$109+ Cheap flights from Washington, D.C. (WAS) 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 8/17. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — BOI
Jul 27 — Aug 31
Round-trip
1 adult, Economy
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Cheapest flights from Washington, D.C. to IdahoExplore the most affordable flight options available from Washington, D.C. to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 27, 2026.
Explore the most affordable flight options available from Washington, D.C. to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 27, 2026.
This Delta deal was found by Cheapflights users on 6/23. 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 8/206:49 pm
IAD
- BOI
1 stop7h 10m
Delta
Mon 8/2411:10 pm
BOI
- IAD
1 stop8h 10m
Delta
Deal found 6/23![Delta logo]()
$293
This Delta deal was found by Cheapflights users on 6/23. 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 8/206:05 am
BWI
- BOI
1 stop9h 37m
Delta
Mon 8/2411:10 pm
BOI
- BWI
1 stop8h 09m
Delta
Deal found 6/23![Delta logo]()
$293
This Delta deal was found by Cheapflights users on 6/23. 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 7/47:45 am
DCA
- BOI
1 stop8h 06m
Delta
Tue 7/142:03 pm
BOI
- DCA
1 stop7h 49m
Delta
Deal found 6/23![Delta logo]()
$293
This American Airlines deal was found by Cheapflights users on 6/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/299:07 am
DCA
- GEG
1 stop7h 30m
American Airlines
Sat 9/512:44 pm
GEG
- DCA
1 stop8h 14m
American Airlines
Deal found 6/24![American Airlines logo]()
$295
This Delta deal was found by Cheapflights users on 6/25. 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.
Tue 8/2512:30 pm
BWI
- BOI
2 stops13h 29m
Delta
Thu 8/276:45 pm
BOI
- BWI
1 stop9h 35m
Delta
Deal found 6/25![Delta logo]()
$298
This Delta deal was found by Cheapflights users on 6/23. 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 7/43:04 pm
BWI
- BOI
1 stop8h 08m
Delta
Tue 7/146:42 pm
BOI
- BWI
1 stop9h 18m
Delta
Deal found 6/23![Delta logo]()
$300
This Delta deal was found by Cheapflights users on 6/25. 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 10/292:10 pm
BWI
- BOI
2 stops11h 45m
Delta
Sat 10/3111:30 am
BOI
- BWI
2 stops10h 56m
Delta
Deal found 6/25![Delta logo]()
$303
This Frontier deal was found by Cheapflights users on 6/23. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/137:00 am
DCA
- BOI
1 stop7h 04m
Frontier
Thu 9/2412:59 pm
BOI
- DCA
1 stop6h 59m
Frontier
Deal found 6/23![Frontier logo]()
$303
This Southwest deal was found by Cheapflights users on 6/27. 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 9/13:15 pm
BWI
- GEG
1 stop10h 40m
Southwest
Tue 9/84:55 pm
GEG
- BWI
1 stop10h 40m
Southwest
Deal found 6/27![Southwest logo]()
$307
This Delta deal was found by Cheapflights users on 6/23. 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.
Tue 9/297:45 am
DCA
- GEG
1 stop8h 13m
Delta
Tue 10/62:05 pm
GEG
- DCA
1 stop6h 24m
Delta
Deal found 6/23![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 10/277:00 am
BWI
- BOI
1 stop10h 23m
Alaska Airlines
Wed 10/286:01 pm
BOI
- BWI
1 stop9h 19m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 6/23. 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.
Tue 9/156:20 am
IAD
- GEG
1 stop8h 50m
Delta
Tue 9/226:45 am
GEG
- IAD
1 stop8h 20m
Delta
Deal found 6/23![Delta logo]()
$307
Best flights from Washington, D.C. to IdahoDiscover carefully curated flight deals from Washington, D.C. to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 27, 2026.
Discover carefully curated flight deals from Washington, D.C. to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 27, 2026.
