$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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Jun 15 — Jun 221
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 16, 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 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/67:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Mon 6/84:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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.
Fri 6/57:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Mon 6/84:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$197
This Frontier deal was found by Cheapflights users on 5/12. 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 8/276:00 am
ONT
- BOI
1 stop5h 09m
Frontier
Tue 9/11:04 pm
BOI
- ONT
1 stop11h 45m
Frontier
Deal found 5/12![Frontier logo]()
$204
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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 5/11![Alaska Airlines logo]()
$207
This Frontier deal was found by Cheapflights users on 5/14. 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 7/296:00 am
ONT
- GEG
1 stop5h 37m
Frontier
Mon 8/312:32 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/14![Frontier logo]()
$209
This Frontier deal was found by Cheapflights users on 5/12. 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 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/812:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/12![Frontier logo]()
$210
This Mytrip deal was found by Cheapflights users on 5/15. 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.
Sun 8/910:49 am
ONT
- GEG
1 stop24h 48m
Frontier
Wed 8/1212:34 pm
GEG
- ONT
1 stop21h 29m
Frontier
Deal found 5/15![Frontier logo]()
$219
This Frontier deal was found by Cheapflights users on 5/14. 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.
Mon 6/16:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Fri 6/512:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/14![Frontier logo]()
$220
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/67:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Wed 6/102:31 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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.
Fri 6/57:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 6/64:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$227
This Frontier deal was found by Cheapflights users on 5/13. 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 5/296:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/112:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/13![Frontier logo]()
$230
This Expedia deal was found by Cheapflights users on 5/12. 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 6/96:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/161:25 pm
BOI
- ONT
1 stop21h 40m
Frontier
Deal found 5/12![Frontier logo]()
$230
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 16, 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 16, 2026.
This Frontier deal was found by Cheapflights users on 5/16. 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 7/76:00 am
ONT
- BOI
1 stop5h 29m
Frontier
Sun 7/121:25 pm
BOI
- ONT
1 stop11h 25m
Frontier
Deal found 5/16![Frontier logo]()
$273
This Alaska Airlines deal was found by Cheapflights users on 5/15. 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 7/154:18 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Wed 7/222:31 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 5/15![Alaska Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 5/13. 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 8/206:00 am
ONT
- BOI
1 stop5h 10m
Delta
Sun 8/236:44 pm
BOI
- ONT
1 stop5h 50m
Delta
Deal found 5/13![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 5/13. 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 7/213:30 pm
ONT
- BOI
2 stops7h 55m
Southwest
Thu 7/235:10 am
BOI
- ONT
1 stop7h 10m
Southwest
Deal found 5/13![Southwest logo]()
$336
This United Airlines deal was found by Cheapflights users on 5/14. 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 7/181:50 pm
ONT
- BOI
1 stop5h 15m
United Airlines
Sat 7/256:30 am
BOI
- ONT
1 stop6h 42m
United Airlines
Deal found 5/14![United Airlines logo]()
$368
This Kiwi.com deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/1511:58 am
ONT
- IDA
2 stops9h 08m
Multiple Airlines
Mon 6/2210:56 pm
IDA
- ONT
1 stop17h 12m
Multiple Airlines
Deal found 5/16![Multiple Airlines logo]()
$458
This Delta deal was found by Cheapflights users on 5/11. 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 7/201:00 pm
ONT
- BOI
1 stop3h 51m
Delta
Thu 7/236:42 pm
BOI
- ONT
1 stop6h 06m
Delta
Deal found 5/11![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 8/263:05 pm
ONT
- IDA
1 stop6h 51m
Alaska Airlines
Thu 10/14:14 pm
IDA
- ONT
1 stop5h 10m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 5/15. 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 6/266:30 pm
ONT
- BOI
1 stop4h 45m
Southwest
Mon 6/297:40 pm
BOI
- ONT
1 stop4h 50m
Southwest
Deal found 5/15![Southwest logo]()
$337
This Delta deal was found by Cheapflights users on 5/12. 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 6/101:00 pm
ONT
- BOI
1 stop3h 52m
Delta
Fri 6/126:42 pm
BOI
- ONT
1 stop6h 07m
Delta
Deal found 5/12![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 11/104:09 pm
ONT
- IDA
1 stop6h 33m
Alaska Airlines
Sat 11/141:53 pm
IDA
- ONT
1 stop5h 35m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$319
This Southwest deal was found by Cheapflights users on 5/12. 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 7/209:45 am
ONT
- BOI
1 stop5h 00m
Southwest
Thu 7/236:00 am
BOI
- ONT
2 stops6h 20m
Southwest
Deal found 5/12![Southwest logo]()
$342
This United Airlines deal was found by Cheapflights users on 5/15. 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 6/21:18 pm
ONT
- BOI
1 stop7h 17m
United Airlines
Sat 6/67:05 pm
BOI
- ONT
1 stop4h 45m
United Airlines
Deal found 5/15![United Airlines logo]()
$377
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 8/263:05 pm
ONT
- IDA
1 stop6h 51m
Alaska Airlines
Wed 9/304:14 pm
IDA
- ONT
1 stop5h 10m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 5/14. 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 6/16:00 am
ONT
- SUN
1 stop4h 57m
Delta
Tue 6/27:30 am
SUN
- ONT
1 stop5h 49m
Delta
Deal found 5/14![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 5/16. 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.
