$76+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Apr 21 — Apr 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 March 22, 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 March 22, 2026.
This CheapOair deal was found by Cheapflights users on 3/19. 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 4/2212:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Sun 4/2611:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/19![Frontier logo]()
$151
This Frontier deal was found by Cheapflights users on 3/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Thu 4/2311:44 am
GEG
- ONT
1 stop12h 11m
Frontier
Deal found 3/19![Frontier logo]()
$160
This Alaska Airlines deal was found by Cheapflights users on 3/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Sat 4/184:40 pm
BOI
- ONT
Nonstop2h 05m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$177
This Expedia deal was found by Cheapflights users on 3/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Sun 4/1911:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/17![Frontier logo]()
$180
This Expedia deal was found by Cheapflights users on 3/20. 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.
Sat 5/212:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Wed 5/612:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 3/20![Frontier logo]()
$181
This United Airlines deal was found by Cheapflights users on 3/18. 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 4/1511:05 am
ONT
- BOI
1 stop4h 43m
United Airlines
Wed 4/226:15 am
BOI
- ONT
1 stop7h 05m
United Airlines
Deal found 3/18![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 3/17. 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 5/29:30 am
ONT
- BOI
1 stop5h 45m
Southwest
Tue 5/52:00 pm
BOI
- ONT
2 stops6h 40m
Southwest
Deal found 3/17![Southwest logo]()
$192
This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 4/143:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Tue 4/215:00 pm
BOI
- ONT
2 stops6h 10m
Southwest
Deal found 3/17![Southwest logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 3/19. 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.
Wed 4/227:44 pm
ONT
- GEG
1 stop24h 45m
Multiple Airlines
Sun 4/269:19 pm
GEG
- ONT
1 stop11h 05m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$201
This Alaska Airlines deal was found by Cheapflights users on 3/20. 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.
Thu 4/166:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Wed 4/221:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 3/20![Alaska Airlines logo]()
$207
This Expedia deal was found by Cheapflights users on 3/20. 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.
Sat 5/22:59 pm
ONT
- GEG
1 stop3h 48m
Multiple Airlines
Fri 5/812:33 pm
GEG
- ONT
1 stop21h 32m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$211
This Alaska Airlines deal was found by Cheapflights users on 3/17. 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 4/222:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Mon 4/274:38 pm
BOI
- ONT
1 stop18h 07m
Alaska Airlines
Deal found 3/17![Alaska Airlines logo]()
$212
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 March 22, 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 March 22, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Sat 4/184:40 pm
BOI
- ONT
Nonstop2h 05m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$177
This United Airlines deal was found by Cheapflights users on 3/17. 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.
Wed 4/81:34 pm
ONT
- BOI
1 stop6h 48m
United Airlines
Wed 4/1512:30 pm
BOI
- ONT
1 stop6h 17m
United Airlines
Deal found 3/17![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 3/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:05 am
ONT
- BOI
1 stop4h 35m
Southwest
Mon 5/117:55 pm
BOI
- ONT
1 stop4h 10m
Southwest
Deal found 3/21![Southwest logo]()
$207
This Delta deal was found by Cheapflights users on 3/19. 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.
Sat 4/255:59 pm
ONT
- GEG
1 stop4h 34m
Delta
Tue 4/286:15 am
GEG
- ONT
1 stop4h 58m
Delta
Deal found 3/19![Delta logo]()
$271
This Southwest deal was found by Cheapflights users on 3/17. 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.
Wed 5/63:45 pm
ONT
- BOI
1 stop6h 45m
Southwest
Fri 5/81:20 pm
BOI
- ONT
1 stop5h 50m
Southwest
Deal found 3/17![Southwest logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 3/17. 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.
Tue 4/216:25 pm
ONT
- GEG
1 stop3h 52m
Alaska Airlines
Sat 4/255:00 am
GEG
- ONT
1 stop4h 45m
Alaska Airlines
Deal found 3/17![Alaska Airlines logo]()
$271
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/186:00 am
ONT
- GEG
1 stop5h 43m
United Airlines
Sat 4/257:00 am
GEG
- ONT
1 stop5h 20m
United Airlines
Deal found 3/21![United Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 3/17. 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.
