$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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Jun 4 — Jun 111
Round-trip
1 adult, Economy
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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
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Cheapest flights from Ontario to IdahoExplore the most affordable flight options available from Ontario to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 5, 2026.
Explore the most affordable flight options available from Ontario to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 5, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/267:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Wed 6/34:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$157
This Frontier deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/21:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 4/30![Frontier logo]()
$160
This Southwest deal was found by Cheapflights users on 5/5. 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 6/25:20 pm
ONT
- BOI
1 stop5h 00m
Southwest
Tue 6/96:00 am
BOI
- ONT
1 stop4h 05m
Southwest
Deal found 5/5![Southwest logo]()
$177
This Frontier deal was found by Cheapflights users on 5/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/46:00 am
ONT
- BOI
1 stop5h 38m
Frontier
Tue 6/91:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/4![Frontier logo]()
$180
This Expedia deal was found by Cheapflights users on 5/4. 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.
Wed 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 6/1012:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/4![Frontier logo]()
$185
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/287:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 5/304:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$187
This Frontier deal was found by Cheapflights users on 5/4. 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 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
Wed 6/312:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/4![Frontier logo]()
$190
This Frontier deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/301:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/1![Frontier logo]()
$190
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/261:35 pm
ONT
- BOI
1 stop7h 38m
Delta
Tue 6/26:41 pm
BOI
- ONT
1 stop5h 53m
Delta
Deal found 4/30![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 5/286:00 pm
ONT
- BOI
1 stop6h 00m
Southwest
Sat 5/306:05 am
BOI
- ONT
2 stops7h 15m
Southwest
Deal found 5/3![Southwest logo]()
$202
This Frontier deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 6/1712:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/1![Frontier logo]()
$205
This Expedia deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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.
Sun 5/106:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Sun 5/171:22 pm
BOI
- ONT
1 stop21h 43m
Frontier
Deal found 5/3![Frontier logo]()
$206
Best flights from Ontario to IdahoDiscover carefully curated flight deals from Ontario to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 5, 2026.
Discover carefully curated flight deals from Ontario to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 5, 2026.
This Southwest deal was found by Cheapflights users on 5/5. 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 6/23:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Tue 6/92:05 pm
BOI
- ONT
1 stop6h 35m
Southwest
Deal found 5/5![Southwest logo]()
$182
This Alaska Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/24:03 pm
ONT
- BOI
1 stop6h 55m
Alaska Airlines
Wed 6/34:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 5/4. 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 5/271:35 pm
ONT
- GEG
1 stop5h 08m
Delta
Sat 5/305:37 pm
GEG
- ONT
1 stop4h 57m
Delta
Deal found 5/4![Delta logo]()
$263
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:00 am
ONT
- SUN
1 stop7h 47m
United Airlines
Wed 6/107:00 am
SUN
- ONT
1 stop6h 47m
United Airlines
Deal found 5/3![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 5/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/15:30 pm
ONT
- BOI
1 stop4h 25m
Southwest
Fri 6/55:10 am
BOI
- ONT
1 stop7h 10m
Southwest
Deal found 5/4![Southwest logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 5/5. 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 6/27:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Tue 6/96:35 am
BOI
- ONT
1 stop18h 23m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$260
This Delta deal was found by Cheapflights users on 5/5. 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 6/236:20 am
ONT
- GEG
1 stop5h 32m
Delta
Tue 6/305:30 am
GEG
- ONT
1 stop5h 52m
Delta
Deal found 5/5![Delta logo]()
$263
This Delta deal was found by Cheapflights users on 5/5. 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.