This Delta deal was found by Cheapflights users on 6/25. 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 8/176:05 am
BWI
- BOI
1 stop9h 37m
Delta
Tue 8/256:45 pm
BOI
- BWI
1 stop9h 35m
Delta
Deal found 6/25![Delta logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 10/277:00 am
BWI
- BOI
1 stop10h 23m
Alaska Airlines
Wed 10/286:01 pm
BOI
- BWI
1 stop9h 19m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 6/22. 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 8/115:40 pm
BWI
- GEG
1 stop8h 15m
Southwest
Tue 8/184:55 pm
GEG
- BWI
1 stop10h 40m
Southwest
Deal found 6/22![Southwest logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/27. 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 9/85:26 pm
IAD
- BOI
1 stop7h 37m
United Airlines
Sat 9/1910:36 am
BOI
- IAD
1 stop6h 47m
United Airlines
Deal found 6/27![United Airlines logo]()
$311
This American Airlines deal was found by Cheapflights users on 6/26. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:10 am
IAD
- BOI
2 stops12h 39m
American Airlines
Thu 8/2712:12 pm
BOI
- IAD
1 stop8h 40m
American Airlines
Deal found 6/26![American Airlines logo]()
$387
This Sun Country Air deal was found by Cheapflights users on 6/25. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:00 am
IAD
- BOI
1 stop12h 30m
Sun Country Air
Sun 7/266:55 pm
BOI
- IAD
1 stop15h 20m
Sun Country Air
Deal found 6/25![Sun Country Air logo]()
$445
This Delta deal was found by Cheapflights users on 6/26. 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.
Tue 8/2512:30 pm
BWI
- BOI
2 stops13h 29m
Delta
Thu 8/276:45 pm
BOI
- BWI
1 stop9h 35m
Delta
Deal found 6/26![Delta logo]()
$298
This Alaska Airlines deal was found by Cheapflights users on 6/24. 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 9/227:50 am
BWI
- BOI
1 stop9h 40m
Alaska Airlines
Wed 9/237:48 pm
BOI
- BWI
1 stop8h 42m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$333
This Southwest deal was found by Cheapflights users on 6/23. 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 8/53:15 pm
BWI
- GEG
1 stop10h 40m
Southwest
Thu 8/1310:55 am
GEG
- BWI
1 stop9h 30m
Southwest
Deal found 6/23![Southwest logo]()
$337
This Delta deal was found by Cheapflights users on 6/25. 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 9/56:00 am
IAD
- GEG
1 stop9h 57m
Delta
Sat 9/1211:43 am
GEG
- IAD
1 stop9h 57m
Delta
Deal found 6/25![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 6/27. 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 8/26:15 am
BWI
- GEG
1 stop9h 55m
Southwest
Tue 8/44:55 pm
GEG
- BWI
1 stop10h 40m
Southwest
Deal found 6/27![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 6/24. 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 9/216:15 am
BWI
- GEG
1 stop9h 43m
Delta
Wed 9/305:15 pm
GEG
- BWI
1 stop10h 03m
Delta
Deal found 6/24![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 6/24. 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 9/177:47 pm
IAD
- BOI
1 stop20h 15m
Alaska Airlines
Tue 9/227:20 am
BOI
- IAD
1 stop8h 54m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$341
This Delta deal was found by Cheapflights users on 6/25. 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 8/317:10 am
IAD
- BOI
1 stop10h 08m
Delta
Fri 9/41:59 pm
BOI
- IAD
1 stop8h 35m
Delta
Deal found 6/25![Delta logo]()
$317
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 9/177:00 am
IAD
- BOI
1 stop10h 30m
Alaska Airlines
Wed 9/237:20 am
BOI
- IAD
1 stop8h 54m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$350
This Southwest deal was found by Cheapflights users on 6/22. 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 8/152:45 pm
BWI
- GEG
1 stop9h 40m
Southwest
Fri 8/211:50 pm
GEG
- BWI
1 stop6h 35m
Southwest
Deal found 6/22![Southwest logo]()
$361
This United Airlines deal was found by Cheapflights users on 6/26. 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.
