$70+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
May 21 — May 281
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 April 21, 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 April 21, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/267:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Wed 6/34:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/261:35 pm
ONT
- BOI
1 stop5h 59m
Delta
Wed 6/312:55 pm
BOI
- ONT
1 stop4h 22m
Delta
Deal found 4/20![Delta logo]()
$167
This Southwest deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/302:50 pm
ONT
- BOI
1 stop6h 15m
Southwest
Tue 6/26:40 am
BOI
- ONT
2 stops5h 55m
Southwest
Deal found 4/19![Southwest logo]()
$172
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/122:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 5/164:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$177
This Frontier deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/316:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Sun 6/71:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 4/20![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” 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 5/246:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Thu 5/281:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 4/21![Frontier logo]()
$181
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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.
Sun 5/247:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 5/304:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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.
Sun 5/313:30 pm
ONT
- TWF
1 stop19h 30m
Multiple Airlines
Fri 6/51:45 pm
TWF
- ONT
1 stop6h 47m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$188
This CheapOair deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Fri 5/2912:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 4/19![Frontier logo]()
$191
This Expedia deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/122:59 pm
ONT
- BOI
Nonstop2h 00m
Multiple Airlines
Sun 5/171:22 pm
BOI
- ONT
1 stop21h 43m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$194
This CheapOair deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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 5/226:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 5/2712:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 4/17![Frontier logo]()
$196
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/281:35 pm
ONT
- BOI
1 stop5h 59m
Delta
Sat 5/305:45 am
BOI
- ONT
1 stop6h 27m
Delta
Deal found 4/20![Delta logo]()
$197
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 April 21, 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 April 21, 2026.
This Delta deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/301:35 pm
ONT
- BOI
1 stop5h 59m
Delta
Mon 6/16:00 pm
BOI
- ONT
1 stop5h 32m
Delta
Deal found 4/17![Delta logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” 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 5/197:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Tue 5/264:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/21![Alaska Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/124:30 pm
ONT
- GEG
2 stops6h 15m
Southwest
Sat 5/166:45 am
GEG
- ONT
1 stop7h 25m
Southwest
Deal found 4/18![Southwest logo]()
$319
This United Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- GEG
1 stop4h 27m
United Airlines
Fri 5/296:00 am
GEG
- ONT
1 stop6h 12m
United Airlines
Deal found 4/18![United Airlines logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” 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 4/3012:59 am
ONT
- TWF
2 stops10h 01m
Multiple Airlines
Mon 5/41:40 pm
TWF
- ONT
1 stop27h 04m
Multiple Airlines
Deal found 4/19![Multiple Airlines logo]()
$530
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/256:00 am
ONT
- SUN
1 stop4h 57m
Delta
Wed 6/37:30 am
SUN
- ONT
1 stop5h 49m
Delta
Deal found 4/20![Delta logo]()
$289
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 6/87:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Tue 7/282:31 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 7/156:01 pm
ONT
- BOI
1 stop4h 52m
Delta
Wed 7/226:42 pm
BOI
- ONT
1 stop6h 02m
Delta
Deal found 4/20![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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 5/2210:30 am
ONT
- BOI
1 stop6h 50m
Southwest
Mon 5/256:30 am
BOI
- ONT
1 stop4h 55m
Southwest
Deal found 4/17![Southwest logo]()
$338
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:00 am
ONT
- GEG
1 stop7h 04m
Alaska Airlines
Mon 5/186:00 am
GEG
- ONT
1 stop5h 10m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Fri 5/225:00 am
ONT
- SUN
1 stop7h 47m
United Airlines
Sun 5/318:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 4/16![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 7/153:40 pm
ONT
- BOI
2 stops6h 40m
Southwest
Wed 7/225:30 am
BOI
- ONT
2 stops7h 00m
Southwest
Deal found 4/20![Southwest logo]()
$347
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 4/18![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/156:00 am
ONT
- GEG
1 stop5h 42m
Alaska Airlines
Tue 5/1912:46 pm
GEG
- ONT
1 stop6h 01m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$336
This United Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:00 am
ONT
- WYS
1 stop7h 28m
United Airlines
Wed 5/272:19 pm
WYS
- ONT
1 stop7h 23m
United Airlines
Deal found 4/20![United Airlines logo]()
$394
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/56:00 am
ONT
- SUN
1 stop5h 01m
Delta
Sat 5/912:39 pm
SUN
- ONT
1 stop4h 38m
Delta
Deal found 4/20![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/303:35 pm
ONT
- BOI
2 stops6h 40m
Southwest
Mon 6/111:15 am
BOI
- ONT
2 stops6h 10m
Southwest
Deal found 4/17![Southwest logo]()
$378
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 6/34:03 pm
ONT
- GEG
1 stop5h 15m
Alaska Airlines
Sat 6/63:38 pm
GEG
- ONT
2 stops19h 32m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$345
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 7/151:50 pm
ONT
- JAC
1 stop6h 55m
United Airlines
Wed 7/228:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 4/16![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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 8/82:05 pm
ONT
- GEG
1 stop4h 55m
Alaska Airlines
Wed 8/126:13 am
GEG
- ONT
1 stop5h 01m
Alaska Airlines
Deal found 4/17![Alaska Airlines logo]()
$361
This Delta deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” 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 7/105:16 pm
ONT
- GEG
1 stop6h 39m
Delta
Mon 7/136:20 am
GEG
- ONT
1 stop4h 59m
Delta
Deal found 4/19![Delta logo]()
$361
This United Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/265:00 am
ONT
- JAC
1 stop6h 46m
United Airlines
Thu 6/41:42 pm
JAC
- ONT
1 stop4h 46m
United Airlines
Deal found 4/18![United Airlines logo]()
$409
This Delta deal was found by Cheapflights users on 4/16. 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.