Thu 4/165:55 pm
ONT
- LWS
1 stop6h 13m
Delta
Sat 4/256:09 am
LWS
- ONT
1 stop5h 04m
Delta
Deal found 3/17![Delta logo]()
$294
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 am
ONT
- GEG
1 stop5h 16m
United Airlines
Sat 5/95:00 am
GEG
- ONT
1 stop7h 38m
United Airlines
Deal found 3/21![United Airlines logo]()
$271
This Southwest deal was found by Cheapflights users on 3/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:55 am
ONT
- GEG
2 stops7h 10m
Southwest
Sat 5/91:45 pm
GEG
- ONT
1 stop7h 00m
Southwest
Deal found 3/21![Southwest logo]()
$276
This Alaska Airlines deal was found by Cheapflights users on 3/20. 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 4/222:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Fri 4/247:20 pm
BOI
- ONT
1 stop5h 39m
Alaska Airlines
Deal found 3/20![Alaska Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 3/20. 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 6/29:50 am
ONT
- BOI
1 stop7h 00m
Delta
Fri 6/512:55 pm
BOI
- ONT
1 stop4h 22m
Delta
Deal found 3/20![Delta logo]()
$297
This United Airlines deal was found by Cheapflights users on 3/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:27 pm
ONT
- BOI
1 stop5h 26m
United Airlines
Sat 4/257:03 pm
BOI
- ONT
1 stop4h 42m
United Airlines
Deal found 3/19![United Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 3/17. 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 6/56:30 pm
ONT
- BOI
1 stop4h 45m
Southwest
Sun 6/78:20 pm
BOI
- ONT
1 stop3h 50m
Southwest
Deal found 3/17![Southwest logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 3/18. 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 4/216:25 pm
ONT
- GEG
1 stop3h 52m
Alaska Airlines
Fri 4/247:40 pm
GEG
- ONT
1 stop4h 08m
Alaska Airlines
Deal found 3/18![Alaska Airlines logo]()
$316
This United Airlines deal was found by Cheapflights users on 3/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/305:00 am
ONT
- SUN
1 stop7h 38m
United Airlines
Tue 5/52:30 pm
SUN
- ONT
1 stop7h 06m
United Airlines
Deal found 3/21![United Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 3/20. 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.
Sat 4/46:00 am
ONT
- SUN
1 stop4h 54m
Delta
Wed 4/812:40 pm
SUN
- ONT
1 stop4h 48m
Delta
Deal found 3/20![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 6/210:30 am
ONT
- BOI
2 stops7h 30m
Southwest
Sun 6/78:35 am
BOI
- ONT
1 stop4h 05m
Southwest
Deal found 3/17![Southwest logo]()
$302
This United Airlines deal was found by Cheapflights users on 3/17. 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.
Fri 6/51:50 pm
ONT
- SUN
1 stop7h 01m
United Airlines
Sun 6/78:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 3/17![United Airlines logo]()
$295
This Delta deal was found by Cheapflights users on 3/21. 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.
Wed 6/39:50 am
ONT
- JAC
1 stop6h 09m
Delta
Sat 6/65:59 pm
JAC
- ONT
1 stop5h 46m
Delta
Deal found 3/21![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/20. 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 4/86:15 am
ONT
- BOI
2 stops7h 25m
Southwest
Sat 4/118:50 am
BOI
- ONT
1 stop4h 25m
Southwest
Deal found 3/20![Southwest logo]()
$307
This Delta deal was found by Cheapflights users on 3/20. 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 5/136:00 am
ONT
- JAC
1 stop3h 48m
Delta
Wed 5/2011:35 am
JAC
- ONT
1 stop5h 42m
Delta
Deal found 3/20![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 3/21. 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 5/197:00 am
ONT
- IDA
1 stop5h 17m
Alaska Airlines
Sun 5/246:00 am
IDA
- ONT
1 stop6h 10m
Alaska Airlines
Deal found 3/21![Alaska Airlines logo]()
$373
This United Airlines deal was found by Cheapflights users on 3/17. 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.
Thu 4/231:34 pm
ONT
- JAC
1 stop6h 19m
United Airlines
Sun 4/267:00 am
JAC
- ONT
1 stop6h 38m
United Airlines
Deal found 3/17![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 3/17. 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.
