HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Idaho

$94+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

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 Ontario to Idaho

Cheapest flights from Ontario to Idaho
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 July 23, 2026.

This Alaska Airlines deal was found by Cheapflights users on 7/22. 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 8/294:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Tue 9/13:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Deal found 7/22$177
This Southwest deal was found by Cheapflights users on 7/20. 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 8/225:40 am
ONT
-
BOI
1 stop5h 35m
Southwest
Tue 8/256:00 am
BOI
-
ONT
1 stop3h 55m
Southwest
Deal found 7/20$187
This Alaska Airlines deal was found by Cheapflights users on 7/23. 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 10/226:45 pm
ONT
-
BOI
Nonstop2h 01m
Alaska Airlines
Tue 10/272:51 pm
BOI
-
ONT
Nonstop2h 11m
Alaska Airlines
Deal found 7/23$197
This Vliegwinkel deal was found by Cheapflights users on 7/19. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:12 am
ONT
-
BOI
1 stop5h 09m
Alaska Airlines
Sun 8/236:00 am
BOI
-
ONT
1 stop4h 51m
Alaska Airlines
Deal found 7/19$200
This Southwest deal was found by Cheapflights users on 7/21. 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 8/252:10 pm
ONT
-
BOI
2 stops7h 05m
Southwest
Fri 8/287:30 am
BOI
-
ONT
1 stop6h 55m
Southwest
Deal found 7/21$202
This Booking.com deal was found by Cheapflights users on 7/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/214:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Mon 8/243:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Deal found 7/19$203
This Southwest deal was found by Cheapflights users on 7/21. 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 9/185:45 pm
ONT
-
BOI
1 stop4h 50m
Southwest
Mon 9/217:00 am
BOI
-
ONT
1 stop6h 40m
Southwest
Deal found 7/21$207
This Booking.com deal was found by Cheapflights users on 7/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:45 pm
ONT
-
BOI
Nonstop2h 01m
Alaska Airlines
Mon 10/124:54 pm
BOI
-
ONT
Nonstop2h 11m
Alaska Airlines
Deal found 7/19$208
This Southwest deal was found by Cheapflights users on 7/22. 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 8/214:10 pm
ONT
-
BOI
2 stops6h 25m
Southwest
Sun 8/237:30 am
BOI
-
ONT
1 stop4h 10m
Southwest
Deal found 7/22$222
This Kiwi.com deal was found by Cheapflights users on 7/23. 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 8/273:40 pm
ONT
-
IDA
1 stop17h 42m
Multiple Airlines
Mon 8/318:33 pm
IDA
-
ONT
2 stops18h 30m
Multiple Airlines
Deal found 7/23$247
This Kiwi.com deal was found by Cheapflights users on 7/22. 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 8/64:09 pm
ONT
-
IDA
1 stop22h 56m
Multiple Airlines
Mon 8/1010:54 pm
IDA
-
ONT
1 stop10h 09m
Multiple Airlines
Deal found 7/22$258
This Kiwi.com deal was found by Cheapflights users on 7/22. 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.
Wed 9/23:13 pm
ONT
-
GEG
2 stops18h 06m
Multiple Airlines
Thu 9/1010:09 am
GEG
-
ONT
1 stop6h 01m
Multiple Airlines
Deal found 7/22$306

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 July 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(Alaska Airlines)

One-way from

$94
(Southwest)

Popular in

July

Cheapest in

April

Average price

$387

Good round-trip deal

$197 or less

Good one-way deal

$173 or less
Provider with most accurate pricing for Los Angeles-Boise Air Term. Gowen Fld flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Boise Air Term. Gowen Fld flights.
Search Deals
From Ontario to Idaho
Search Deals
One-way flight from Ontario to Idaho
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($40 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 July 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Idaho.
Search Deals
Price to beat on a one-way flight from Ontario to Idaho.
Search Deals

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 July 23, 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

