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$84+ Cheap flights from Idaho to Ontario (ONT)

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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Idaho to Ontario

Keep the following information in mind while searching for Idaho to Ontario flight deals. Data was last updated September 17, 2025.

Round-trip from

$167
(Delta)

One-way from

$84
(Delta)

Popular in

March

Cheapest in

April

Average price

$257
From Idaho to Ontario
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One-way flight from Idaho to Ontario
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Idaho to Ontario

Cheapest flights from Idaho to Ontario
Explore the most affordable flight options available from Idaho to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/74:46 pmBOI - ONT
1 stop6h 55mDelta
Tue 10/145:50 pmONT - BOI
1 stop5h 18mDelta
Deal found 9/16$167
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:28 amBOI - ONT
1 stop5h 37mHawaiian Airlines
Wed 10/294:11 pmONT - BOI
1 stop5h 09mHawaiian Airlines
Deal found 9/15$216
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/197:20 amBOI - ONT
1 stop4h 15mSouthwest
Sat 11/223:40 pmONT - BOI
1 stop6h 20mSouthwest
Deal found 9/15$217
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/74:15 pmBOI - ONT
2 stops6h 50mSouthwest
Tue 10/143:50 pmONT - BOI
1 stop5h 20mSouthwest
Deal found 9/16$222
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/157:15 amGEG - ONT
1 stop4h 58mUnited Airlines
Thu 10/166:36 pmONT - GEG
1 stop4h 39mUnited Airlines
Deal found 9/16$223
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/86:30 amBOI - ONT
1 stop7h 07mHawaiian Airlines
Sat 10/115:45 pmONT - BOI
1 stop5h 12mHawaiian Airlines
Deal found 9/15$226
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 12/245:50 pmBOI - ONT
1 stop3h 55mSouthwest
Sun 12/286:45 pmONT - BOI
1 stop3h 45mSouthwest
Deal found 9/15$237
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:37 amBOI - ONT
1 stop10h 24mAmerican Airlines
Thu 11/1312:55 pmONT - BOI
1 stop9h 42mAmerican Airlines
Deal found 9/16$243
This Delta deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/234:50 pmGEG - ONT
1 stop6h 49mDelta
Sat 10/259:50 amONT - GEG
2 stops6h 54mDelta
Deal found 9/17$244
This Alaska Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/105:38 pmBOI - ONT
1 stop7h 25mAlaska Airlines
Tue 10/145:45 pmONT - BOI
1 stop5h 12mAlaska Airlines
Deal found 9/15$246
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/75:54 pmGEG - ONT
1 stop6h 09mAlaska Airlines
Tue 10/147:43 pmONT - GEG
1 stop4h 44mAlaska Airlines
Deal found 9/16$250
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3012:03 pmGEG - ONT
1 stop11h 47mFrontier
Sat 11/1512:05 pmONT - GEG
1 stop23h 03mFrontier
Deal found 9/16$252

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho to Ontario 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 September 17, 2025.
Use the filters below to find and compare flights from Idaho to Ontario that are best for you.

Fly from

Idaho

Fly to

Ontario

Route

Depart

Return

Price

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 11/19

7:20 am-10:35 am

1 stop4h 15m

Ontario

Sat 11/22

3:40 pm-11:00 pm

1 stop6h 20m

$217

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 10/7

4:15 pm-10:05 pm

2 stops6h 50m

Ontario

Tue 10/14

3:50 pm-10:10 pm

1 stop5h 20m

$222

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Thu 10/23

4:50 pm-11:39 pm

1 stop6h 49m

Ontario

Sat 10/25

9:50 am-3:53 pm

1 stop6h 03m

$223

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 1/19

1:15 pm-6:17 pm

1 stop6h 02m

Ontario

Wed 2/4

6:00 am-12:10 pm

1 stop5h 10m

$236

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sun 2/15

4:30 pm-5:42 pm

Nonstop2h 12m

Ontario

Sat 2/21

6:22 pm-9:39 pm

Nonstop2h 17m

$247

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 2/17

4:30 pm-5:42 pm

Nonstop2h 12m

Ontario

Sat 2/21

6:22 pm-9:39 pm

Nonstop2h 17m

$247

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 2/16

4:30 pm-5:42 pm

Nonstop2h 12m

Ontario

Sat 2/21

6:22 pm-9:39 pm

Nonstop2h 17m

$247

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Tue 3/3

3:30 pm-7:47 pm

1 stop4h 17m

Ontario

Wed 3/4

6:55 pm-12:14 am

1 stop5h 19m

$250

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Tue 10/7

5:54 pm-12:03 am

1 stop6h 09m

Ontario

Tue 10/14

7:43 pm-12:27 am

1 stop4h 44m

$250

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 12/3

2:30 pm-8:00 pm

1 stop6h 30m

Ontario

Wed 12/17

2:05 pm-10:25 pm

2 stops7h 20m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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Best time to book a flight from Idaho to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Idaho with our price prediction graph.
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 Idaho to Ontario

What is the cheapest month to book a flight from Idaho to Ontario?

Currently, August is the cheapest month in which you can book a flight from Idaho to Ontario (average of $246). Flying from Idaho to Ontario in March is currently the most expensive (average of $327). 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 ID to ONT?

Find hourly flight availability from Idaho to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

When flying from Idaho to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Idaho?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from Idaho.

  • How long is the flight from Idaho to Ontario?

    For as low as $217, Southwest can have you in Ontario from Idaho in 4h 15m. The distance from Idaho to Ontario is about 661 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Idaho to Ontario one-way?

    The cheapest airline one-way is Hawaiian Airlines, with whom users have recently found tickets for as low as $108. However, be on the lookout for offers from Alaska Airlines and United Airlines, as they are both options that can get you from Idaho to Ontario for a low price.

  • What are the most popular routes from Idaho to Ontario?

    The most popular flight routes from Idaho to Ontario are Boise Air Term. Gowen Fld - Ontario, Spokane - Ontario and Idaho Falls Fanning Field - Ontario.

  • Can I find deals for flights from Idaho to Ontario that include hotel bookings?

    Yes. In addition to deals on Idaho to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Ontario.

  • Can I find deals for business class flights from Idaho to Ontario?

    Yes. Cheapflights offers flight deals from Idaho to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Idaho to Ontario (average of $246). Flying from Idaho to Ontario in March is currently the most expensive (average of $327). 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.

See more FAQs

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Alternative routes for Idaho to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Idaho to Ontario

Discover the top 4 airlines that operate flights from Idaho to Ontario. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$156Average$359FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$214Average$308FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$225Average$363FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$232Average$353FlexibilityNo cancel feeOn-time69%

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