Tue 4/145:05 pm
ONT
- IDA
1 stop4h 35m
Delta
Tue 4/216:58 pm
IDA
- ONT
1 stop5h 46m
Delta
Deal found 3/17![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 3/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/185:30 am
ONT
- GEG
2 stops8h 15m
Southwest
Sat 4/256:45 am
GEG
- ONT
2 stops8h 50m
Southwest
Deal found 3/21![Southwest logo]()
$339
This United Airlines deal was found by Cheapflights users on 3/18. 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.
Sat 4/185:10 am
ONT
- GEG
1 stop7h 30m
United Airlines
Sat 5/21:41 pm
GEG
- ONT
1 stop6h 55m
United Airlines
Deal found 3/18![United Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 3/20. 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.
Sat 4/181:29 pm
ONT
- JAC
1 stop4h 32m
Delta
Sat 4/251:00 pm
JAC
- ONT
2 stops10h 37m
Delta
Deal found 3/20![Delta logo]()
$369
This Alaska Airlines deal was found by Cheapflights users on 3/18. 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 4/283:26 pm
ONT
- IDA
1 stop6h 14m
Alaska Airlines
Fri 5/86:00 am
IDA
- ONT
2 stops18h 48m
Alaska Airlines
Deal found 3/18![Alaska Airlines logo]()
$460
This United Airlines deal was found by Cheapflights users on 3/17. 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.
Tue 4/145:10 am
ONT
- SUN
1 stop7h 25m
United Airlines
Sat 4/182:24 pm
SUN
- ONT
1 stop7h 12m
United Airlines
Deal found 3/17![United Airlines logo]()
$359
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated March 22, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated March 22, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 3/17. 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.
Wed 4/83:45 pm
ONT
- BOI
1 stop6h 35m
Southwest
Wed 4/156:40 am
BOI
- ONT
2 stops5h 55m
Southwest
Deal found 3/17![Southwest logo]()
$192
This Southwest deal was found by Cheapflights users on 3/17. 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.
Tue 4/143:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Tue 4/215:00 pm
BOI
- ONT
2 stops6h 10m
Southwest
Deal found 3/17![Southwest logo]()
$197
This Frontier deal was found by Cheapflights users on 3/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Thu 4/2311:44 am
GEG
- ONT
1 stop12h 11m
Frontier
Deal found 3/19![Frontier logo]()
$160
This Alaska Airlines deal was found by Cheapflights users on 3/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Sat 4/184:40 pm
BOI
- ONT
Nonstop2h 05m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$177
This Expedia deal was found by Cheapflights users on 3/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Sun 4/1911:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/17![Frontier logo]()
$180
This United Airlines deal was found by Cheapflights users on 3/18. 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 4/1511:05 am
ONT
- BOI
1 stop4h 43m
United Airlines
Wed 4/226:15 am
BOI
- ONT
1 stop7h 05m
United Airlines
Deal found 3/18![United Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 3/19. 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.
Wed 4/157:44 pm
ONT
- GEG
1 stop24h 45m
Multiple Airlines
Sun 4/199:19 pm
GEG
- ONT
1 stop12h 55m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$216
This Alaska Airlines deal was found by Cheapflights users on 3/20. 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.
Thu 4/166:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Wed 4/221:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 3/20![Alaska Airlines logo]()
$207
This CheapOair deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Sun 4/2611:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/22![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 3/19. 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.
Wed 4/227:44 pm
ONT
- GEG
1 stop24h 45m
Multiple Airlines
Sun 4/269:19 pm
GEG
- ONT
1 stop11h 05m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$201
This Alaska Airlines deal was found by Cheapflights users on 3/17. 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 4/222:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Mon 4/274:38 pm
BOI
- ONT
1 stop18h 07m
Alaska Airlines
Deal found 3/17![Alaska Airlines logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 4/2311:47 am
ONT
- GEG
1 stop8h 42m
Multiple Airlines
Sun 4/269:19 pm
GEG
- ONT
1 stop11h 05m
Multiple Airlines
Deal found 3/19![Multiple Airlines logo]()
$213
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 March 22, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated March 22, 2026.