Fri 9/184:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Mon 9/211:29 pm
BOI
- ONT
1 stop4h 49m
Alaska Airlines
Deal found 5/16![Alaska Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 5/15. 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 8/11:00 pm
ONT
- JAC
1 stop4h 54m
Delta
Tue 8/46:01 pm
JAC
- ONT
1 stop6h 33m
Delta
Deal found 5/15![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 5/11. 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 6/258:45 pm
ONT
- GEG
1 stop4h 35m
Southwest
Tue 6/305:00 am
GEG
- ONT
2 stops7h 25m
Southwest
Deal found 5/11![Southwest logo]()
$366
This United Airlines deal was found by Cheapflights users on 5/15. 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 5/305:00 am
ONT
- WYS
1 stop7h 32m
United Airlines
Tue 6/22:19 pm
WYS
- ONT
1 stop7h 27m
United Airlines
Deal found 5/15![United Airlines logo]()
$404
This Delta deal was found by Cheapflights users on 5/16. 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 7/181:00 pm
ONT
- JAC
1 stop4h 54m
Delta
Tue 7/216:05 pm
JAC
- ONT
1 stop6h 43m
Delta
Deal found 5/16![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 5/14. 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 7/211:50 pm
ONT
- JAC
1 stop6h 40m
United Airlines
Wed 7/298:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 5/14![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 5/16. 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.
Mon 9/146:00 am
ONT
- GEG
1 stop6h 39m
Alaska Airlines
Mon 9/143:34 pm
GEG
- ONT
1 stop7h 50m
Alaska Airlines
Deal found 5/16![Alaska Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 5/11. 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 7/28:45 pm
ONT
- GEG
1 stop4h 35m
Southwest
Tue 7/75:35 am
GEG
- ONT
1 stop4h 00m
Southwest
Deal found 5/11![Southwest logo]()
$394
This Delta deal was found by Cheapflights users on 5/15. 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 5/296:00 am
ONT
- WYS
1 stop5h 25m
Delta
Thu 6/41:10 pm
WYS
- ONT
2 stops10h 22m
Delta
Deal found 5/15![Delta logo]()
$334
This United Airlines deal was found by Cheapflights users on 5/13. 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 6/81:50 pm
ONT
- JAC
1 stop6h 40m
United Airlines
Mon 6/158:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 5/13![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 5/16. 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 6/134:18 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Wed 6/174:21 pm
BOI
- ONT
1 stop7h 50m
Alaska Airlines
Deal found 5/16![Alaska Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 5/16. 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 7/254:55 pm
ONT
- GEG
2 stops7h 10m
Southwest
Sat 8/156:15 am
GEG
- ONT
2 stops9h 00m
Southwest
Deal found 5/16![Southwest logo]()
$407
This Delta deal was found by Cheapflights users on 5/14. 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
- IDA
1 stop4h 14m
Delta
Mon 10/196:45 pm
IDA
- ONT
1 stop6h 03m
Delta
Deal found 5/14![Delta logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 8/267:10 am
ONT
- IDA
1 stop4h 56m
Alaska Airlines
Tue 9/296:18 am
IDA
- ONT
1 stop5h 58m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 5/16. 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 7/141:50 pm
ONT
- JAC
1 stop6h 40m
United Airlines
Tue 7/218:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 5/16![United Airlines logo]()
$451
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated May 16, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated May 16, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 5/13. 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 5/296:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/112:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/13![Frontier logo]()
$230
This Frontier deal was found by Cheapflights users on 5/14. 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.
Mon 6/16:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Fri 6/512:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/14![Frontier logo]()
$220
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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 5/11![Alaska Airlines logo]()
$207
This Frontier deal was found by Cheapflights users on 5/12. 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 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/812:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/12![Frontier logo]()
$210
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/37:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Mon 6/84:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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.
Fri 6/57:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Mon 6/84:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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.
Fri 6/57:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 6/64:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$227
This CheapOair deal was found by Cheapflights users on 5/15. 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.
Fri 6/56:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Mon 6/812:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 5/15![Frontier logo]()
$234
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/67:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Mon 6/84:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/67:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Wed 6/102:31 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$222
This Delta deal was found by Cheapflights users on 5/13. 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 6/65:55 pm
ONT
- BOI
1 stop4h 09m
Delta
Sun 6/711:59 am
BOI
- ONT
1 stop5h 42m
Delta
Deal found 5/13![Delta logo]()
$231
This Expedia deal was found by Cheapflights users on 5/12. 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 6/96:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/161:25 pm
BOI
- ONT
1 stop21h 40m
Frontier
Deal found 5/12![Frontier logo]()
$230
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 16, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated May 16, 2026.