Sat 5/305:45 pm
ONT
- GEG
1 stop6h 14m
Delta
Sun 5/316:10 am
GEG
- ONT
1 stop5h 02m
Delta
Deal found 5/5![Delta logo]()
$264
This Southwest deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/118:45 pm
ONT
- BOI
1 stop4h 00m
Southwest
Mon 6/157:20 pm
BOI
- ONT
1 stop3h 55m
Southwest
Deal found 4/30![Southwest logo]()
$297
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:00 am
ONT
- SUN
1 stop7h 47m
United Airlines
Tue 6/98:00 am
SUN
- ONT
1 stop5h 12m
United Airlines
Deal found 5/2![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/276:00 am
ONT
- IDA
1 stop3h 47m
Delta
Sat 5/306:54 pm
IDA
- ONT
1 stop4h 51m
Delta
Deal found 4/30![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/24:03 pm
ONT
- GEG
1 stop5h 15m
Alaska Airlines
Wed 6/36:00 am
GEG
- ONT
1 stop5h 12m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$351
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/301:40 pm
ONT
- SUN
1 stop7h 11m
United Airlines
Sat 6/62:38 pm
SUN
- ONT
1 stop7h 08m
United Airlines
Deal found 4/30![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 10/16:10 pm
ONT
- BOI
2 stops6h 35m
Southwest
Sun 10/46:50 am
BOI
- ONT
1 stop5h 40m
Southwest
Deal found 5/3![Southwest logo]()
$344
This Alaska Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 6/57:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sun 6/76:35 am
BOI
- ONT
1 stop5h 35m
Alaska Airlines
Deal found 5/3![Alaska Airlines logo]()
$360
This Delta deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:40 am
ONT
- JAC
1 stop6h 20m
Delta
Wed 7/296:05 pm
JAC
- ONT
1 stop6h 43m
Delta
Deal found 5/3![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/253:50 pm
ONT
- BOI
2 stops7h 35m
Southwest
Sun 7/268:20 pm
BOI
- ONT
1 stop3h 50m
Southwest
Deal found 4/30![Southwest logo]()
$344
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 5/1![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 8/1112:55 pm
ONT
- JAC
1 stop5h 00m
Delta
Fri 8/216:01 pm
JAC
- ONT
1 stop6h 33m
Delta
Deal found 5/3![Delta logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:03 pm
ONT
- IDA
1 stop5h 50m
Alaska Airlines
Sat 5/301:54 pm
IDA
- ONT
1 stop6h 08m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:30 am
ONT
- BOI
2 stops7h 55m
Southwest
Wed 7/292:05 pm
BOI
- ONT
2 stops7h 15m
Southwest
Deal found 5/1![Southwest logo]()
$349
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/196:00 am
ONT
- BOI
1 stop4h 27m
United Airlines
Thu 5/287:05 pm
BOI
- ONT
1 stop4h 32m
United Airlines
Deal found 4/30![United Airlines logo]()
$397
This Alaska Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 7/104:18 pm
ONT
- BOI
Nonstop1h 55m
Alaska Airlines
Wed 7/156:13 pm
BOI
- ONT
1 stop5h 58m
Alaska Airlines
Deal found 5/3![Alaska Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/33:45 pm
ONT
- GEG
1 stop7h 00m
Southwest
Wed 6/175:00 am
GEG
- ONT
2 stops7h 55m
Southwest
Deal found 5/1![Southwest logo]()
$356
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 6/81:50 pm
ONT
- JAC
1 stop6h 40m
United Airlines
Tue 6/168:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 4/30![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 7/114:18 pm
ONT
- GEG
1 stop5h 15m
Alaska Airlines
Tue 7/1411:40 am
GEG
- ONT
1 stop4h 50m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$381
This Delta deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/261:29 pm
ONT
- IDA
1 stop3h 45m
Delta
Fri 5/296:54 pm
IDA
- ONT
1 stop5h 40m
Delta
Deal found 5/3![Delta logo]()
$381
This Southwest deal was found by Cheapflights users on 5/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/248:45 pm
ONT
- GEG
1 stop4h 35m
Southwest
Mon 7/275:00 am
GEG
- ONT
1 stop5h 30m
Southwest
Deal found 5/4![Southwest logo]()
$361
This United Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 7/251:50 pm
ONT
- JAC
1 stop6h 40m
United Airlines
Wed 7/298:00 am
JAC
- ONT
1 stop5h 12m
United Airlines
Deal found 5/3![United Airlines logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 7/165:26 pm
ONT
- GEG
1 stop5h 10m
Alaska Airlines
Tue 7/216:13 am
GEG
- ONT
1 stop6h 56m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$381
Last-minute flights from Ontario to IdahoDiscover last-minute flight deals from Ontario to Idaho. Data last updated May 5, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Idaho. Data last updated May 5, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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.