Fri 7/245:16 pm
ONT
- GEG
1 stop6h 39m
Delta
Mon 7/276:20 am
GEG
- ONT
1 stop4h 59m
Delta
Deal found 4/16![Delta logo]()
$361
This Alaska Airlines deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/264:03 pm
ONT
- GEG
1 stop5h 15m
Alaska Airlines
Wed 5/271:59 pm
GEG
- ONT
1 stop4h 48m
Alaska Airlines
Deal found 4/18![Alaska Airlines logo]()
$367
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Thu 6/111:50 pm
ONT
- SUN
1 stop7h 01m
United Airlines
Sun 6/148:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 4/16![United Airlines logo]()
$434
This Delta deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” 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 6/89:40 am
ONT
- JAC
1 stop6h 19m
Delta
Mon 6/156:06 pm
JAC
- ONT
1 stop6h 39m
Delta
Deal found 4/21![Delta logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 8/194:50 pm
ONT
- GEG
1 stop3h 56m
Alaska Airlines
Sun 8/2310:36 am
GEG
- ONT
1 stop5h 34m
Alaska Airlines
Deal found 4/16![Alaska Airlines logo]()
$377
This Delta deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:00 am
ONT
- JAC
2 stops8h 13m
Delta
Wed 5/61:09 pm
JAC
- ONT
2 stops10h 28m
Delta
Deal found 4/18![Delta logo]()
$374
This Alaska Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 5/207:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Fri 5/224:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/16![Alaska Airlines logo]()
$377
This United Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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.
Sun 6/145:00 am
ONT
- IDA
1 stop7h 25m
United Airlines
Fri 6/194:10 pm
IDA
- ONT
1 stop5h 32m
United Airlines
Deal found 4/17![United Airlines logo]()
$473
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated April 21, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated April 21, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/122:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 5/164:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$177
This Expedia deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/122:59 pm
ONT
- BOI
Nonstop2h 00m
Multiple Airlines
Sun 5/171:22 pm
BOI
- ONT
1 stop21h 43m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$194
This CheapOair deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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 5/226:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 5/2712:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 4/17![Frontier logo]()
$196
This Frontier deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” 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 5/246:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Thu 5/281:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 4/21![Frontier logo]()
$181
This Alaska Airlines deal was found by Cheapflights users on 4/21. Clicking the “Pick Dates” 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.
Sun 5/247:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 5/304:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/21![Alaska Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/267:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Wed 6/34:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/261:35 pm
ONT
- BOI
1 stop5h 59m
Delta
Wed 6/312:55 pm
BOI
- ONT
1 stop4h 22m
Delta
Deal found 4/20![Delta logo]()
$167
This CheapOair deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Fri 5/2912:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 4/19![Frontier logo]()
$191
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/281:35 pm
ONT
- BOI
1 stop5h 59m
Delta
Sat 5/305:45 am
BOI
- ONT
1 stop6h 27m
Delta
Deal found 4/20![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 4/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/302:50 pm
ONT
- BOI
1 stop6h 15m
Southwest
Tue 6/26:40 am
BOI
- ONT
2 stops5h 55m
Southwest
Deal found 4/19![Southwest logo]()
$172
This Frontier deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/316:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Sun 6/71:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 4/20![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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.
Sun 5/313:30 pm
ONT
- TWF
1 stop19h 30m
Multiple Airlines
Fri 6/51:45 pm
TWF
- ONT
1 stop6h 47m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$188
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 April 21, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated April 21, 2026.
