$89+ Cheap flights from Ontario (ONT) 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Jun 9 — Jun 161
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Idaho with Cheapflights
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Cheapest flights from Ontario to IdahoExplore the most affordable flight options available from Ontario to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 10, 2026.
Explore the most affordable flight options available from Ontario to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 10, 2026.
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 5/277:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Tue 6/24:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$157
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/23:45 pm
ONT
- BOI
1 stop6h 35m
Southwest
Sat 6/66:05 am
BOI
- ONT
1 stop3h 35m
Southwest
Deal found 5/8![Southwest logo]()
$177
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 6/1012:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/6![Frontier logo]()
$190
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
ONT
- BOI
1 stop5h 09m
Frontier
Tue 9/11:04 pm
BOI
- ONT
1 stop11h 45m
Frontier
Deal found 5/7![Frontier logo]()
$191
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.
Thu 6/411:51 am
ONT
- GEG
1 stop8h 06m
Multiple Airlines
Sun 6/78:47 pm
GEG
- ONT
1 stop22h 45m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$197
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:25 pm
ONT
- BOI
1 stop5h 30m
Southwest
Wed 6/37:05 am
BOI
- ONT
1 stop4h 20m
Southwest
Deal found 5/8![Southwest logo]()
$197
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/21:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/6![Frontier logo]()
$200
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/112:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/6![Frontier logo]()
$204
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
ONT
- BOI
1 stop5h 09m
Frontier
Thu 8/271:04 pm
BOI
- ONT
1 stop11h 45m
Frontier
Deal found 5/7![Frontier logo]()
$205
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 6/1712:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/7![Frontier logo]()
$210
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:34 pm
ONT
- IDA
1 stop18h 13m
Multiple Airlines
Mon 8/318:33 pm
IDA
- ONT
1 stop19h 36m
Multiple Airlines
Deal found 5/6![Multiple Airlines logo]()
$212
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.
Thu 8/1311:43 am
ONT
- GEG
1 stop8h 41m
Multiple Airlines
Sun 8/169:14 pm
GEG
- ONT
1 stop22h 39m
Multiple Airlines
Deal found 5/7![Multiple Airlines logo]()
$216
Best flights from Ontario to IdahoDiscover carefully curated flight deals from Ontario to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 10, 2026.
Discover carefully curated flight deals from Ontario to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 10, 2026.
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.
Mon 6/14:25 pm
ONT
- BOI
1 stop5h 30m
Southwest
Tue 6/96:30 am
BOI
- ONT
1 stop4h 05m
Southwest
Deal found 5/6![Southwest logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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 6/27:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 6/64:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$207
This Delta deal was found by Cheapflights users on 5/10. 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 10/165:05 pm
ONT
- BOI
1 stop5h 59m
Delta
Mon 10/196:00 am
BOI
- ONT
1 stop6h 16m
Delta
Deal found 5/10![Delta logo]()
$297
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/35:00 am
ONT
- WYS
1 stop7h 20m
United Airlines
Sat 10/102:02 pm
WYS
- ONT
1 stop7h 50m
United Airlines
Deal found 5/7![United Airlines logo]()
$345
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:25 pm
ONT
- BOI
1 stop5h 30m
Southwest
Wed 6/37:05 am
BOI
- ONT
1 stop4h 20m
Southwest
Deal found 5/8![Southwest logo]()
$197
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/295:05 pm
ONT
- BOI
2 stops6h 55m
Southwest
Mon 6/16:30 am
BOI
- ONT
1 stop4h 55m
Southwest
Deal found 5/7![Southwest logo]()
$222
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.
Tue 8/184:18 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Sun 8/233:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$277
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.
Tue 6/97:20 pm
ONT
- BOI
1 stop4h 10m
Southwest
Tue 6/165:30 am
BOI
- ONT
2 stops7h 00m
Southwest
Deal found 5/6![Southwest logo]()
$242
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 9/35:05 pm
ONT
- BOI
1 stop5h 51m
Delta
Sun 9/66:00 am
BOI
- ONT
1 stop6h 14m
Delta
Deal found 5/6![Delta logo]()
$297
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.
Tue 6/26:00 am
ONT
- GEG
1 stop16h 36m
Alaska Airlines
Sat 6/66:00 am
GEG
- ONT
1 stop5h 10m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$283
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.
Wed 6/33:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Wed 6/106:00 am
BOI
- ONT
2 stops7h 25m
Southwest
Deal found 5/5![Southwest logo]()
$247
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:43 am
ONT
- SUN
1 stop4h 00m
Delta
Sat 8/297:20 am
SUN
- ONT
1 stop5h 45m
Delta
Deal found 5/7![Delta logo]()
$299
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:06 pm
ONT
- BOI
1 stop5h 53m
Delta
Fri 8/286:00 am
BOI
- ONT
1 stop3h 48m
Delta
Deal found 5/7![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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 7/44:18 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Tue 7/146:13 pm
BOI
- ONT
1 stop5h 58m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$327
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.
Sat 5/231:40 pm
ONT
- JAC
1 stop6h 50m
United Airlines
Sat 5/308:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 5/6![United Airlines logo]()
$409
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.
