idaho. 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 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$79 | Average$431 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$107 | Average$296 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$108 | Average$276 | FlexibilityNo cancel fee | On-time85% |