$96+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Jun 27 — Jul 41
Round-trip
1 adult, Economy
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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 28, 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 28, 2026.
This CheapOair deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/64:42 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Tue 10/132:51 pm
BOI
- ONT
Nonstop2h 11m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:12 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 11/144:48 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/224:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Mon 8/313:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2412:55 pm
ONT
- BOI
1 stop3h 52m
Delta
Wed 8/266:39 pm
BOI
- ONT
1 stop5h 55m
Delta
Deal found 5/26![Delta logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/234:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Mon 8/313:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/224:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Thu 8/276:23 am
BOI
- ONT
1 stop5h 41m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$227
This Frontier deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/176:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 6/2412:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/24![Frontier logo]()
$230
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Fri 7/312:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/25![Frontier logo]()
$236
This Alaska Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/284:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Mon 8/315:52 pm
BOI
- ONT
1 stop6h 32m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$237
This Kiwi.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/229:12 pm
ONT
- IDA
1 stop15h 22m
Multiple Airlines
Mon 11/97:47 pm
IDA
- ONT
1 stop17h 15m
Multiple Airlines
Deal found 5/26![Multiple Airlines logo]()
$238
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/226:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Mon 6/2912:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/25![Frontier logo]()
$242
This Southwest deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/255:45 am
ONT
- BOI
2 stops6h 55m
Southwest
Tue 9/17:05 am
BOI
- ONT
1 stop4h 20m
Southwest
Deal found 5/25![Southwest logo]()
$242
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 28, 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 28, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/284:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Mon 8/313:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$207
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2312:55 pm
ONT
- BOI
1 stop3h 52m
Delta
Sun 8/306:39 pm
BOI
- ONT
1 stop5h 55m
Delta
Deal found 5/26![Delta logo]()
$217
This Southwest deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/77:20 pm
ONT
- BOI
1 stop4h 15m
Southwest
Tue 7/146:00 am
BOI
- ONT
2 stops7h 25m
Southwest
Deal found 5/27![Southwest logo]()
$326
This United Airlines deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/91:50 pm
ONT
- SUN
1 stop7h 01m
United Airlines
Sat 6/138:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 5/25![United Airlines logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/224:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Tue 8/253:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/114:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Sun 9/133:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$227
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:43 am
ONT
- SUN
1 stop4h 00m
Delta
Tue 8/251:06 pm
SUN
- ONT
1 stop4h 18m
Delta
Deal found 5/26![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” 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 6/268:45 pm
ONT
- BOI
1 stop4h 00m
Southwest
Sat 6/276:00 pm
BOI
- ONT
1 stop5h 00m
Southwest
Deal found 5/28![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:10 pm
ONT
- BOI
1 stop3h 54m
Delta
Sat 7/185:15 pm
BOI
- ONT
1 stop6h 08m
Delta
Deal found 5/24![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:14 pm
ONT
- BOI
1 stop7h 30m
Alaska Airlines
Mon 9/213:02 pm
BOI
- ONT
Nonstop2h 08m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$292
This United Airlines deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/191:18 pm
ONT
- SUN
1 stop7h 08m
United Airlines
Sun 6/218:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 5/25![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/268:45 pm
ONT
- BOI
1 stop4h 00m
Southwest
Mon 6/297:40 pm
BOI
- ONT
1 stop4h 50m
Southwest
Deal found 5/27![Southwest logo]()
$337
This Delta deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:10 pm
ONT
- BOI
1 stop5h 55m
Delta
Sun 8/96:00 am
BOI
- ONT
1 stop3h 48m
Delta
Deal found 5/23![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:05 pm
ONT
- SUN
1 stop4h 03m
Delta
Sat 8/297:40 am
SUN
- ONT
1 stop5h 25m
Delta
Deal found 5/26![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:00 am
ONT
- IDA
1 stop8h 35m
Alaska Airlines
Tue 10/276:09 am
IDA
- ONT