This Frontier deal was found by Cheapflights users on 3/20. 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.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Deal found 3/20![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 3/20. 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 5/116:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Deal found 3/20![Frontier logo]()
$90
This Priceline deal was found by Cheapflights users on 3/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 3/17![Frontier logo]()
$90
This Trip.com deal was found by Cheapflights users on 3/19. 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 Trip.com 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
Deal found 3/19![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 3/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- BOI
1 stop9h 09m
Frontier
Deal found 3/19![Frontier logo]()
$96
This Southwest deal was found by Cheapflights users on 3/18. 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.
Wed 5/63:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Deal found 3/18![Southwest logo]()
$99
This Alaska Airlines deal was found by Cheapflights users on 3/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$109
This Expedia deal was found by Cheapflights users on 3/20. 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.
Fri 5/86:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Deal found 3/20![Frontier logo]()
$111
This Frontier deal was found by Cheapflights users on 3/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/176:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 3/19![Frontier logo]()
$111
This Delta deal was found by Cheapflights users on 3/17. 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.
Thu 4/95:09 pm
ONT
- BOI
1 stop4h 02m
Delta
Deal found 3/17![Delta logo]()
$114
This Super.com deal was found by Cheapflights users on 3/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:20 am
ONT
- BOI
1 stop27h 48m
Frontier
Deal found 3/19![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 3/17. 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.
Sat 5/212:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Deal found 3/17![Frontier logo]()
$117
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 March 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $151 (CheapOair) |
One-way from | $76 (Frontier) |
Popular in | February |
Cheapest in | April |
Average price | $367 |
Good round-trip deal | $217 or less |
Good one-way deal | $338 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 March 22, 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
Sat 4/11
6:25 pm-9:26 pm
Nonstop2h 01m
Boise Air Term. Gowen Fld
Sat 4/18
4:40 pm-5:45 pm
Nonstop2h 05m
$177
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 4/8
1:34 pm-9:22 pm
1 stop6h 48m
Boise Air Term. Gowen Fld
Wed 4/15
12:30 pm-5:47 pm
1 stop6h 17m
$187
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 5/5
9:05 am-2:40 pm
1 stop4h 35m
Boise Air Term. Gowen Fld
Mon 5/11
7:55 pm-11:05 pm
1 stop4h 10m
$207
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 5/6
3:45 pm-11:30 pm
1 stop6h 45m
Boise Air Term. Gowen Fld
Fri 5/8
1:20 pm-6:10 pm
1 stop5h 50m
$207
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Sat 4/25
5:59 pm-10:33 pm
1 stop4h 34m
Spokane
Tue 4/28
6:15 am-11:13 am
1 stop4h 58m
$271
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Tue 4/21
6:25 pm-10:17 pm
1 stop3h 52m
Spokane
Sat 4/25
5:00 am-9:45 am
1 stop4h 45m
$271
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Sat 4/18
6:00 am-11:43 am
1 stop5h 43m
Spokane
Sat 4/25
7:00 am-12:20 pm
1 stop5h 20m
$271
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Wed 5/6
6:00 am-11:16 am
1 stop5h 16m
Spokane
Sat 5/9
5:00 am-12:38 pm
1 stop7h 38m
$271
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Wed 5/6
5:55 am-1:05 pm
2 stops7h 10m
Spokane
Sat 5/9
1:45 pm-8:45 pm
1 stop7h 00m
$276
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 4/22
2:59 pm-5:59 pm
Nonstop2h 00m
Boise Air Term. Gowen Fld
Fri 4/24
7:20 pm-11:59 pm
1 stop5h 39m
$277
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-TWF
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-GEG
ONT-TWF
ONT-IDA
What is the cheapest month to book a flight from Ontario to Idaho?
Currently, November is the cheapest month in which you can book a flight from Ontario to Idaho (average of $60). Flying from Ontario to Idaho in December is currently the most expensive (average of $159). 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 March 22, 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 69% 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 March 22, 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).
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 March 22, 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.
Comfort
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Entertainment
7.5
Overall
8.0
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.
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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 March 22, 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 5 airlines flying from Ontario to Idaho
Discover the top 5 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 March 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$239 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$153 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$196 | Average$315 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$216 | Average$353 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$227 | Average$516 | FlexibilityNo cancel fee | On-time71% |