$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 5/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
May 8 — May 151
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Idaho with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Idaho
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to IdahoExplore the most affordable flight options available from Ontario to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 8, 2026.
Explore the most affordable flight options available from Ontario to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 8, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/22:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Tue 5/51:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$137
This Expedia deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Fri 5/812:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 4/7![Frontier logo]()
$140
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/22:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Thu 5/71:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Wed 5/135:00 pm
BOI
- ONT
1 stop4h 50m
Southwest
Deal found 4/7![Southwest logo]()
$162
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/292:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Wed 5/61:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$167
This CheapOair deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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 4/4![Frontier logo]()
$171
This Southwest deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 5/53:45 pm
ONT
- BOI
1 stop6h 35m
Southwest
Sat 5/91:55 pm
BOI
- ONT
2 stops7h 20m
Southwest
Deal found 4/5![Southwest logo]()
$172
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/146:00 pm
ONT
- BOI
1 stop6h 00m
Southwest
Tue 5/1911:35 am
BOI
- ONT
1 stop6h 30m
Southwest
Deal found 4/7![Southwest logo]()
$177
This Delta deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/22:20 pm
ONT
- BOI
1 stop6h 04m
Delta
Sun 5/35:40 am
BOI
- ONT
1 stop6h 33m
Delta
Deal found 4/8![Delta logo]()
$178
This Expedia deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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
Thu 4/2311:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 4/4![Frontier logo]()
$180
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/12:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 5/21:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$187
This CheapOair deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/610:50 am
ONT
- BOI
1 stop24h 37m
Frontier
Sun 5/101:22 pm
BOI
- ONT
1 stop21h 43m
Frontier
Deal found 4/7![Frontier logo]()
$192
Best flights from Ontario to IdahoDiscover carefully curated flight deals from Ontario to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 8, 2026.
Discover carefully curated flight deals from Ontario to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 8, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 5/164:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$137
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Wed 5/135:00 pm
BOI
- ONT
1 stop4h 50m
Southwest
Deal found 4/7![Southwest logo]()
$162
This Delta deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:50 pm
ONT
- BOI
1 stop5h 05m
Delta
Tue 5/1910:39 am
BOI
- ONT
1 stop7h 31m
Delta
Deal found 4/8![Delta logo]()
$177
This United Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/210:43 am
ONT
- BOI
1 stop5h 05m
United Airlines
Tue 5/512:30 pm
BOI
- ONT
1 stop6h 22m
United Airlines
Deal found 4/6![United Airlines logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 6/173:34 pm
ONT
- GEG
1 stop28h 23m
Multiple Airlines
Sun 6/218:47 pm
GEG
- ONT
1 stop23h 04m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$282
This Delta deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 4/3011:53 am
ONT
- BOI
1 stop8h 31m
Delta
Sat 5/96:00 pm
BOI
- ONT
1 stop5h 34m
Delta
Deal found 4/6![Delta logo]()
$197
This Delta deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/292:20 pm
ONT
- BOI
1 stop6h 04m
Delta
Mon 5/46:16 pm
BOI
- ONT
1 stop6h 28m
Delta
Deal found 4/7![Delta logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/13:26 pm
ONT
- BOI
1 stop7h 33m
Alaska Airlines
Sat 5/164:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/4![Alaska Airlines logo]()
$270
This Southwest deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 5/23:35 pm
ONT
- GEG
1 stop6h 40m
Southwest
Sat 5/92:25 pm
GEG
- ONT
2 stops6h 20m
Southwest
Deal found 4/5![Southwest logo]()
$276
This United Airlines deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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 4/255:10 am
ONT
- SUN
1 stop7h 25m
United Airlines
Wed 4/292:24 pm
SUN
- ONT
1 stop7h 12m
United Airlines
Deal found 4/4![United Airlines logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 4/2312:59 am
ONT
- TWF
2 stops10h 01m
Multiple Airlines
Mon 4/271:40 pm
TWF
- ONT
1 stop22h 04m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$298
This Southwest deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/231:20 pm
ONT
- BOI
1 stop7h 35m
Southwest
Thu 5/286:00 am
BOI
- ONT
2 stops7h 10m
Southwest
Deal found 4/6![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 4/5![Alaska Airlines logo]()
$301
This Delta deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/65:05 pm
ONT
- GEG
1 stop6h 29m
Delta
Tue 5/126:45 pm
GEG
- ONT
1 stop4h 49m
Delta
Deal found 4/7![Delta logo]()
$291