Sat 12/512:40 pm
DCA
- BOI
2 stops13h 19m
United Airlines
Tue 12/811:45 am
BOI
- DCA
1 stop8h 08m
United Airlines
Deal found 6/26![United Airlines logo]()
$438
This Delta deal was found by Cheapflights users on 6/25. 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 11/56:00 am
IAD
- BOI
1 stop8h 39m
Delta
Sun 11/81:43 pm
BOI
- IAD
1 stop8h 37m
Delta
Deal found 6/25![Delta logo]()
$317
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 8/294:43 pm
BWI
- GEG
1 stop9h 28m
Alaska Airlines
Sat 9/55:12 am
GEG
- BWI
1 stop7h 28m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$358
This Sun Country Air deal was found by Cheapflights users on 6/24. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:00 am
IAD
- GEG
1 stop11h 56m
Sun Country Air
Sun 7/266:08 pm
GEG
- IAD
1 stop15h 07m
Sun Country Air
Deal found 6/24![Sun Country Air logo]()
$485
This Southwest deal was found by Cheapflights users on 6/22. 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 8/72:55 pm
BWI
- GEG
2 stops10h 45m
Southwest
Mon 8/103:40 pm
GEG
- BWI
1 stop11h 55m
Southwest
Deal found 6/22![Southwest logo]()
$369
This Delta deal was found by Cheapflights users on 6/25. 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.
Sun 9/66:00 am
IAD
- GEG
1 stop9h 57m
Delta
Sat 9/1211:43 am
GEG
- IAD
1 stop9h 57m
Delta
Deal found 6/25![Delta logo]()
$326
This Alaska Airlines deal was found by Cheapflights users on 6/24. 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 9/155:57 pm
IAD
- GEG
1 stop9h 02m
Alaska Airlines
Tue 9/226:00 am
GEG
- IAD
1 stop9h 14m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$365
This United Airlines deal was found by Cheapflights users on 6/26. 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 7/136:30 am
IAD
- IDA
1 stop8h 55m
United Airlines
Fri 7/174:14 pm
IDA
- IAD
1 stop6h 31m
United Airlines
Deal found 6/26![United Airlines logo]()
$488
This Southwest deal was found by Cheapflights users on 6/25. 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 8/102:00 pm
BWI
- BOI
1 stop8h 40m
Southwest
Mon 8/1712:10 pm
BOI
- BWI
1 stop6h 05m
Southwest
Deal found 6/25![Southwest logo]()
$373
This Delta deal was found by Cheapflights users on 6/22. 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 8/156:00 am
IAD
- GEG
1 stop9h 58m
Delta
Fri 8/2112:36 pm
GEG
- IAD
1 stop8h 58m
Delta
Deal found 6/22![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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 8/2510:59 am
DCA
- BOI
1 stop11h 21m
Alaska Airlines
Wed 8/267:05 am
BOI
- DCA
1 stop10h 55m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$372
This United Airlines deal was found by Cheapflights users on 6/25. 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 7/277:00 am
BWI
- JAC
1 stop8h 48m
United Airlines
Thu 7/302:44 pm
JAC
- BWI
1 stop6h 46m
United Airlines
Deal found 6/25![United Airlines logo]()
$497
This Southwest deal was found by Cheapflights users on 6/22. 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 8/112:40 pm
DCA
- GEG
2 stops10h 45m
Southwest
Tue 8/186:15 am
GEG
- DCA
2 stops9h 10m
Southwest
Deal found 6/22![Southwest logo]()
$377
This Delta deal was found by Cheapflights users on 6/24. 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 8/216:49 pm
IAD
- BOI
1 stop7h 10m
Delta
Sun 8/2311:10 pm
BOI
- IAD
1 stop8h 10m
Delta
Deal found 6/24![Delta logo]()
$341
Last-minute flights from Washington, D.C. to IdahoDiscover last-minute flight deals from Washington, D.C. to Idaho. Data last updated June 27, 2026 and is based on user searches.
