$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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Apr 28 — May 51
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 29, 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 29, 2026.
This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1812:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Sun 4/2611:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/28![Frontier logo]()
$140
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Tue 5/191:22 pm
BOI
- ONT
1 stop11h 27m
Frontier
Deal found 3/26![Frontier logo]()
$140
This CheapOair deal was found by Cheapflights users on 3/28. 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 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 3/28![Frontier logo]()
$151
This CheapOair deal was found by Cheapflights users on 3/25. 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.
Wed 4/1512:59 am
ONT
- BOI
1 stop9h 09m
Frontier
Sun 4/1911:53 am
BOI
- ONT
1 stop20h 38m
Frontier
Deal found 3/25![Frontier logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Sat 4/186:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Sat 4/251:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 3/27![Alaska Airlines logo]()
$157
This Expedia deal was found by Cheapflights users on 3/24. 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 Expedia 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
Thu 4/3011:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/24![Frontier logo]()
$160
This Expedia deal was found by Cheapflights users on 3/27. 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 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 3/27![Frontier logo]()
$161
This Southwest deal was found by Cheapflights users on 3/27. 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.
Sat 4/185:30 am
ONT
- BOI
1 stop6h 50m
Southwest
Sat 4/252:50 pm
BOI
- ONT
1 stop7h 30m
Southwest
Deal found 3/27![Southwest logo]()
$177
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1210:50 am
ONT
- GEG
1 stop24h 48m
Frontier
Fri 5/1512:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 3/26![Frontier logo]()
$181
This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia 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
Sun 5/241:25 pm
BOI
- ONT
1 stop21h 40m
Frontier
Deal found 3/28![Frontier logo]()
$185
This Southwest deal was found by Cheapflights users on 3/24. 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 5/29:30 am
ONT
- BOI
1 stop5h 45m
Southwest
Sat 5/92:50 pm
BOI
- ONT
1 stop7h 30m
Southwest
Deal found 3/24![Southwest logo]()
$187
This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
- BOI
1 stop5h 27m
Multiple Airlines
Sat 5/91:15 pm
BOI
- ONT
Nonstop2h 04m
Multiple Airlines
Deal found 3/28![Multiple Airlines logo]()
$189
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 29, 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 29, 2026.
This Southwest deal was found by Cheapflights users on 3/27. 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.
Sat 4/185:30 am
ONT
- BOI
1 stop6h 50m
Southwest
Sat 4/252:50 pm
BOI
- ONT
1 stop7h 30m
Southwest
Deal found 3/27![Southwest logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Tue 4/286:00 am
ONT
- GEG
1 stop4h 38m
Alaska Airlines
Sat 5/25:00 am
GEG
- ONT
1 stop4h 45m
Alaska Airlines
Deal found 3/27![Alaska Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 3/24. 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.
Fri 5/15:05 pm
ONT
- GEG
1 stop6h 29m
Delta
Tue 5/55:30 am
GEG
- ONT
1 stop6h 44m
Delta
Deal found 3/24![Delta logo]()
$283
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:00 am
ONT
- BOI
1 stop4h 06m
United Airlines
Thu 5/76:23 am
BOI
- ONT
1 stop6h 59m
United Airlines
Deal found 3/24![United Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 3/26. 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 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
Sat 4/183:25 pm
BOI
- ONT
2 stops6h 20m
Southwest
Deal found 3/26![Southwest logo]()
$239
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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 4/286:00 am
ONT
- BOI
1 stop6h 52m
Alaska Airlines
Wed 4/296:08 pm
BOI
- ONT
1 stop5h 24m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 3/24. 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.
Fri 6/54:40 pm
ONT
- BOI
2 stops6h 35m
Southwest
Mon 6/86:00 am
BOI
- ONT
2 stops6h 20m
Southwest
Deal found 3/24![Southwest logo]()
$263
This Delta deal was found by Cheapflights users on 3/26. 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 8/25:16 pm
ONT
- BOI
1 stop5h 49m
Delta
Sat 8/1511:35 am
BOI
- ONT
1 stop5h 39m
Delta
Deal found 3/26![Delta logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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.
Tue 4/286:00 am
ONT
- GEG
1 stop4h 38m
Alaska Airlines
Wed 4/295:00 am
GEG
- ONT
1 stop4h 45m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$312
This Delta deal was found by Cheapflights users on 3/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:00 am
ONT
- WYS
1 stop5h 21m
Delta
Sun 9/201:09 pm
WYS
- ONT
1 stop4h 05m
Delta
Deal found 3/27![Delta logo]()
$314
This Southwest deal was found by Cheapflights users on 3/26. 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 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
Fri 5/155:35 pm
GEG
- ONT
1 stop5h 30m
Southwest
Deal found 3/26![Southwest logo]()
$289
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:10 am
ONT
- SUN
1 stop7h 25m
United Airlines
Sat 5/22:30 pm
SUN
- ONT
1 stop7h 06m
United Airlines
Deal found 3/24![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 3/24. 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 5/25:30 am
ONT
- BOI
2 stops7h 40m
Southwest
Sat 5/98:50 am
BOI
- ONT
1 stop4h 25m
Southwest
Deal found 3/24![Southwest logo]()
$292
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
Thu 4/307:00 am
ONT
- GEG
1 stop4h 46m
Alaska Airlines
Mon 5/47:40 pm
GEG
- ONT
1 stop4h 08m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$322
This Delta deal was found by Cheapflights users on 3/24. 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.
