HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$89+ 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 6/6. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Jun 18 — Jun 251
Thu 6/18
Thu 6/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho to Ontario 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 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 May 19, 2026.

This CheapOair deal was found by Cheapflights users on 5/19. 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 9/163:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Sat 9/194:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 5/19$177
This Alaska Airlines deal was found by Cheapflights users on 5/19. 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 8/193:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Sat 8/224:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 5/19$197
This CheapOair deal was found by Cheapflights users on 5/19. 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 9/103:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Mon 9/144:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 5/19$207
This Frontier deal was found by Cheapflights users on 5/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/271:04 pm
BOI
-
ONT
1 stop11h 45m
Frontier
Tue 9/16:00 am
ONT
-
BOI
1 stop5h 09m
Frontier
Deal found 5/17$218
This Frontier deal was found by Cheapflights users on 5/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/301:25 pm
BOI
-
ONT
1 stop11h 24m
Frontier
Thu 7/26:00 am
ONT
-
BOI
1 stop5h 30m
Frontier
Deal found 5/18$223
This Alaska Airlines deal was found by Cheapflights users on 5/18. 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.
Thu 8/276:23 am
BOI
-
ONT
1 stop5h 41m
Alaska Airlines
Tue 9/14:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 5/18$227
This Frontier deal was found by Cheapflights users on 5/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/111:25 pm
BOI
-
ONT
1 stop11h 24m
Frontier
Thu 7/166:00 am
ONT
-
BOI
1 stop5h 29m
Frontier
Deal found 5/15$228
This Expedia deal was found by Cheapflights users on 5/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1712:31 pm
GEG
-
ONT
1 stop21h 34m
Frontier
Mon 6/226:00 am
ONT
-
GEG
1 stop5h 36m
Frontier
Deal found 5/18$230
This Expedia deal was found by Cheapflights users on 5/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/54:14 pm
BOI
-
ONT
Nonstop2h 03m
Alaska Airlines
Mon 6/87:48 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Deal found 5/15$237
This Expedia deal was found by Cheapflights users on 5/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/141:25 pm
BOI
-
ONT
1 stop21h 38m
Frontier
Tue 7/216:00 am
ONT
-
BOI
1 stop5h 29m
Frontier
Deal found 5/18$244
This Frontier deal was found by Cheapflights users on 5/14. 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 6/91:25 pm
BOI
-
ONT
1 stop11h 24m
Frontier
Thu 6/116:00 am
ONT
-
BOI
1 stop5h 30m
Frontier
Deal found 5/14$249
This Frontier deal was found by Cheapflights users on 5/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1012:32 pm
GEG
-
ONT
1 stop11h 18m
Frontier
Mon 7/136:00 am
ONT
-
GEG
1 stop5h 37m
Frontier
Deal found 5/15$249

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 May 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(CheapOair)

One-way from

$89
(American Airlines)

Popular in

March

Cheapest in

October

Average price

$267

Good round-trip deal

$157 or less

Good one-way deal

$218 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 ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 19, 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

Thu 8/27

6:23 am-11:04 am

1 stop5h 41m

Ontario

Tue 9/1

4:50 pm-7:45 pm

Nonstop1h 55m

$227

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 10/23

2:51 pm-4:02 pm

Nonstop2h 11m

Ontario

Sun 11/1

5:12 pm-8:12 pm

Nonstop2h 00m

$237

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 9/16

5:45 pm-11:44 pm

1 stop6h 59m

Ontario

Sat 9/19

5:05 pm-11:56 pm

1 stop5h 51m

$257

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 9/14

7:05 pm-10:59 pm

1 stop4h 54m

Ontario

Sat 9/19

5:00 am-1:38 pm

1 stop7h 38m

$277
Quickest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 9/5

3:02 pm-4:10 pm

Nonstop2h 08m

Ontario

Mon 9/7

4:50 pm-7:45 pm

Nonstop1h 55m

$287

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 11/5

5:45 pm-11:48 pm

1 stop7h 03m

Ontario

Sun 11/8

5:05 pm-12:04 am

1 stop5h 59m

$297

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 6/8

6:07 pm-11:58 pm

1 stop6h 51m

Ontario

Tue 6/9

7:48 pm-10:47 pm

Nonstop1h 59m

$297

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sun 8/16

6:44 pm-11:34 pm

1 stop5h 50m

Ontario

Sun 8/23

12:55 pm-5:52 pm

1 stop3h 57m

$307

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sun 8/2

6:00 am-8:47 am

1 stop3h 47m

Ontario

Mon 8/3

12:55 pm-5:52 pm

1 stop3h 57m

$307

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 6/8

6:07 pm-11:58 pm

1 stop6h 51m

Ontario

Sat 6/13

4:18 pm-7:13 pm

Nonstop1h 55m

$312

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/14

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 May 19, 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 May 19, 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 $277, Alaska Airlines can have you in Ontario from Idaho in 4h 54m. 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 Boise Air Term. Gowen Fld - Ontario, Spokane - Ontario and Idaho Falls Fanning Field - Ontario.

  • What are the most reliable airlines from Idaho to Ontario?

    Before booking your flight to Ontario from Idaho, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (100%), Alaska Airlines (88%), Horizon Air( 80%).

  • What are the cheapest flights from Idaho to Ontario?

    Looking at all options, your cheapest flight can be booked for $157. While the most popular route (Boise Air Term. Gowen Fld - Ontario) can be booked for $197 on average, our data indicates $285 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

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 for Idaho to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Newark to San Francisco flights
John F Kennedy Intl to San Francisco flights
LaGuardia to San Francisco flights
Newark to Los Angeles flights
Dallas/Fort Worth to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
John F Kennedy Intl to Los Angeles flights
Seattle to Los Angeles flights
Seattle to Las Vegas flights
O'Hare Intl to Las Vegas flights
Hobby to Las Vegas flights
Newark to Las Vegas flights
San Francisco to Las Vegas flights
Santa Rosa to Los Angeles flights
Dulles Intl to Las Vegas flights
Atlanta to Las Vegas flights
O'Hare Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Dulles Intl to Los Angeles flights
Los Angeles to Las Vegas flights
George Bush Intcntl to Las Vegas flights
LaGuardia to Los Angeles flights
Hobby to Los Angeles flights
Dallas/Fort Worth to San Francisco flights
John F Kennedy Intl to Ontario flights
Seattle to San Francisco flights
LaGuardia to Las Vegas flights
Reagan-National to Los Angeles flights
Baltimore to Las Vegas flights
John F Kennedy Intl to San Jose flights
Newark to San Jose flights
Santa Ana to Las Vegas flights
Atlanta to Los Angeles flights
Reagan-National to Las Vegas flights
Baltimore to Los Angeles flights
John F Kennedy Intl to Oakland flights
Denver to Las Vegas flights
George Bush Intcntl to Los Angeles flights
Dulles Intl to San Francisco flights
Los Angeles to San Francisco flights
Seattle to San Diego flights
Boston to Las Vegas flights
San Francisco to Los Angeles flights
Dallas/Fort Worth to Ontario flights
Orlando to Las Vegas flights
Seattle to Ontario flights
Boston to San Francisco flights
Boston to Los Angeles flights
O'Hare Intl to San Francisco flights
Dallas/Fort Worth to San Diego flights

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 May 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$277FlexibilityNo cancel feeOn-time75%
DeltaCheapest$120Average$321FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$143Average$456FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$204Average$363FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.