Price

Cheapest round-trip

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Tue 9/22

8:35 am-1:40 pm

1 stop4h 05m

Boise Air Term. Gowen Fld

Sat 9/26

6:10 am-11:15 am

1 stop6h 05m

$187

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 10/17

7:35 am-3:25 pm

1 stop6h 50m

Boise Air Term. Gowen Fld

Tue 10/20

6:35 am-12:00 pm

2 stops6h 25m

$192

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 10/17

6:02 am-3:23 pm

1 stop8h 21m

Boise Air Term. Gowen Fld

Tue 10/20

2:51 pm-4:02 pm

Nonstop2h 11m

$197

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 9/4

4:50 pm-11:55 pm

1 stop6h 05m

Boise Air Term. Gowen Fld

Sat 9/5

11:35 am-2:15 pm

1 stop3h 40m

$197

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 8/22

5:40 am-1:45 pm

2 stops7h 05m

Boise Air Term. Gowen Fld

Tue 8/25

3:30 pm-8:55 pm

2 stops6h 25m

$197

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Thu 8/27

4:50 pm-11:55 pm

1 stop6h 05m

Boise Air Term. Gowen Fld

Mon 8/31

7:30 am-1:25 pm

1 stop6h 55m

$207

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 10/23

6:55 pm-1:40 am

1 stop5h 45m

Boise Air Term. Gowen Fld

Mon 10/26

6:50 am-11:15 am

1 stop5h 25m

$207

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 8/29

7:12 am-1:21 pm

1 stop5h 09m

Boise Air Term. Gowen Fld

Tue 9/1

4:28 pm-8:24 pm

1 stop4h 56m

$217

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 10/16

11:00 am-4:05 pm

1 stop4h 05m

Boise Air Term. Gowen Fld

Mon 10/19

6:50 am-11:15 am

1 stop5h 25m

$217
Quickest round-trip

OntarioTwin Falls

ONT - TWF

ONTTWF

Ontario

Wed 8/19

6:00 am-10:47 am

1 stop3h 47m

Twin Falls Joslin

Wed 8/26

6:16 am-8:52 am

1 stop3h 36m

$312

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/22

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

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.
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

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 $177). Flying from Ontario to Idaho in November is currently the most expensive (average of $413). 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 July 23, 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 July 23, 2026.

The most flights from ONT to USID are scheduled on a Tuesday (2 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?

Airfare is below average for this route at the moment.
Ontario to Idaho flights typically cost between $257 and $368 in August.
The cheapest round-trip price found within the last 5 days was $177 on Alaska Airlines (Aug 29-Sep 1).

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 42 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.

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 July 23, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, 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.
Southwest
8.0
Very good
4,236 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Southwest
8.0
Very good
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Alaska Airlines
7.9
Good
12,704 reviews
Southwest
8.0
Very good
4,236 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Delta
7.8
Good
8,482 reviews
Southwest
8.0
Very good
4,236 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

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.

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

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

  • How popular is this Ontario to Idaho flight route?

    The Ontario to Idaho flight path was viewed by 2 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Ontario to Idaho?

    Airlines like Southwest, Alaska Airlines, and Delta fly from Ontario to Idaho in about 3h 47m. The time it takes to get you to your destination can typically vary by up to 4h 34m. There are 606 mi between Ontario and Idaho. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from Ontario to Idaho are Frontier ($70), Delta ($108), and United Airlines ($108).

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

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

  • What are the cheapest flights from Ontario to Idaho?

    Looking at all options, your cheapest flight can be booked for $173. While the most popular route (Ontario - Boise Air Term. Gowen Fld) can be booked for $197 on average, our data indicates $282 when flying from Ontario to Idaho.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Idaho 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 Ontario to Idaho?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Idaho (average of $177). Flying from Ontario to Idaho in November is currently the most expensive (average of $413). 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 Ontario to Idaho

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

Top 3 airlines flying from Ontario to Idaho

Discover the top 3 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 July 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$137Average$285FlexibilityNo cancel feeOn-time75%
DeltaCheapest$169Average$334FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$176Average$356FlexibilityNo 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.