Sun 6/286:00 am
ONT
- SUN
1 stop5h 21m
Delta
Fri 7/31:10 pm
SUN
- ONT
1 stop4h 32m
Delta
Deal found 3/24![Delta logo]()
$335
This United Airlines deal was found by Cheapflights users on 3/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:00 am
ONT
- GEG
1 stop4h 27m
United Airlines
Thu 6/41:41 pm
GEG
- ONT
1 stop7h 01m
United Airlines
Deal found 3/26![United Airlines logo]()
$386
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
Thu 8/64:04 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Sun 8/92:17 pm
BOI
- ONT
Nonstop2h 07m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” 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 5/95:55 pm
ONT
- IDA
1 stop3h 47m
Delta
Thu 5/146:54 pm
IDA
- ONT
1 stop5h 40m
Delta
Deal found 3/29![Delta logo]()
$353
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/155:00 am
ONT
- IDA
1 stop7h 25m
United Airlines
Wed 7/224:10 pm
IDA
- ONT
1 stop5h 32m
United Airlines
Deal found 3/24![United Airlines logo]()
$406
This Delta deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” 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
- IDA
1 stop3h 47m
Delta
Thu 5/146:54 pm
IDA
- ONT
1 stop5h 40m
Delta
Deal found 3/29![Delta logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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 6/139:13 pm
ONT
- GEG
1 stop11h 13m
Alaska Airlines
Mon 6/225:00 am
GEG
- ONT
1 stop4h 59m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$361
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/145:00 am
ONT
- IDA
1 stop7h 24m
United Airlines
Fri 9/252:35 pm
IDA
- ONT
1 stop6h 45m
United Airlines
Deal found 3/24![United Airlines logo]()
$409
This Delta deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” 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 5/129:50 am
ONT
- IDA
1 stop3h 44m
Delta
Thu 5/146:54 pm
IDA
- ONT
1 stop5h 40m
Delta
Deal found 3/29![Delta logo]()
$353
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/245:10 am
ONT
- JAC
1 stop7h 11m
United Airlines
Mon 4/277:00 am
JAC
- ONT
1 stop6h 38m
United Airlines
Deal found 3/24![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
Tue 6/234:04 pm
ONT
- GEG
1 stop5h 29m
Alaska Airlines
Fri 7/175:00 am
GEG
- ONT
1 stop4h 59m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$380
This Delta deal was found by Cheapflights users on 3/24. 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.
Mon 6/221:48 pm
ONT
- GEG
1 stop7h 21m
Delta
Fri 7/1711:19 am
GEG
- ONT
1 stop6h 02m
Delta
Deal found 3/24![Delta logo]()
$361
This United Airlines deal was found by Cheapflights users on 3/27. 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 5/95:00 am
ONT
- SUN
1 stop7h 38m
United Airlines
Wed 5/132:30 pm
SUN
- ONT
1 stop7h 06m
United Airlines
Deal found 3/27![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 3/28. 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.
Fri 9/254:00 pm
ONT
- IDA
1 stop5h 39m
Alaska Airlines
Mon 9/286:15 am
IDA
- ONT
1 stop5h 54m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$409
This United Airlines deal was found by Cheapflights users on 3/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/105:00 am
ONT
- SUN
1 stop7h 47m
United Airlines
Mon 6/158:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 3/24![United Airlines logo]()
$415
This Delta deal was found by Cheapflights users on 3/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:00 am
ONT
- TWF
1 stop3h 46m
Delta
Mon 6/156:15 am
TWF
- ONT
1 stop3h 32m
Delta
Deal found 3/28![Delta logo]()
$406
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated March 29, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated March 29, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/25. 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.
Wed 4/1512:59 am
ONT
- BOI
1 stop9h 09m
Frontier
Sun 4/1911:53 am
BOI
- ONT
1 stop20h 38m
Frontier
Deal found 3/25![Frontier logo]()
$151
This Expedia deal was found by Cheapflights users on 3/27. 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 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 3/27![Frontier logo]()
$161
This Orbitz deal was found by Cheapflights users on 3/25. 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 Orbitz 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
Multiple Airlines
Sun 4/1911:53 am
BOI
- ONT
1 stop20h 38m
Multiple Airlines
Deal found 3/25![Multiple Airlines logo]()
$204
This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1812:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Sun 4/2611:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/28![Frontier logo]()
$140
This Southwest deal was found by Cheapflights users on 3/27. 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.
Sat 4/185:30 am
ONT
- BOI
1 stop6h 50m
Southwest
Sat 4/252:50 pm
BOI
- ONT
1 stop7h 30m
Southwest
Deal found 3/27![Southwest logo]()
$177
This Frontier deal was found by Cheapflights users on 3/27. 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.
