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$69+ 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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap 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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/16. 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 12/241:47 pmGEG - ONT
1 stop7h 20mUnited Airlines
Thu 12/251:40 pmONT - GEG
1 stop7h 18mUnited Airlines
Deal found 12/16$329
This Alaska Airlines deal was found by Cheapflights users on 12/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:32 pmGEG - ONT
1 stop4h 27mAlaska Airlines
Mon 1/57:00 amONT - GEG
1 stop4h 39mAlaska Airlines
Deal found 12/18$362
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Fri 12/197:00 amJAC - ONT
1 stop6h 38mUnited Airlines
Fri 1/165:05 amONT - JAC
1 stop7h 16mUnited Airlines
Deal found 12/16$364
This Alaska Airlines deal was found by Cheapflights users on 12/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:32 pmGEG - ONT
1 stop4h 27mAlaska Airlines
Thu 1/16:00 amONT - GEG
1 stop6h 48mAlaska Airlines
Deal found 12/18$374
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2812:02 pmGEG - ONT
2 stops29h 13mMultiple Airlines
Fri 1/25:54 pmONT - GEG
1 stop16h 35mMultiple Airlines
Deal found 12/16$383
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/316:55 pmBOI - ONT
1 stop4h 38mUnited Airlines
Mon 1/55:05 amONT - BOI
1 stop7h 31mUnited Airlines
Deal found 12/16$391
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2610:52 pmIDA - ONT
1 stop25h 29mMultiple Airlines
Thu 1/16:07 pmONT - IDA
1 stop21h 05mMultiple Airlines
Deal found 12/17$396
This Delta deal was found by Cheapflights users on 12/16. 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.
Sat 12/205:45 pmJAC - ONT
1 stop5h 43mDelta
Fri 1/166:00 amONT - JAC
1 stop4h 58mDelta
Deal found 12/16$399
This Delta deal was found by Cheapflights users on 12/16. 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.
Thu 12/1812:55 pmJAC - ONT
2 stops10h 52mDelta
Fri 1/166:00 amONT - JAC
1 stop4h 58mDelta
Deal found 12/16$404
This Alaska Airlines deal was found by Cheapflights users on 12/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:32 pmGEG - ONT
1 stop4h 27mAlaska Airlines
Fri 1/26:05 pmONT - GEG
1 stop4h 55mAlaska Airlines
Deal found 12/18$429
This Southwest deal was found by Cheapflights users on 12/16. 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 12/235:25 pmBOI - ONT
1 stop7h 40mSouthwest
Mon 12/295:10 pmONT - BOI
1 stop5h 55mSouthwest
Deal found 12/16$437
This United Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:35 amBOI - ONT
1 stop4h 26mUnited Airlines
Sat 12/2010:42 amONT - BOI
1 stop4h 26mUnited Airlines
Deal found 12/17$443

Find flight deals from Idaho to Ontario

Keep the following information in mind while searching for Idaho to Ontario flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$97
(Alaska Airlines)

One-way from

$69
(Alaska Airlines)

Popular in

March

Cheapest in

April

Average price

$293

Good round-trip deal

$117 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Los Angeles flights.
Search Deals
From Idaho to Ontario
Search Deals
One-way flight from Idaho to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Idaho to Ontario.
Search Deals

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 December 18, 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

Sat 2/28

5:50 pm-6:57 pm

Nonstop2h 07m

Ontario

Wed 3/4

7:59 pm-10:58 pm

Nonstop1h 59m

$97

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 1/28

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Mon 2/2

7:56 pm-10:57 pm

Nonstop2h 01m

$107

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 2/2

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Sat 2/7

7:56 pm-10:57 pm

Nonstop2h 01m

$107

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 1/17

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Sat 1/24

7:56 pm-10:57 pm

Nonstop2h 01m

$137

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 1/22

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Mon 1/26

7:56 pm-10:57 pm

Nonstop2h 01m

$137

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 1/22

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Thu 1/29

7:56 pm-10:57 pm

Nonstop2h 01m

$137

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 2/21

5:50 pm-6:57 pm

Nonstop2h 07m

Ontario

Sat 2/28

6:00 am-11:03 am

1 stop28h 03m

$138

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 2/21

6:20 pm-9:44 pm

1 stop4h 24m

Ontario

Sat 2/28

7:30 am-4:15 pm

1 stop7h 45m

$147

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 1/12

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Sat 1/17

7:56 pm-10:57 pm

Nonstop2h 01m

$157

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 1/14

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Wed 1/21

7:56 pm-10:57 pm

Nonstop2h 01m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

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, March is the cheapest month in which you can book a flight from Idaho to Ontario (average of $75). Flying from Idaho to Ontario in November is currently the most expensive (average of $134). 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 December 18, 2025.

It’s optimal to fly from Idaho to Ontario in the afternoon. By choosing this option you can save up to 46% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Idaho to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to Ontario flight should consider departing on Thursday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 $97, Alaska Airlines can have you in Ontario from Idaho in 2h 07m. 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 United Airlines, with whom users have recently found tickets for as low as $98. However, be on the lookout for offers from Southwest and Alaska 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.

  • What are the cheapest flights from Idaho to Ontario?

    Looking at all options, your cheapest flight can be booked for $107. While the most popular route (Boise Air Term. Gowen Fld - Ontario) can be booked for $137 on average, our data indicates $157 when flying from Idaho to 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, March is the cheapest month in which you can book a flight from Idaho to Ontario (average of $75). Flying from Idaho to Ontario in November is currently the most expensive (average of $134). 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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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$137Average$283FlexibilityNo cancel feeOn-time75%
DeltaCheapest$158Average$364FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$211Average$316FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$365FlexibilityNo cancel feeOn-time63%

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