1 stop8h 10m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$319
This United Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/265:00 am
ONT
- IDA
1 stop7h 25m
United Airlines
Fri 7/34:14 pm
IDA
- ONT
1 stop5h 28m
United Airlines
Deal found 5/27![United Airlines logo]()
$402
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:43 am
ONT
- SUN
1 stop4h 00m
Delta
Fri 8/287:40 am
SUN
- ONT
1 stop5h 25m
Delta
Deal found 5/26![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/188:45 pm
ONT
- GEG
1 stop4h 35m
Southwest
Tue 6/235:35 am
GEG
- ONT
1 stop4h 00m
Southwest
Deal found 5/25![Southwest logo]()
$376
This Alaska Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:02 am
ONT
- BOI
1 stop5h 45m
Alaska Airlines
Sun 8/92:31 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/245:05 pm
ONT
- SUN
1 stop4h 03m
Delta
Fri 8/287:40 am
SUN
- ONT
1 stop5h 25m
Delta
Deal found 5/26![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/114:55 pm
ONT
- GEG
2 stops7h 15m
Southwest
Wed 7/155:00 am
GEG
- ONT
2 stops7h 25m
Southwest
Deal found 5/24![Southwest logo]()
$391
This Alaska Airlines deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/205:26 pm
ONT
- BOI
1 stop5h 38m
Alaska Airlines
Sat 7/252:31 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$327
This United Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/135:00 am
ONT
- WYS
1 stop7h 32m
United Airlines
Fri 6/192:19 pm
WYS
- ONT
1 stop7h 27m
United Airlines
Deal found 5/23![United Airlines logo]()
$449
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:00 am
ONT
- IDA
1 stop5h 27m
Delta
Thu 11/56:45 pm
IDA
- ONT
1 stop6h 03m
Delta
Deal found 5/26![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/83:30 pm
ONT
- GEG
2 stops8h 20m
Southwest
Mon 7/135:10 pm
GEG
- ONT
1 stop6h 25m
Southwest
Deal found 5/27![Southwest logo]()
$394
This Delta deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:05 pm
ONT
- IDA
1 stop4h 14m
Delta
Fri 11/66:45 pm
IDA
- ONT
1 stop6h 03m
Delta
Deal found 5/26![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/111:50 pm
ONT
- JAC
1 stop6h 40m
United Airlines
Sun 6/148:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 5/23![United Airlines logo]()
$474
This Southwest deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/144:10 pm
ONT
- GEG
2 stops8h 00m
Southwest
Sun 7/195:00 am
GEG
- ONT
1 stop4h 05m
Southwest
Deal found 5/27![Southwest logo]()
$394
This Alaska Airlines deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:04 pm
ONT
- GEG
1 stop6h 56m
Alaska Airlines
Wed 8/198:31 am
GEG
- ONT
1 stop5h 38m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$359
This CheapOair deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/175:32 pm
ONT
- GEG
1 stop5h 27m
Alaska Airlines
Sat 8/2210:36 am
GEG
- ONT
1 stop5h 34m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$359
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated May 28, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated May 28, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair 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
Wed 6/1712:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/26![Frontier logo]()
$280
This CheapOair deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/156:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 6/1712:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/25![Frontier logo]()
$246
This CheapOair deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1610:50 am
ONT
- GEG
1 stop24h 46m
Frontier
Fri 6/1912:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/25![Frontier logo]()
$252
This Booking.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com 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
Thu 6/181:25 pm
BOI
- ONT
1 stop21h 40m
Frontier
Deal found 5/26![Frontier logo]()
$275
This Frontier deal was found by Cheapflights users on 5/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/176:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 6/2412:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/24![Frontier logo]()
$230
This United Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/201:40 pm
ONT
- BOI
1 stop7h 00m
United Airlines
Tue 6/237:05 pm
BOI
- ONT
1 stop4h 32m
United Airlines
Deal found 5/27![United Airlines logo]()
$257
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/226:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Mon 6/2912:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/25![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/226:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 7/112:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/25![Frontier logo]()
$272
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/301:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/26![Frontier logo]()
$258
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Fri 7/312:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/25![Frontier logo]()
$236
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
ONT
- GEG
1 stop5h 36m
Frontier
Wed 7/112:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/25![Frontier logo]()
$266