This United Airlines deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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 5/25:00 am
ONT
- IDA
1 stop7h 25m
United Airlines
Sat 5/92:31 pm
IDA
- ONT
1 stop7h 05m
United Airlines
Deal found 4/4![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/62:30 pm
ONT
- BOI
1 stop7h 25m
Southwest
Wed 7/82:05 pm
BOI
- ONT
2 stops7h 15m
Southwest
Deal found 4/6![Southwest logo]()
$312
This Delta deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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 4/256:00 am
ONT
- SUN
1 stop5h 01m
Delta
Wed 4/2912:42 pm
SUN
- ONT
2 stops10h 55m
Delta
Deal found 4/4![Delta logo]()
$294
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/34:03 pm
ONT
- IDA
1 stop5h 50m
Alaska Airlines
Tue 6/94:03 pm
IDA
- ONT
1 stop8h 53m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$346
This United Airlines deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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
- GEG
1 stop7h 30m
United Airlines
Sat 5/25:00 am
GEG
- ONT
2 stops12h 52m
United Airlines
Deal found 4/4![United Airlines logo]()
$356
This Delta deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/101:00 pm
ONT
- BOI
1 stop3h 52m
Delta
Fri 6/126:43 am
BOI
- ONT
1 stop5h 34m
Delta
Deal found 4/6![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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
- GEG
2 stops7h 25m
Southwest
Tue 4/285:10 am
GEG
- ONT
1 stop6h 25m
Southwest
Deal found 4/5![Southwest logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/177:00 am
ONT
- GEG
1 stop4h 45m
Alaska Airlines
Tue 6/236:13 am
GEG
- ONT
1 stop5h 01m
Alaska Airlines
Deal found 4/5![Alaska Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/101:00 pm
ONT
- BOI
1 stop3h 52m
Delta
Sat 6/133:31 pm
BOI
- ONT
1 stop8h 10m
Delta
Deal found 4/4![Delta logo]()
$297
This United Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 4/215:10 am
ONT
- SUN
1 stop7h 25m
United Airlines
Fri 4/242:24 pm
SUN
- ONT
1 stop7h 12m
United Airlines
Deal found 4/6![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 6/104:35 pm
ONT
- BOI
2 stops6h 50m
Southwest
Sat 6/133:15 pm
BOI
- ONT
2 stops7h 45m
Southwest
Deal found 4/6![Southwest logo]()
$357
This Delta deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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 8/99:40 am
ONT
- SUN
1 stop3h 54m
Delta
Tue 8/111:20 pm
SUN
- ONT
1 stop3h 54m
Delta
Deal found 4/4![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 9/13:02 pm
ONT
- IDA
1 stop6h 54m
Alaska Airlines
Sat 9/56:18 am
IDA
- ONT
1 stop5h 46m
Alaska Airlines
Deal found 4/5![Alaska Airlines logo]()
$395
This Delta deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:50 pm
ONT
- GEG
1 stop5h 01m
Delta
Tue 5/126:10 am
GEG
- ONT
1 stop5h 02m
Delta
Deal found 4/7![Delta logo]()
$336
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 7/182:05 pm
ONT
- IDA
1 stop7h 34m
Alaska Airlines
Mon 7/277:15 am
IDA
- ONT
1 stop6h 54m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$409
This United Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 8/15:00 am
ONT
- WYS
1 stop7h 32m
United Airlines
Thu 8/62:14 pm
WYS
- ONT
1 stop7h 28m
United Airlines
Deal found 4/6![United Airlines logo]()
$459
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated April 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated April 8, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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
Thu 4/2311:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 4/4![Frontier logo]()
$180
This CheapOair deal was found by Cheapflights users on 4/4. Clicking the “Pick Dates” 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 4/4![Frontier logo]()
$171
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/292:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Sat 5/91:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/12:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Wed 5/61:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/22:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Tue 5/51:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$137
This Expedia deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Fri 5/812:33 pm
GEG
- ONT
1 stop21h 32m
Frontier
Deal found 4/7![Frontier logo]()
$140
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/22:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Thu 5/71:15 pm
BOI
- ONT
Nonstop2h 04m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/22:20 pm
ONT
- BOI
1 stop6h 04m
Delta
Sun 5/35:40 am
BOI
- ONT
1 stop6h 33m
Delta
Deal found 4/8![Delta logo]()
$178
This Southwest deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 5/53:45 pm
ONT
- BOI
1 stop6h 35m
Southwest
Sat 5/91:55 pm
BOI
- ONT
2 stops7h 20m
Southwest
Deal found 4/5![Southwest logo]()
$172
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Wed 5/135:00 pm
BOI
- ONT
1 stop4h 50m
Southwest
Deal found 4/7![Southwest logo]()
$162
This CheapOair deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/610:50 am
ONT
- BOI
1 stop24h 37m
Frontier
Sun 5/101:22 pm
BOI
- ONT
1 stop21h 43m
Frontier
Deal found 4/7![Frontier logo]()
$192
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/146:00 pm
ONT
- BOI
1 stop6h 00m
Southwest
Tue 5/1911:35 am
BOI
- ONT
1 stop6h 30m
Southwest
Deal found 4/7![Southwest logo]()
$177
One-way flights from Ontario to IdahoSearch for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated April 8, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated April 8, 2026.