Wed 5/209:50 am
ONT
- SUN
1 stop3h 44m
Delta
Sat 5/3012:39 pm
SUN
- ONT
1 stop4h 38m
Delta
Deal found 5/6![Delta logo]()
$314
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 6/105:54 pm
ONT
- GEG
1 stop14h 32m
Alaska Airlines
Sun 6/146:13 am
GEG
- ONT
1 stop4h 58m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$333
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.
Mon 6/86:35 pm
ONT
- BOI
2 stops5h 35m
Southwest
Thu 6/116:00 am
BOI
- ONT
2 stops7h 10m
Southwest
Deal found 5/5![Southwest logo]()
$318
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ONT
- JAC
1 stop3h 48m
Delta
Sat 5/305:59 pm
JAC
- ONT
1 stop5h 46m
Delta
Deal found 5/9![Delta logo]()
$329
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:00 am
ONT
- WYS
1 stop7h 20m
United Airlines
Sun 8/232:02 pm
WYS
- ONT
1 stop7h 50m
United Airlines
Deal found 5/5![United Airlines logo]()
$449
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- IDA
1 stop8h 26m
Alaska Airlines
Thu 5/286:00 am
IDA
- ONT
1 stop6h 10m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$339
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.
Wed 6/39:50 am
ONT
- GEG
2 stops8h 53m
Delta
Wed 6/109:20 am
GEG
- ONT
1 stop7h 59m
Delta
Deal found 5/5![Delta logo]()
$338
This United Airlines deal was found by Cheapflights users on 5/10. 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 8/251:18 pm
ONT
- SUN
1 stop6h 54m
United Airlines
Sat 8/298:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 5/10![United Airlines logo]()
$453
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.
Tue 6/24:03 pm
ONT
- GEG
1 stop5h 15m
Alaska Airlines
Wed 6/36:00 am
GEG
- ONT
1 stop5h 12m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$353
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 6/94:10 pm
ONT
- GEG
2 stops7h 55m
Southwest
Fri 6/122:15 pm
GEG
- ONT
2 stops7h 55m
Southwest
Deal found 5/5![Southwest logo]()
$368
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/221:50 pm
ONT
- SUN
1 stop7h 01m
United Airlines
Mon 5/257:00 am
SUN
- ONT
1 stop6h 47m
United Airlines
Deal found 5/8![United Airlines logo]()
$474
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.
Thu 7/302:05 pm
ONT
- GEG
1 stop6h 51m
Alaska Airlines
Tue 8/46:13 am
GEG
- ONT
1 stop6h 56m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$361
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/811:55 am
ONT
- GEG
1 stop5h 04m
Delta
Tue 8/113:59 pm
GEG
- ONT
1 stop6h 46m
Delta
Deal found 5/9![Delta logo]()
$361
This Southwest deal was found by Cheapflights users on 5/10. 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 6/104:10 pm
ONT
- GEG
2 stops7h 55m
Southwest
Wed 6/175:15 pm
GEG
- ONT
1 stop4h 00m
Southwest
Deal found 5/10![Southwest logo]()
$382
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/247:00 am
ONT
- IDA
1 stop5h 06m
Alaska Airlines
Tue 6/301:43 pm
IDA
- ONT
1 stop10h 28m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$364
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated May 10, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated May 10, 2026 and is based on user searches.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/226:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 5/2712:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/5![Frontier logo]()
$220
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/21:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/6![Frontier logo]()
$200
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Thu 5/281:25 pm
BOI
- ONT
1 stop21h 40m
Frontier
Deal found 5/6![Frontier logo]()
$220
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 5/277:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Tue 6/24:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$157
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/112:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/6![Frontier logo]()
$204
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.
Wed 5/277:41 pm
ONT
- BOI
1 stop14h 22m
Alaska Airlines
Wed 6/34:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$210
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:25 pm
ONT
- BOI
1 stop5h 30m
Southwest
Wed 6/37:05 am
BOI
- ONT
1 stop4h 20m
Southwest
Deal found 5/8![Southwest logo]()
$197
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/15:30 pm
ONT
- BOI
1 stop4h 25m
Southwest
Thu 6/46:00 am
BOI
- ONT
1 stop5h 10m
Southwest
Deal found 5/7![Southwest logo]()
$217
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/23:45 pm
ONT
- BOI
1 stop6h 35m
Southwest
Sat 6/66:05 am
BOI
- ONT
1 stop3h 35m
Southwest
Deal found 5/8![Southwest logo]()
$177
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 6/1012:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/6![Frontier logo]()
$190
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.
Thu 6/411:51 am
ONT
- GEG
1 stop8h 06m
Multiple Airlines
Sun 6/78:47 pm
GEG
- ONT
1 stop22h 45m
Multiple Airlines
Deal found 5/5![Multiple Airlines logo]()
$197
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/126:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 6/1712:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/7![Frontier logo]()
$210
One-way flights from Ontario to IdahoSearch for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated May 10, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated May 10, 2026.