Sat 4/1812:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Thu 4/2311:44 am
GEG
- ONT
1 stop12h 11m
Frontier
Deal found 3/27![Frontier logo]()
$181
This Alaska Airlines deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” 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
- BOI
Nonstop2h 01m
Alaska Airlines
Fri 5/11:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 3/29![Alaska Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/213:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Tue 4/285:00 pm
BOI
- ONT
1 stop4h 50m
Southwest
Deal found 3/24![Southwest logo]()
$192
This CheapOair deal was found by Cheapflights users on 3/28. 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 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 3/28![Frontier logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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 4/222:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 4/251:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 3/27![Alaska Airlines logo]()
$157
This Expedia deal was found by Cheapflights users on 3/24. 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 Expedia 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
Thu 4/3011:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/24![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 3/28. 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 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 3/28![Multiple Airlines logo]()
$197
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 29, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated March 29, 2026.
This Priceline deal was found by Cheapflights users on 3/25. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 3/25![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 3/28. 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 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 3/28![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Deal found 3/28![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/27. 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 5/76:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 3/27![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 3/29. Clicking the “Pick Dates” 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.
Sat 4/116:20 am
ONT
- BOI
1 stop27h 48m
Frontier
Deal found 3/29![Frontier logo]()
$95
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Tue 4/216:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Deal found 3/27![Alaska Airlines logo]()
$99
This CheapOair deal was found by Cheapflights users on 3/25. 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.
Wed 4/86:20 am
ONT
- BOI
1 stop27h 48m
Frontier
Deal found 3/25![Frontier logo]()
$102
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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.
Wed 4/156:25 pm
ONT
- BOI
Nonstop2h 01m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$109
This Frontier deal was found by Cheapflights users on 3/27. 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 5/146:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 3/27![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 5/711:36 am
ONT
- GEG
1 stop8h 53m
Multiple Airlines
Deal found 3/26![Multiple Airlines logo]()
$112
This Frontier deal was found by Cheapflights users on 3/26. 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 6/26:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 3/26![Frontier logo]()
$112
This Southwest deal was found by Cheapflights users on 3/27. 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 4/245:05 pm
ONT
- BOI
1 stop6h 40m
Southwest
Deal found 3/27![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 March 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $140 (Expedia) |
One-way from | $70 (Priceline) |
Popular in | February |
Cheapest in | April |
Average price | $367 |
Good round-trip deal | $257 or less |
Good one-way deal | $308 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 29, 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 4/18
5:30 am-1:20 pm
1 stop6h 50m
Boise Air Term. Gowen Fld
Sat 4/25
2:50 pm-9:20 pm
1 stop7h 30m
$177
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 4/14
3:45 pm-12:25 am
2 stops7h 40m
Boise Air Term. Gowen Fld
Sat 4/18
3:25 pm-8:45 pm
2 stops6h 20m
$239
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 6/5
4:40 pm-12:15 am
2 stops6h 35m
Boise Air Term. Gowen Fld
Mon 6/8
6:00 am-11:20 am
2 stops6h 20m
$263
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Tue 4/28
6:00 am-10:38 am
1 stop4h 38m
Spokane
Sat 5/2
5:00 am-9:45 am
1 stop4h 45m
$271
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Fri 5/1
5:05 pm-11:34 pm
1 stop6h 29m
Spokane
Tue 5/5
5:30 am-12:14 pm
1 stop6h 44m
$283
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 4/28
6:00 am-1:52 pm
1 stop6h 52m
Boise Air Term. Gowen Fld
Wed 4/29
6:08 pm-10:32 pm
1 stop5h 24m
$287
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Tue 5/12
4:30 pm-10:45 pm
2 stops6h 15m
Spokane
Fri 5/15
5:35 pm-11:05 pm
1 stop5h 30m
$289
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Sat 5/2
5:30 am-2:10 pm
2 stops7h 40m
Boise Air Term. Gowen Fld
Sat 5/9
8:50 am-12:15 pm
1 stop4h 25m
$292
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Sun 8/2
5:16 pm-12:05 am
1 stop5h 49m
Boise Air Term. Gowen Fld
Sat 8/15
11:35 am-4:14 pm
1 stop5h 39m
$297
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Mon 4/27
6:00 am-11:06 am
1 stop4h 06m
Boise Air Term. Gowen Fld
Thu 5/7
6:23 am-12:22 pm
1 stop6h 59m
$307
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-JAC
ONT-IDA
ONT-WYS
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Idaho
ONT-USID
ONT-BOI
ONT-GEG
ONT-JAC
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 29, 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.
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 29, 2026.
The most flights from ONT to USID are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).
How much does it cost to fly round-trip from Ontario to Idaho?
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated March 29, 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
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Food
7.0
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.
Browse thousands of different 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 March 29, 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 March 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$247 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$153 | Average$358 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$190 | Average$355 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$315 | FlexibilityNo cancel fee | On-time69% |