Sun 5/106:00 am
ONT
- BOI
1 stop5h 27m
Frontier
Sun 5/171:22 pm
BOI
- ONT
1 stop21h 43m
Frontier
Deal found 5/3![Frontier logo]()
$206
This Frontier deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/21:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 4/30![Frontier logo]()
$160
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/267:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Wed 6/34:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/266:00 am
ONT
- BOI
1 stop4h 56m
Delta
Wed 6/36:00 pm
BOI
- ONT
1 stop5h 32m
Delta
Deal found 4/30![Delta logo]()
$197
This Frontier deal was found by Cheapflights users on 5/4. 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 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
Wed 6/312:33 pm
GEG
- ONT
1 stop11h 16m
Frontier
Deal found 5/4![Frontier logo]()
$190
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/287:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Sat 5/304:14 pm
BOI
- ONT
Nonstop2h 03m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” 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 5/286:00 pm
ONT
- BOI
1 stop6h 00m
Southwest
Sat 5/306:05 am
BOI
- ONT
2 stops7h 15m
Southwest
Deal found 5/3![Southwest logo]()
$202
This Southwest deal was found by Cheapflights users on 5/5. 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 6/25:20 pm
ONT
- BOI
1 stop5h 00m
Southwest
Tue 6/96:00 am
BOI
- ONT
1 stop4h 05m
Southwest
Deal found 5/5![Southwest logo]()
$177
This Expedia deal was found by Cheapflights users on 5/4. 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.
Wed 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 6/1012:31 pm
GEG
- ONT
1 stop21h 34m
Frontier
Deal found 5/4![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/36:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Wed 6/1712:31 pm
GEG
- ONT
1 stop11h 18m
Frontier
Deal found 5/1![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 5/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/46:00 am
ONT
- BOI
1 stop5h 38m
Frontier
Tue 6/91:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/4![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/236:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Tue 6/301:25 pm
BOI
- ONT
1 stop11h 24m
Frontier
Deal found 5/1![Frontier logo]()
$190
One-way flights from Ontario to IdahoSearch for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated May 5, 2026.
Search for one-way flight options from Ontario to Idaho. Find affordable one-way fares based on user searches. Data last updated May 5, 2026.
This Priceline deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/1![Frontier logo]()
$70
This Southwest deal was found by Cheapflights users on 5/5. 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.
Wed 5/273:45 pm
ONT
- BOI
1 stop6h 35m
Southwest
Deal found 5/5![Southwest logo]()
$89
This Frontier deal was found by Cheapflights users on 5/4. 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 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 5/4![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/76:00 am
ONT
- BOI
1 stop5h 38m
Frontier
Deal found 5/2![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 5/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:00 am
ONT
- BOI
1 stop29h 30m
Frontier
Deal found 5/5![Frontier logo]()
$93
This Southwest deal was found by Cheapflights users on 5/5. 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.
Wed 6/33:45 pm
ONT
- BOI
2 stops7h 40m
Southwest
Deal found 5/5![Southwest logo]()
$94
This Frontier deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 7/86:00 am
ONT
- GEG
1 stop5h 37m
Frontier
Deal found 5/1![Frontier logo]()
$95
This Frontier deal was found by Cheapflights users on 5/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
- BOI
1 stop5h 09m
Frontier
Deal found 5/4![Frontier logo]()
$95
This Alaska Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/67:48 pm
ONT
- BOI
Nonstop1h 59m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$109
This Southwest deal was found by Cheapflights users on 5/5. 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.