Discover last-minute flight deals from Washington, D.C. to Idaho. Data last updated June 27, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/23. 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 7/39:30 am
DCA
- GEG
1 stop6h 48m
Delta
Tue 7/1410:48 pm
GEG
- DCA
1 stop7h 28m
Delta
Deal found 6/23![Delta logo]()
$349
This Delta deal was found by Cheapflights users on 6/23. 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 7/46:00 am
IAD
- BOI
1 stop8h 54m
Delta
Tue 7/142:03 pm
BOI
- IAD
1 stop8h 38m
Delta
Deal found 6/23![Delta logo]()
$293
This Delta deal was found by Cheapflights users on 6/23. 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 7/47:45 am
DCA
- BOI
1 stop8h 06m
Delta
Tue 7/142:03 pm
BOI
- DCA
1 stop7h 49m
Delta
Deal found 6/23![Delta logo]()
$293
This Delta deal was found by Cheapflights users on 6/23. 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 7/43:04 pm
BWI
- BOI
1 stop8h 08m
Delta
Tue 7/146:42 pm
BOI
- BWI
1 stop9h 18m
Delta
Deal found 6/23![Delta logo]()
$300
This Delta deal was found by Cheapflights users on 6/23. 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 7/87:00 am
IAD
- GEG
1 stop8h 11m
Delta
Thu 7/1611:30 am
GEG
- IAD
1 stop9h 38m
Delta
Deal found 6/23![Delta logo]()
$360
This Frontier deal was found by Cheapflights users on 6/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:00 am
DCA
- BOI
1 stop7h 29m
Frontier
Tue 7/281:24 pm
BOI
- DCA
1 stop6h 35m
Frontier
Deal found 6/27![Frontier logo]()
$332
This Expedia deal was found by Cheapflights users on 6/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:00 am
DCA
- BOI
1 stop7h 29m
Frontier
Thu 7/301:24 pm
BOI
- DCA
1 stop6h 35m
Frontier
Deal found 6/25![Frontier logo]()
$363
This Delta deal was found by Cheapflights users on 6/23. 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 7/244:35 pm
DCA
- BOI
1 stop9h 16m
Delta
Tue 7/2811:10 pm
BOI
- DCA
1 stop8h 06m
Delta
Deal found 6/23![Delta logo]()
$337
This American Airlines deal was found by Cheapflights users on 6/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/243:46 pm
BWI
- BOI
1 stop9h 35m
American Airlines
Fri 7/313:10 pm
BOI
- BWI
1 stop7h 23m
American Airlines
Deal found 6/24![American Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 6/27. 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 7/277:30 pm
BWI
- BOI
1 stop7h 45m
Southwest
Mon 8/37:40 pm
BOI
- BWI
1 stop8h 05m
Southwest
Deal found 6/27![Southwest logo]()
$337
This American Airlines deal was found by Cheapflights users on 6/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/287:35 am
DCA
- BOI
1 stop8h 45m
American Airlines
Wed 8/53:21 pm
BOI
- DCA
1 stop6h 38m
American Airlines
Deal found 6/27![American Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 6/23. 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 7/293:45 pm
BWI
- GEG
1 stop11h 05m
Southwest
Sat 8/83:15 pm
GEG
- BWI
1 stop12h 20m
Southwest
Deal found 6/23![Southwest logo]()
$352
One-way flights from Washington, D.C. to IdahoSearch for one-way flight options from Washington, D.C. to Idaho. Find affordable one-way fares based on user searches. Data last updated June 27, 2026.