This Frontier deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/256:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Thu 7/21:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/26![Frontier logo]()
$268
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 28, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated May 28, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:27 pm
ONT
- GEG
1 stop19h 55m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$96
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 am
ONT
- GEG
1 stop5h 33m
Frontier
Deal found 5/27![Frontier logo]()
$115
This Alaska Airlines deal was found by Cheapflights users on 5/28. Clicking the “Pick Dates” 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 8/224:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$119
This Frontier deal was found by Cheapflights users on 5/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 5/25![Frontier logo]()
$121
This CheapOair deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1810:50 am
ONT
- GEG
1 stop24h 43m
Frontier
Deal found 5/27![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:00 am
ONT
- BOI
1 stop5h 09m
Frontier
Deal found 5/27![Frontier logo]()
$129
This Mytrip deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/310:50 am
ONT
- GEG
1 stop24h 43m
Frontier
Deal found 5/26![Frontier logo]()
$131
This CheapOair deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/110:50 am
ONT
- GEG
1 stop24h 43m
Frontier
Deal found 5/26![Frontier logo]()
$132
This Frontier deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:00 am
ONT
- BOI
1 stop5h 29m
Frontier
Deal found 5/27![Frontier logo]()
$134
This Alaska Airlines deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/194:50 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$139
This CheapOair deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2710:50 am
ONT
- GEG
1 stop24h 43m
Frontier
Deal found 5/27![Frontier logo]()
$140
This Booking.com deal was found by Cheapflights users on 5/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/410:50 am
ONT
- BOI
1 stop24h 39m
Frontier
Deal found 5/27![Frontier logo]()
$140
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 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $177 (CheapOair) |
One-way from | $96 (Kiwi.com) |
Popular in | February |
Cheapest in | April |
Average price | $297 |
Good round-trip deal | $347 or less |
Good one-way deal | $198 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 28, 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
Quickest round-trip
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 8/28
4:50 pm-7:45 pm
Nonstop1h 55m
Boise Air Term. Gowen Fld
Mon 8/31
3:02 pm-4:10 pm
Nonstop2h 08m
$207
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Sun 8/23
12:55 pm-5:47 pm
1 stop3h 52m
Boise Air Term. Gowen Fld
Sun 8/30
6:39 pm-11:34 pm
1 stop5h 55m
$217
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Sat 8/22
4:50 pm-7:45 pm
Nonstop1h 55m
Boise Air Term. Gowen Fld
Tue 8/25
3:02 pm-4:10 pm
Nonstop2h 08m
$217
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 9/11
4:50 pm-7:45 pm
Nonstop1h 55m
Boise Air Term. Gowen Fld
Sun 9/13
3:02 pm-4:10 pm
Nonstop2h 08m
$227
OntarioHailey
ONT - SUN
ONTSUN
Ontario
Sun 8/23
9:43 am-2:43 pm
1 stop4h 00m
Hailey Sun Valley-Friedman
Tue 8/25
1:06 pm-4:24 pm
1 stop4h 18m
$289
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Thu 9/17
3:14 pm-11:44 pm
1 stop7h 30m
Boise Air Term. Gowen Fld
Mon 9/21
3:02 pm-4:10 pm
Nonstop2h 08m
$292
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 7/14
5:10 pm-10:04 pm
1 stop3h 54m
Boise Air Term. Gowen Fld
Sat 7/18
5:15 pm-10:23 pm
1 stop6h 08m
$307
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 7/29
5:10 pm-12:05 am
1 stop5h 55m
Boise Air Term. Gowen Fld
Sun 8/9
6:00 am-8:48 am
1 stop3h 48m
$307
OntarioHailey
ONT - SUN
ONTSUN
Ontario
Wed 8/26
5:05 pm-10:08 pm
1 stop4h 03m
Hailey Sun Valley-Friedman
Sat 8/29
7:40 am-12:05 pm
1 stop5h 25m
$309
OntarioHailey
ONT - SUN
ONTSUN
Ontario
Sun 8/23
9:43 am-2:43 pm
1 stop4h 00m
Hailey Sun Valley-Friedman
Fri 8/28
7:40 am-12:05 pm
1 stop5h 25m
$309
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-SUN
ONT-IDA
ONT-GEG
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-SUN
ONT-IDA
ONT-GEG
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 28, 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 28, 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?
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 73 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.
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 28, 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.
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Boarding
8.1
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 28, 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 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$117 | Average$259 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$158 | Average$325 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$176 | Average$362 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$319 | FlexibilityNo cancel fee | On-time69% |