Mon 6/15:05 pm
ONT
- BOI
2 stops6h 55m
Southwest
Deal found 5/5![Southwest logo]()
$114
This Frontier deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/256:00 am
ONT
- GEG
1 stop5h 38m
Frontier
Deal found 5/3![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 5/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/146:00 am
ONT
- BOI
1 stop5h 30m
Frontier
Deal found 5/4![Frontier logo]()
$115
Find flight deals from Ontario to Idaho
Keep the following information in mind while searching for Ontario to Idaho flight deals. Data was last updated May 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $157 (Alaska Airlines) |
One-way from | $70 (Priceline) |
Popular in | February |
Cheapest in | April |
Average price | $277 |
Good round-trip deal | $157 or less |
Good one-way deal | $180 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Idaho that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 5, 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
Tue 6/2
3:45 pm-12:25 am
2 stops7h 40m
Boise Air Term. Gowen Fld
Tue 6/9
2:05 pm-7:40 pm
1 stop6h 35m
$182
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Mon 6/1
5:30 pm-10:55 pm
1 stop4h 25m
Boise Air Term. Gowen Fld
Fri 6/5
5:10 am-11:20 am
1 stop7h 10m
$217
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 6/2
4:03 pm-11:58 pm
1 stop6h 55m
Boise Air Term. Gowen Fld
Wed 6/3
4:14 pm-5:17 pm
Nonstop2h 03m
$247
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Tue 6/2
7:48 pm-10:47 pm
Nonstop1h 59m
Boise Air Term. Gowen Fld
Tue 6/9
6:35 am-11:58 pm
1 stop18h 23m
$260
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Wed 5/27
1:35 pm-6:43 pm
1 stop5h 08m
Spokane
Sat 5/30
5:37 pm-10:34 pm
1 stop4h 57m
$263
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Tue 6/23
6:20 am-11:52 am
1 stop5h 32m
Spokane
Tue 6/30
5:30 am-11:22 am
1 stop5h 52m
$263
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Sat 5/30
5:45 pm-11:59 pm
1 stop6h 14m
Spokane
Sun 5/31
6:10 am-11:12 am
1 stop5h 02m
$264
OntarioBoise
ONT - BOI
ONTBOI
Ontario
Thu 6/11
8:45 pm-1:45 am
1 stop4h 00m
Boise Air Term. Gowen Fld
Mon 6/15
7:20 pm-10:15 pm
1 stop3h 55m
$297
OntarioIdaho Falls
ONT - IDA
ONTIDA
Ontario
Wed 5/27
6:00 am-10:47 am
1 stop3h 47m
Idaho Falls Fanning Field
Sat 5/30
6:54 pm-10:45 pm
1 stop4h 51m
$309
OntarioJackson
ONT - JAC
ONTJAC
Ontario
Tue 7/21
9:40 am-5:00 pm
1 stop6h 20m
Jackson Hole
Wed 7/29
6:05 pm-11:48 pm
1 stop6h 43m
$329
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-IDA
ONT-SUN
ONT-JAC
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-IDA
ONT-SUN
How far ahead should I book a flight from Ontario to Idaho?
To ensure you get the cheapest price possible for a flight from Ontario to Idaho, you should look to book at least 27 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Ontario to Idaho?
Currently, January is the cheapest month in which you can book a flight from Ontario to Idaho (average of $97). Flying from Ontario to Idaho in November is currently the most expensive (average of $196). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to ID?
Find hourly flight availability from Ontario to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 5, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to Idaho at noon. If you’re flexible enough to do this you can expect to save up to 62% on your trip compared to booking a flight in the morning.
Weekly flight availability from Ontario to Idaho
Explore weekly flight availability from Ontario to Idaho. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 5, 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 May 5, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, 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.
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Food
7.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
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 May 5, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Idaho flights
Consider these flights traveling from Ontario to Idaho.
Top 4 airlines flying from Ontario to Idaho
Discover the top 4 airlines that operate flights from Ontario to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$97 | Average$250 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$153 | Average$399 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$176 | Average$358 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$315 | FlexibilityNo cancel fee | On-time69% |