This Priceline deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 4/18![Frontier logo]()
$70
This Southwest deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:20 pm
ONT
- BOI
1 stop3h 55m
Southwest
Deal found 4/17![Southwest logo]()
$84
This Frontier deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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 5/316:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 4/17![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/256:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Deal found 4/20![Frontier logo]()
$95
This Expedia deal was found by Cheapflights users on 4/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/210:50 am
ONT
- GEG
1 stop24h 48m
Frontier
Deal found 4/16![Frontier logo]()
$96
This Alaska Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” 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
Deal found 4/17![Alaska Airlines logo]()
$99
This Trip.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2912:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Deal found 4/17![Frontier logo]()
$101
This Delta deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/124:57 pm
ONT
- BOI
1 stop6h 07m
Delta
Deal found 4/20![Delta logo]()
$104
This Expedia deal was found by Cheapflights users on 4/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:00 am
ONT
- GEG
1 stop5h 33m
Frontier
Deal found 4/16![Frontier logo]()
$109
This Trip.com deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:44 am
ONT
- IDA
1 stop5h 43m
Multiple Airlines
Deal found 4/20![Multiple Airlines logo]()
$110
This Frontier deal was found by Cheapflights users on 4/20. Clicking the “Pick Dates” 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 5/146:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 4/20![Frontier logo]()
$111
This Southwest deal was found by Cheapflights users on 4/18. Clicking the “Pick Dates” 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 5/298:00 am
ONT
- BOI
1 stop8h 00m
Southwest
Deal found 4/18![Southwest logo]()
$114
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 April 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $157 (Alaska Airlines) |
One-way from | $70 (Priceline) |
Popular in | February |
Cheapest in | April |
Average price | $236 |
Good round-trip deal | $167 or less |
Good one-way deal | $180 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 April 21, 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
Sat 5/30
1:35 pm-8:34 pm
1 stop5h 59m
Boise Air Term. Gowen Fld
Mon 6/1
6:00 pm-10:32 pm
1 stop5h 32m
$197
OntarioHailey
ONT - SUN
ONTSUN
Ontario
Mon 5/25
6:00 am-11:57 am
1 stop4h 57m
Hailey Sun Valley-Friedman
Wed 6/3
7:30 am-12:19 pm
1 stop5h 49m
$289
Quickest round-trip
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 5/19
7:48 pm-10:47 pm
Nonstop1h 59m
Boise Air Term. Gowen Fld
Tue 5/26
4:14 pm-5:17 pm
Nonstop2h 03m
$297
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 7/15
6:01 pm-11:53 pm
1 stop4h 52m
Boise Air Term. Gowen Fld
Wed 7/22
6:42 pm-11:44 pm
1 stop6h 02m
$297
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Mon 6/8
7:48 pm-10:47 pm
Nonstop1h 59m
Boise Air Term. Gowen Fld
Tue 7/28
2:31 pm-3:38 pm
Nonstop2h 07m
$307
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Tue 5/12
4:30 pm-10:45 pm
2 stops6h 15m
Spokane
Sat 5/16
6:45 am-2:10 pm
1 stop7h 25m
$319
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Sat 5/16
6:00 am-1:04 pm
1 stop7h 04m
Spokane
Mon 5/18
6:00 am-11:10 am
1 stop5h 10m
$329
OntarioJackson
ONT - JAC
ONTJAC
Ontario
Sun 5/24
6:00 am-10:48 am
1 stop3h 48m
Jackson Hole
Sat 5/30
5:59 pm-10:45 pm
1 stop5h 46m
$329
OntarioHailey
ONT - SUN
ONTSUN
Ontario
Tue 5/5
6:00 am-12:01 pm
1 stop5h 01m
Hailey Sun Valley-Friedman
Sat 5/9
12:39 pm-4:17 pm
1 stop4h 38m
$329
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Fri 5/15
6:00 am-11:42 am
1 stop5h 42m
Spokane
Tue 5/19
12:46 pm-6:47 pm
1 stop6h 01m
$336
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-TWF
ONT-GEG
ONT-IDA
ONT-SUN
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-TWF
ONT-GEG
ONT-IDA
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 April 21, 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 64% 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 April 21, 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.
Entertainment
7.5
Overall
8.0
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Overall
8.0
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Overall
8.0
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Overall
8.0
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Overall
8.0
Comfort
8.0
Boarding
8.1
Food
7.0
Crew
8.6
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 April 21, 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 April 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$244 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$153 | Average$391 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$176 | Average$355 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$319 | FlexibilityNo cancel fee | On-time69% |