This Southwest deal was found by Cheapflights users on 5/13. 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 6/96:35 pm
ONT
- BOI
1 stop4h 50m
Southwest
Deal found 5/13![Southwest logo]()
$89
This Super.com deal was found by Cheapflights users on 5/13. 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 6/26:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/13![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 5/16. 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 8/266:00 am
ONT
- GEG
1 stop5h 33m
Frontier
Deal found 5/16![Frontier logo]()
$95
This Travelocity deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/166:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/12![Frontier logo]()
$95
This Frontier deal was found by Cheapflights users on 5/12. 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.
Mon 7/66:00 am
ONT
- GEG
1 stop5h 37m
Frontier
Deal found 5/12![Frontier logo]()
$105
This CheapOair deal was found by Cheapflights users on 5/13. 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.
Tue 8/2510:50 am
ONT
- GEG
1 stop24h 43m
Frontier
Deal found 5/13![Frontier logo]()
$106
This Booking.com deal was found by Cheapflights users on 5/12. 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 5/12![Frontier logo]()
$106
This Frontier deal was found by Cheapflights users on 5/12. 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 7/76:00 am
ONT
- BOI
1 stop5h 29m
Frontier
Deal found 5/12![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 5/15. 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 7/166:00 am
ONT
- BOI
1 stop5h 29m
Frontier
Deal found 5/15![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 5/15. 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 8/216:00 am
ONT
- GEG
1 stop5h 33m
Frontier
Deal found 5/15![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 5/12. 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 7/26:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/12![Frontier logo]()
$115
This CheapOair deal was found by Cheapflights users on 5/12. 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.
Sun 7/510:49 am
ONT
- GEG
1 stop24h 48m
Frontier
Deal found 5/12![Frontier logo]()
$116
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 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $177 (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 16, 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
Tue 7/7
6:00 am-12:29 pm
1 stop5h 29m
Boise Air Term. Gowen Fld
Sun 7/12
1:25 pm-11:50 pm
1 stop11h 25m
$273
Quickest round-trip
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 7/15
4:18 pm-7:13 pm
Nonstop1h 55m
Boise Air Term. Gowen Fld
Wed 7/22
2:31 pm-3:38 pm
Nonstop2h 07m
$287
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Thu 8/20
6:00 am-12:10 pm
1 stop5h 10m
Boise Air Term. Gowen Fld
Sun 8/23
6:44 pm-11:34 pm
1 stop5h 50m
$307
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Mon 7/20
1:00 pm-5:51 pm
1 stop3h 51m
Boise Air Term. Gowen Fld
Thu 7/23
6:42 pm-11:48 pm
1 stop6h 06m
$307
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 6/10
1:00 pm-5:52 pm
1 stop3h 52m
Boise Air Term. Gowen Fld
Fri 6/12
6:42 pm-11:49 pm
1 stop6h 07m
$307
OntarioIdaho Falls
ONT - IDA
ONTIDA
Ontario
Wed 8/26
3:05 pm-10:56 pm
1 stop6h 51m
Idaho Falls Fanning Field
Thu 10/1
4:14 pm-8:24 pm
1 stop5h 10m
$319
OntarioIdaho Falls
ONT - IDA
ONTIDA
Ontario
Tue 11/10
4:09 pm-11:42 pm
1 stop6h 33m
Idaho Falls Fanning Field
Sat 11/14
1:53 pm-6:28 pm
1 stop5h 35m
$319
OntarioIdaho Falls
ONT - IDA
ONTIDA
Ontario
Wed 8/26
3:05 pm-10:56 pm
1 stop6h 51m
Idaho Falls Fanning Field
Wed 9/30
4:14 pm-8:24 pm
1 stop5h 10m
$319
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 9/18
4:50 pm-7:45 pm
Nonstop1h 55m
Boise Air Term. Gowen Fld
Mon 9/21
1:29 pm-5:18 pm
1 stop4h 49m
$327
OntarioHailey
ONT - SUN
ONTSUN
Ontario
Mon 6/1
6:00 am-11:57 am
1 stop4h 57m
Hailey Sun Valley-Friedman
Tue 6/2
7:30 am-12:19 pm
1 stop5h 49m
$329
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-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 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 29 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, May is the cheapest month in which you can book a flight from Ontario to Idaho (average of $79). 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 16, 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.
Weekly flight availability from Ontario to Idaho
Explore weekly flight availability from Ontario 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 16, 2026.
The most flights from ONT to USID are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).
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 16, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, 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
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Overall
8.0
Food
7.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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 16, 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 16, 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% |