This Frontier deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 5/266:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 4/5![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 4/5![Frontier logo]()
$76
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/295:20 pm
ONT
- BOI
1 stop5h 00m
Southwest
Deal found 4/7![Southwest logo]()
$79
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:59 pm
ONT
- BOI
Nonstop2h 00m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$89
This Frontier deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/186:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Deal found 4/7![Frontier logo]()
$90
This Priceline deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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.
Thu 5/146:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Deal found 4/7![Frontier logo]()
$90
This Expedia deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Deal found 4/7![Frontier logo]()
$96
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/306:00 pm
ONT
- BOI
1 stop6h 00m
Southwest
Deal found 4/7![Southwest logo]()
$99
This Delta deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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 4/282:20 pm
ONT
- BOI
1 stop7h 04m
Delta
Deal found 4/5![Delta logo]()
$104
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/136:00 am
ONT
- BOI
1 stop29h 27m
Frontier
Deal found 4/7![Frontier logo]()
$112
This Southwest deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” 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.
Sun 4/265:00 am
ONT
- BOI
1 stop3h 55m
Southwest
Deal found 4/5![Southwest logo]()
$114
Find flight deals from Ontario to Idaho
Keep the following information in mind while searching for Ontario to Idaho flight deals. Data was last updated April 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $137 (Alaska Airlines) |
One-way from | $70 (Frontier) |
Popular in | February |
Cheapest in | April |
Average price | $217 |
Good round-trip deal | $257 or less |
Good one-way deal | $218 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Idaho that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 8, 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
Tue 5/12
2:59 pm-5:59 pm
Nonstop2h 00m
Boise Air Term. Gowen Fld
Sat 5/16
4:14 pm-5:17 pm
Nonstop2h 03m
$137
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 5/6
3:45 pm-12:25 am
2 stops7h 40m
Boise Air Term. Gowen Fld
Wed 5/13
5:00 pm-8:50 pm
1 stop4h 50m
$162
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Thu 5/14
5:50 pm-11:55 pm
1 stop5h 05m
Boise Air Term. Gowen Fld
Tue 5/19
10:39 am-5:10 pm
1 stop7h 31m
$177
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Thu 4/30
11:53 am-9:24 pm
1 stop8h 31m
Boise Air Term. Gowen Fld
Sat 5/9
6:00 pm-10:34 pm
1 stop5h 34m
$197
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Wed 4/29
2:20 pm-9:24 pm
1 stop6h 04m
Boise Air Term. Gowen Fld
Mon 5/4
6:16 pm-11:44 pm
1 stop6h 28m
$217
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Sat 5/2
10:43 am-4:48 pm
1 stop5h 05m
Boise Air Term. Gowen Fld
Tue 5/5
12:30 pm-5:52 pm
1 stop6h 22m
$257
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Fri 5/1
3:26 pm-11:59 pm
1 stop7h 33m
Boise Air Term. Gowen Fld
Sat 5/16
4:14 pm-5:17 pm
Nonstop2h 03m
$270
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Sat 5/2
3:35 pm-10:15 pm
1 stop6h 40m
Spokane
Sat 5/9
2:25 pm-8:45 pm
2 stops6h 20m
$276
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Wed 6/17
3:34 pm-7:57 pm
1 stop28h 23m
Spokane
Sun 6/21
8:47 pm-7:51 pm
1 stop23h 04m
$282
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Sat 5/23
1:20 pm-9:55 pm
1 stop7h 35m
Boise Air Term. Gowen Fld
Thu 5/28
6:00 am-12:10 pm
2 stops7h 10m
$287
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-GEG
ONT-BOI
ONT-TWF
ONT-JAC
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-GEG
ONT-BOI
ONT-TWF
ONT-JAC
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 April 8, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to Idaho at noon. If you’re flexible enough to do this you can expect to save up to 64% on your trip compared to booking a flight in the morning.
How much does it cost to fly round-trip from Ontario to Idaho?
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated April 8, 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.
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Food
7.0
Overall
8.0
Comfort
8.0
Crew
8.6
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.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Ontario to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Idaho by cabin class
Find flights from Ontario to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Idaho flights
Browse other Ontario and Idaho flight options. Last updated on April 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Idaho flights
Consider these flights traveling from Ontario to Idaho.
Top 4 airlines flying from Ontario to Idaho
Discover the top 4 airlines that operate flights from Ontario to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$137 | Average$253 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$153 | Average$358 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$190 | Average$358 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$315 | FlexibilityNo cancel fee | On-time69% |