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Ontario

$102+ 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Jul 10 — Jul 171
Fri 7/10
Fri 7/17
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 June 10, 2026.

This Priceline deal was found by Cheapflights users on 6/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/32:51 pm
BOI
-
ONT
Nonstop2h 11m
Alaska Airlines
Tue 10/64:42 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Deal found 6/6$177
This CheapOair deal was found by Cheapflights users on 6/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/33:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Tue 9/84:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 6/5$187
This CheapOair deal was found by Cheapflights users on 6/9. 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.
Sat 8/293:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Sat 9/54:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 6/9$197
This Delta deal was found by Cheapflights users on 6/8. 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.
Tue 8/256:45 pm
BOI
-
ONT
1 stop5h 49m
Delta
Tue 9/16:00 am
ONT
-
BOI
1 stop5h 14m
Delta
Deal found 6/8$203
This Southwest deal was found by Cheapflights users on 6/7. 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 9/2311:40 am
BOI
-
ONT
1 stop5h 20m
Southwest
Tue 9/293:00 pm
ONT
-
BOI
1 stop6h 15m
Southwest
Deal found 6/7$204
This Priceline deal was found by Cheapflights users on 6/9. 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 9/243:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Mon 9/284:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 6/9$207
This Southwest deal was found by Cheapflights users on 6/10. 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 10/712:50 pm
BOI
-
ONT
1 stop6h 40m
Southwest
Tue 10/135:25 pm
ONT
-
BOI
1 stop3h 55m
Southwest
Deal found 6/10$216
This Delta deal was found by Cheapflights users on 6/8. 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 10/175:45 pm
BOI
-
ONT
1 stop7h 03m
Delta
Sun 11/15:05 pm
ONT
-
BOI
1 stop5h 59m
Delta
Deal found 6/8$217
This Southwest deal was found by Cheapflights users on 6/10. 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 10/711:35 am
BOI
-
ONT
1 stop5h 25m
Southwest
Wed 10/148:15 am
ONT
-
BOI
1 stop4h 00m
Southwest
Deal found 6/10$220
This United Airlines deal was found by Cheapflights users on 6/9. 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 8/47:05 pm
BOI
-
ONT
1 stop4h 32m
United Airlines
Sat 8/81:50 pm
ONT
-
BOI
1 stop5h 15m
United Airlines
Deal found 6/9$223
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/2010:12 am
GEG
-
ONT
1 stop9h 36m
Multiple Airlines
Wed 8/263:34 pm
ONT
-
GEG
1 stop17h 48m
Multiple Airlines
Deal found 6/10$243
This Booking.com deal was found by Cheapflights users on 6/9. 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.
Wed 8/57:45 pm
GEG
-
ONT
1 stop15h 29m
Alaska Airlines
Sat 8/84:18 pm
ONT
-
GEG
1 stop5h 15m
Alaska Airlines
Deal found 6/9$260

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 June 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(Priceline)

One-way from

$102
(Delta)

Popular in

March

Cheapest in

October

Average price

$307

Good round-trip deal

$287 or less

Good one-way deal

$168 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Los Angeles Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Los Angeles 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. 7% potential increase in price ($21 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 June 2026
Search Deals
Price to beat on a round-trip flight from Idaho to Ontario.
Search Deals
Price to beat on a one-way 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 June 10, 2026.
Use the filters below to find and compare flights from Idaho to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 10/7

12:50 pm-6:30 pm

1 stop6h 40m

Ontario

Tue 10/13

5:25 pm-10:20 pm

1 stop3h 55m

$216

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 9/29

3:02 pm-4:10 pm

Nonstop2h 08m

Ontario

Wed 9/30

4:50 pm-7:45 pm

Nonstop1h 55m

$257

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Sat 9/19

5:52 am-11:16 am

1 stop5h 24m

Ontario

Tue 9/22

6:02 am-12:39 pm

1 stop6h 37m

$260

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Wed 8/19

5:52 am-11:04 am

1 stop5h 12m

Ontario

Mon 8/24

6:05 pm-11:11 pm

1 stop5h 06m

$260
Quickest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 8/6

2:31 pm-3:38 pm

Nonstop2h 07m

Ontario

Mon 8/10

4:18 pm-7:13 pm

Nonstop1h 55m

$287

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 7/25

2:31 pm-3:38 pm

Nonstop2h 07m

Ontario

Sun 7/26

4:18 pm-7:13 pm

Nonstop1h 55m

$287

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 7/24

2:31 pm-3:38 pm

Nonstop2h 07m

Ontario

Mon 7/27

4:18 pm-7:13 pm

Nonstop1h 55m

$287

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Fri 10/16

5:15 am-12:30 pm

1 stop7h 15m

Ontario

Wed 10/21

1:00 pm-8:45 pm

1 stop7h 45m

$301

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 7/8

6:00 am-8:47 am

1 stop3h 47m

Ontario

Sun 7/12

6:00 am-12:14 pm

1 stop5h 14m

$307

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 7/3

7:25 am-12:10 pm

1 stop5h 45m

Ontario

Mon 7/6

5:21 pm-12:09 am

1 stop5h 48m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from Idaho to Ontario (average of $107). Flying from Idaho to Ontario in December is currently the most expensive (average of $301). 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 June 10, 2026.

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.

Weekly flight availability from Idaho to Ontario

Explore weekly flight availability from Idaho to Ontario. 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 June 10, 2026.

The most flights from USID to ONT 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 Idaho to Ontario?

How far ahead should I book a flight from Idaho to Ontario?

To ensure you get the cheapest price possible for a flight from Idaho to Ontario, you should look to book at least 38 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.

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 $257, Southwest can have you in Ontario from Idaho in 2h 08m. 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 Delta, with whom users have recently found tickets for as low as $78. However, be on the lookout for offers from United Airlines and Southwest, 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 Spokane - Ontario, Boise Air Term. Gowen Fld - 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 $138. While the most popular route (Spokane - Ontario) can be booked for $275 on average, our data indicates $318 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, January is the cheapest month in which you can book a flight from Idaho to Ontario (average of $107). Flying from Idaho to Ontario in December is currently the most expensive (average of $301). 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 June 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$277FlexibilityNo cancel feeOn-time75%
DeltaCheapest$120Average$325FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$143Average$441FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$204Average$364FlexibilityNo cancel feeOn-time63%

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