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:20 pm
ONT
- BOI
1 stop5h 00m
Southwest
Deal found 5/7![Southwest logo]()
$89
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:00 am
ONT
- GEG
1 stop5h 37m
Frontier
Deal found 5/9![Frontier logo]()
$95
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
- BOI
1 stop5h 09m
Frontier
Deal found 5/5![Frontier logo]()
$95
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2510:50 am
ONT
- GEG
1 stop24h 43m
Frontier
Deal found 5/8![Frontier logo]()
$105
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.
Tue 5/266:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/6![Frontier logo]()
$105
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:49 am
ONT
- BOI
1 stop24h 40m
Frontier
Deal found 5/8![Frontier logo]()
$106
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$109
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/295:05 pm
ONT
- BOI
2 stops6h 55m
Southwest
Deal found 5/7![Southwest logo]()
$114
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Deal found 5/6![Frontier logo]()
$115
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/216:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/8![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 5/10. 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 8/26:00 am
ONT
- BOI
1 stop5h 29m
Frontier
Deal found 5/10![Frontier logo]()
$116
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2810:50 am
ONT
- GEG
1 stop24h 48m
Frontier
Deal found 5/6![Frontier logo]()
$119
Find flight deals from Ontario to Idaho
Keep the following information in mind while searching for Ontario to Idaho flight deals. Data was last updated May 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $157 (Alaska Airlines) |
One-way from | $89 (Southwest) |
Popular in | February |
Cheapest in | April |
Average price | $277 |
Good round-trip deal | $157 or less |
Good one-way deal | $138 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario 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 10, 2026.
Use the filters below to find and compare flights from Ontario to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Mon 6/1
4:25 pm-10:55 pm
1 stop5h 30m
Boise Air Term. Gowen Fld
Tue 6/9
6:30 am-9:35 am
1 stop4h 05m
$197
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Mon 6/1
4:25 pm-10:55 pm
1 stop5h 30m
Boise Air Term. Gowen Fld
Wed 6/3
7:05 am-10:25 am
1 stop4h 20m
$197
Quickest round-trip
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 6/2
7:48 pm-10:47 pm
Nonstop1h 59m
Boise Air Term. Gowen Fld
Sat 6/6
4:14 pm-5:17 pm
Nonstop2h 03m
$207
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 5/29
5:05 pm-1:00 am
2 stops6h 55m
Boise Air Term. Gowen Fld
Mon 6/1
6:30 am-10:25 am
1 stop4h 55m
$222
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 6/9
7:20 pm-12:30 am
1 stop4h 10m
Boise Air Term. Gowen Fld
Tue 6/16
5:30 am-11:30 am
2 stops7h 00m
$242
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 6/3
3:45 pm-12:25 am
2 stops7h 40m
Boise Air Term. Gowen Fld
Wed 6/10
6:00 am-12:25 pm
2 stops7h 25m
$247
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 8/18
4:18 pm-7:13 pm
Nonstop1h 55m
Boise Air Term. Gowen Fld
Sun 8/23
3:02 pm-4:10 pm
Nonstop2h 08m
$277
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Tue 6/2
6:00 am-10:36 pm
1 stop16h 36m
Spokane
Sat 6/6
6:00 am-11:10 am
1 stop5h 10m
$283
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 10/16
5:05 pm-12:04 am
1 stop5h 59m
Boise Air Term. Gowen Fld
Mon 10/19
6:00 am-11:16 am
1 stop6h 16m
$297
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Thu 9/3
5:05 pm-11:56 pm
1 stop5h 51m
Boise Air Term. Gowen Fld
Sun 9/6
6:00 am-11:14 am
1 stop6h 14m
$297
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Ontario with our price prediction graph.
ONT-BOI
ONT-GEG
ONT-IDA
ONT-SUN
ONT-WYS
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 Ontario to Idaho
ONT-USID
ONT-BOI
ONT-GEG
ONT-IDA
ONT-SUN
How far ahead should I book a flight from Ontario to Idaho?
To ensure you get the cheapest price possible for a flight from Ontario to Idaho, you should look to book at least 27 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Ontario to Idaho?
Currently, January is the cheapest month in which you can book a flight from Ontario to Idaho (average of $97). Flying from Ontario to Idaho in November is currently the most expensive (average of $196). 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 ONT to ID?
Find hourly flight availability from Ontario 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 10, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to Idaho at noon. If you’re flexible enough to do this you can expect to save up to 62% on your trip compared to booking a flight in the morning.
How much does it cost to fly round-trip from Ontario 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 10, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, andDelta from Ontario to Idaho have to say. 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.
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Overall
7.9
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Related info for your journey
Find useful and relevant information for your journey from Ontario 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.
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Alternative routes for Ontario 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 Ontario to Idaho by cabin class
Find flights from Ontario to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Idaho flights
Browse other Ontario and Idaho flight options. Last updated on May 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Idaho flights
Consider these flights traveling from Ontario to Idaho.
Top 4 airlines flying from Ontario to Idaho
Discover the top 4 airlines that operate flights from Ontario 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 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$255 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$153 | Average$321 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$176 | Average$359 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$315 | FlexibilityNo cancel fee | On-time69% |