Search for one-way flight options from Washington, D.C. to Idaho. Find affordable one-way fares based on user searches. Data last updated June 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 8/179:50 am
IAD
- IDA
1 stop8h 15m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$109
This Frontier deal was found by Cheapflights users on 6/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/197:00 am
DCA
- BOI
1 stop7h 29m
Frontier
Deal found 6/24![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 6/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/167:00 am
DCA
- BOI
1 stop7h 29m
Frontier
Deal found 6/26![Frontier logo]()
$127
This Delta deal was found by Cheapflights users on 6/22. 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 7/167:00 am
IAD
- BOI
1 stop10h 11m
Delta
Deal found 6/22![Delta logo]()
$147
This United Airlines deal was found by Cheapflights users on 6/24. 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 9/178:00 am
BWI
- BOI
1 stop9h 31m
United Airlines
Deal found 6/24![United Airlines logo]()
$147
This Delta deal was found by Cheapflights users on 6/24. 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 7/184:45 pm
DCA
- BOI
1 stop8h 13m
Delta
Deal found 6/24![Delta logo]()
$147
This United Airlines deal was found by Cheapflights users on 6/25. 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 8/192:43 pm
IAD
- GEG
1 stop9h 03m
United Airlines
Deal found 6/25![United Airlines logo]()
$148
This United Airlines deal was found by Cheapflights users on 6/25. 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 9/3012:10 pm
BWI
- BOI
2 stops13h 49m
United Airlines
Deal found 6/25![United Airlines logo]()
$152
This United Airlines deal was found by Cheapflights users on 6/25. 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 8/191:04 pm
DCA
- GEG
2 stops12h 32m
United Airlines
Deal found 6/25![United Airlines logo]()
$153
This Southwest deal was found by Cheapflights users on 6/26. 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 8/2710:20 am
BWI
- GEG
1 stop8h 15m
Southwest
Deal found 6/26![Southwest logo]()
$154
This Delta deal was found by Cheapflights users on 6/25. 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 8/197:45 am
DCA
- GEG
1 stop8h 12m
Delta
Deal found 6/25![Delta logo]()
$154
This Delta deal was found by Cheapflights users on 6/22. 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.
Tue 9/226:20 am
IAD
- GEG
1 stop9h 38m
Delta
Deal found 6/22![Delta logo]()
$154
Find flight deals from Washington, D.C. to Idaho
Keep the following information in mind while searching for Washington, D.C. to Idaho flight deals. Data was last updated June 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $293 (Delta) |
One-way from | $109 (Kiwi.com) |
Popular in | December |
Cheapest in | May |
Average price | $392 |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington, D.C. 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 June 27, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BaltimoreBoise
BWI - BOI
BWIBOI
Baltimore/Washington
Mon 8/17
6:05 am-1:42 pm
1 stop9h 37m
Boise Air Term. Gowen Fld
Tue 8/25
6:45 pm-6:20 am
1 stop9h 35m
$293
BaltimoreBoise
BWI - BOI
BWIBOI
Baltimore/Washington
Tue 8/25
12:30 pm-11:59 pm
2 stops13h 29m
Boise Air Term. Gowen Fld
Thu 8/27
6:45 pm-6:20 am
1 stop9h 35m
$298
BaltimoreBoise
BWI - BOI
BWIBOI
Baltimore/Washington
Tue 10/27
7:00 am-3:23 pm
1 stop10h 23m
Boise Air Term. Gowen Fld
Wed 10/28
6:01 pm-5:20 am
1 stop9h 19m
$307
Washington, D.C.Spokane
IAD - GEG
IADGEG
Washington, D.C. Dulles Intl
Sat 9/5
6:00 am-12:57 pm
1 stop9h 57m
Spokane
Sat 9/12
11:43 am-12:40 am
1 stop9h 57m
$307
BaltimoreSpokane
BWI - GEG
BWIGEG
Baltimore/Washington
Tue 8/11
5:40 pm-10:55 pm
1 stop8h 15m
Spokane
Tue 8/18
4:55 pm-6:35 am
1 stop10h 40m
$309
BaltimoreSpokane
BWI - GEG
BWIGEG
Baltimore/Washington
Mon 9/21
6:15 am-12:58 pm
1 stop9h 43m
Spokane
Wed 9/30
