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$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 8/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Sep 2 — Sep 91
Wed 9/2
Wed 9/9
1 adult, Economy
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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 August 3, 2026.

This Alaska Airlines deal was found by Cheapflights users on 8/1. 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 9/164:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Tue 9/223:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Deal found 8/1$177
This SmartFares deal was found by Cheapflights users on 7/31. 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 SmartFares 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
Sun 8/306:00 am
BOI
-
ONT
1 stop4h 51m
Alaska Airlines
Deal found 7/31$182
This Alaska Airlines deal was found by Cheapflights users on 8/1. 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 9/184:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Tue 9/223:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Deal found 8/1$187
This Southwest deal was found by Cheapflights users on 7/29. 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 9/88:35 am
ONT
-
BOI
1 stop4h 05m
Southwest
Tue 9/153:30 pm
BOI
-
ONT
2 stops6h 30m
Southwest
Deal found 7/29$192
This Traveloka deal was found by Cheapflights users on 8/2. 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 Traveloka is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/164:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Wed 9/231:31 pm
BOI
-
ONT
1 stop4h 47m
Alaska Airlines
Deal found 8/2$193
This Traveloka deal was found by Cheapflights users on 7/31. 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 Traveloka is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:02 am
ONT
-
BOI
1 stop5h 34m
Alaska Airlines
Sat 9/54:28 pm
BOI
-
ONT
1 stop4h 56m
Alaska Airlines
Deal found 7/31$195
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 9/1612:12 pm
ONT
-
BOI
1 stop7h 23m
Alaska Airlines
Sat 9/193:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Deal found 7/29$197
This Delta deal was found by Cheapflights users on 7/30. 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 8/291:06 pm
ONT
-
BOI
1 stop4h 54m
Delta
Sun 8/306:00 am
BOI
-
ONT
1 stop3h 52m
Delta
Deal found 7/30$198
This Southwest deal was found by Cheapflights users on 7/31. 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 9/22:10 pm
ONT
-
BOI
2 stops7h 05m
Southwest
Sat 9/53:10 pm
BOI
-
ONT
1 stop5h 55m
Southwest
Deal found 7/31$202
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 9/162:30 pm
ONT
-
GEG
1 stop18h 49m
Multiple Airlines
Sun 9/2710:09 am
GEG
-
ONT
1 stop20h 55m
Multiple Airlines
Deal found 7/31$247
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 9/92:30 pm
ONT
-
GEG
1 stop18h 49m
Multiple Airlines
Sun 9/1310:09 am
GEG
-
ONT
1 stop20h 55m
Multiple Airlines
Deal found 7/30$250
This Kiwi.com deal was found by Cheapflights users on 7/31. 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
1 stop20h 16m
Multiple Airlines
Deal found 7/31$252

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 August 3, 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

$309

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 August 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 August 3, 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

Wed 10/28

4:42 pm-7:43 pm

Nonstop2h 01m

Boise Air Term. Gowen Fld

Sat 10/31

5:59 am-10:49 am

1 stop5h 50m

$197

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Wed 9/16

12:12 pm-8:35 pm

1 stop7h 23m

Boise Air Term. Gowen Fld

Sat 9/19

3:02 pm-4:10 pm

Nonstop2h 08m

$197

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Thu 9/17

6:00 am-1:15 pm

1 stop6h 15m

Boise Air Term. Gowen Fld

Sun 9/20

6:30 am-9:30 am

1 stop4h 00m

$207
Quickest round-trip

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 9/25

4:50 pm-7:45 pm

Nonstop1h 55m

Boise Air Term. Gowen Fld

Sun 9/27

6:00 am-9:51 am

1 stop4h 51m

$207

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Mon 8/31

5:40 am-1:15 pm

2 stops6h 35m

Boise Air Term. Gowen Fld

Sun 9/6

7:35 am-10:10 am

1 stop3h 35m

$222

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 10/17

11:29 am-5:07 pm

1 stop4h 38m

Boise Air Term. Gowen Fld

Tue 10/20

2:51 pm-4:02 pm

Nonstop2h 11m

$237

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Sun 8/16

6:08 am-10:30 am

1 stop4h 22m

Spokane

Wed 8/19

5:00 am-12:50 pm

1 stop7h 50m

$257

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Wed 9/9

3:35 pm-10:30 pm

2 stops5h 55m

Boise Air Term. Gowen Fld

Mon 9/14

7:00 am-10:20 am

1 stop4h 20m

$257

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Thu 8/20

4:10 pm-11:15 pm

2 stops7h 05m

Spokane

Sat 8/22

5:45 am-9:50 am

1 stop4h 05m

$262

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Mon 8/24

6:01 pm-11:59 pm

1 stop5h 58m

Spokane

Thu 8/27

11:09 am-5:21 pm

1 stop6h 12m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 60 resultsSorted by cheapest first
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2
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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 December is currently the most expensive (average of $411). 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 August 3, 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 August 3, 2026.

The most flights from ONT to USID 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 Ontario to Idaho?

Airfare is below average for this route at the moment.
Ontario to Idaho flights typically cost between $217 and $320 in September.
The cheapest round-trip price found within the last 5 days was $177 on Alaska Airlines (Sep 16-Sep 22).

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 August 3, 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
4,227 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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
4,227 reviews
Southwest
8.0
Very good
4,227 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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
12,756 reviews
Southwest
8.0
Very good
4,227 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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
8,486 reviews
Southwest
8.0
Very good
4,227 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

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 3 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 Alaska Airlines, Southwest, and United Airlines fly from Ontario to Idaho in about 2h 01m. The time it takes to get you to your destination can typically vary by up to 4h 14m. There are 661 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 $138. While the most popular route (Ontario - Boise Air Term. Gowen Fld) can be booked for $197 on average, our data indicates $258 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 December is currently the most expensive (average of $411). 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.

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Alternative routes for Ontario to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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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 August 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$137Average$286FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$176Average$356FlexibilityNo cancel feeOn-time63%
DeltaCheapest$180Average$343FlexibilityNo cancel feeOn-timeN/A

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