5:15 pm-6:18 am
1 stop10h 03m
$309
Quickest round-trip
Washington, D.C.Boise
IAD - BOI
IADBOI
Washington, D.C. Dulles Intl
Tue 9/8
5:26 pm-11:03 pm
1 stop7h 37m
Boise Air Term. Gowen Fld
Sat 9/19
10:36 am-7:23 pm
1 stop6h 47m
$311
Washington, D.C.Boise
IAD - BOI
IADBOI
Washington, D.C. Dulles Intl
Mon 8/31
7:10 am-3:18 pm
1 stop10h 08m
Boise Air Term. Gowen Fld
Fri 9/4
1:59 pm-12:34 am
1 stop8h 35m
$317
Washington, D.C.Boise
IAD - BOI
IADBOI
Washington, D.C. Dulles Intl
Thu 11/5
6:00 am-12:39 pm
1 stop8h 39m
Boise Air Term. Gowen Fld
Sun 11/8
1:43 pm-12:20 am
1 stop8h 37m
$317
Washington, D.C.Spokane
IAD - GEG
IADGEG
Washington, D.C. Dulles Intl
Sun 9/6
6:00 am-12:57 pm
1 stop9h 57m
Spokane
Sat 9/12
11:43 am-12:40 am
1 stop9h 57m
$326
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Washington, D.C. to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Washington, D.C. with our price prediction graph.
DCA-BOI
IAD-BOI
BWI-BOI
IAD-IDA
BWI-JAC
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, D.C. to Idaho
WAS-USID
DCA-BOI
IAD-BOI
BWI-BOI
IAD-IDA
What is the cheapest month to book a flight from Washington, D.C. to Idaho?
Currently, July is the cheapest month in which you can book a flight from Washington, D.C. to Idaho (average of $125). Flying from Washington, D.C. to Idaho in March is currently the most expensive (average of $372). 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.
How much does it cost to fly round-trip from Washington, D.C. to Idaho?
How far ahead should I book a flight from Washington, D.C. to Idaho?
The best time to book flights from Washington, D.C. to Idaho is 55 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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 June 27, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, andDelta from Washington, D.C. to Idaho. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.9
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Crew
8.5
Reviews
1 / 20
8.0
ExcellentPhally,Oct 2024
IAD - SFO
Overall
7.9
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Crew
8.5
Reviews
1 / 20
8.0
ExcellentPhally,Oct 2024
IAD - SFO
Overall
7.9
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Crew
8.5
Reviews
1 / 20
8.0
ExcellentPhally,Oct 2024
IAD - SFO
Overall
7.9
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Crew
8.5
Reviews
1 / 20
8.0
ExcellentPhally,Oct 2024
IAD - SFO
Overall
7.9
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Crew
8.5
Reviews
1 / 20
8.0
ExcellentPhally,Oct 2024
IAD - SFO
Overall
7.9
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.0
Crew
8.5
Reviews
1 / 20
8.0
ExcellentPhally,Oct 2024
IAD - SFO
Related info for your journey
Find useful and relevant information for your journey from Washington, D.C. to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Washington, D.C. to Idaho
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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, D.C. to Idaho by cabin class
Find flights from Washington, D.C. to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Washington, D.C. and Idaho flights
Browse other Washington, D.C. and Idaho flight options. Last updated on June 27, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Washington, D.C. to Idaho flights
Consider these flights traveling from Washington, D.C. to Idaho.
Top 5 airlines flying from Washington, D.C. to Idaho
Discover the top 5 airlines that operate flights from Washington, D.C. 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 June 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$150 | Average$369 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$221 | Average$613 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$262 | Average$578 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$274 | Average$506 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$327 | Average$510 | FlexibilityNo cancel fee | On-time63% |