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$76+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 2/257:59 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Sat 2/285:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Deal found 1/27$137
This CheapOair deal was found by Cheapflights users on 1/27. 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.
Tue 2/247:59 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Tue 3/36:07 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Deal found 1/27$147
This Expedia deal was found by Cheapflights users on 1/28. 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.
Thu 2/192:08 pm
ONT
-
BOI
1 stop20h 03m
Frontier
Thu 2/2612:38 pm
BOI
-
ONT
1 stop12h 21m
Frontier
Deal found 1/28$148
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 2/197:37 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Sat 2/215:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Deal found 1/27$157
This Expedia deal was found by Cheapflights users on 1/27. 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 2/258:40 am
ONT
-
BOI
1 stop26h 11m
Multiple Airlines
Sat 2/286:00 pm
BOI
-
ONT
1 stop6h 32m
Multiple Airlines
Deal found 1/27$158
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 5/12:59 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Sat 5/164:36 pm
BOI
-
ONT
Nonstop2h 03m
Alaska Airlines
Deal found 1/28$167
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 2/256:14 am
ONT
-
BOI
1 stop7h 44m
Alaska Airlines
Wed 2/256:00 pm
BOI
-
ONT
1 stop5h 44m
Alaska Airlines
Deal found 1/27$171
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/262:08 pm
ONT
-
BOI
1 stop20h 03m
Frontier
Thu 3/1212:15 pm
BOI
-
ONT
1 stop12h 44m
Frontier
Deal found 1/29$175
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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.
Fri 2/277:37 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Mon 3/25:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Deal found 1/29$177
This Delta deal was found by Cheapflights users on 1/26. 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.
Mon 3/165:53 pm
ONT
-
BOI
1 stop4h 52m
Delta
Mon 3/2310:35 am
BOI
-
ONT
1 stop7h 38m
Delta
Deal found 1/26$187
This Delta deal was found by Cheapflights users on 1/26. 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.
Wed 4/85:53 pm
ONT
-
GEG
1 stop4h 57m
Delta
Tue 4/145:10 pm
GEG
-
ONT
1 stop6h 34m
Delta
Deal found 1/26$197
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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.
Mon 5/112:59 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Tue 5/196:35 am
BOI
-
ONT
1 stop5h 32m
Alaska Airlines
Deal found 1/27$197

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$137
(Alaska Airlines)

One-way from

$76
(CheapOair)

Popular in

December

Cheapest in

April

Average price

$272

Good round-trip deal

$157 or less

Good one-way deal

$108 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. 4% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 29, 2026.
Use the filters below to find and compare flights from Ontario to Idaho that are best for you.

Fly from

Ontario

Fly to

Idaho

Route

Depart

Return

Price

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 2/27

7:37 pm-10:36 pm

Nonstop1h 59m

Boise Air Term. Gowen Fld

Mon 3/2

5:50 pm-6:57 pm

Nonstop2h 07m

$177

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Thu 4/16

6:25 pm-9:26 pm

Nonstop2h 01m

Boise Air Term. Gowen Fld

Mon 4/20

4:40 pm-5:45 pm

Nonstop2h 05m

$177

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Wed 2/25

6:14 am-2:58 pm

1 stop7h 44m

Boise Air Term. Gowen Fld

Sat 2/28

5:50 pm-6:57 pm

Nonstop2h 07m

$177

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Mon 3/16

5:53 pm-11:45 pm

1 stop4h 52m

Boise Air Term. Gowen Fld

Mon 3/23

10:35 am-5:13 pm

1 stop7h 38m

$187

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Wed 4/8

5:53 pm-10:50 pm

1 stop4h 57m

Spokane

Tue 4/14

5:10 pm-11:44 pm

1 stop6h 34m

$197

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Wed 4/22

5:55 pm-12:20 am

1 stop6h 25m

Spokane

Sat 4/25

5:00 am-11:13 am

1 stop6h 13m

$197

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Wed 4/8

5:53 pm-12:03 am

1 stop6h 10m

Spokane

Wed 4/15

5:00 am-11:13 am

1 stop6h 13m

$197

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Wed 4/15

7:08 pm-11:59 pm

1 stop4h 51m

Spokane

Sat 4/18

3:32 pm-8:23 pm

1 stop4h 51m

$197

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 2/20

7:37 pm-10:36 pm

Nonstop1h 59m

Boise Air Term. Gowen Fld

Mon 2/23

8:20 pm-11:52 pm

1 stop4h 32m

$207

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Wed 4/15

6:00 am-12:22 pm

1 stop5h 22m

Boise Air Term. Gowen Fld

Wed 4/22

6:08 pm-10:32 pm

1 stop5h 24m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 60 results
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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, November is the cheapest month in which you can book a flight from Ontario to Idaho (average of $60). Flying from Ontario to Idaho in December is currently the most expensive (average of $159). 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 January 29, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Idaho as you normally would.

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 January 29, 2026.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
11,806 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Alaska Airlines
8.0
Very good
11,806 reviews
Alaska Airlines
8.0
Very good
11,806 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Southwest
8.0
Very good
4,267 reviews
Alaska Airlines
8.0
Very good
11,806 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Delta
7.9
Good
8,128 reviews
Alaska Airlines
8.0
Very good
11,806 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
United Airlines
7.4
Good
9,215 reviews
Alaska Airlines
8.0
Very good
11,806 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
American Airlines
7.2
Good
11,205 reviews
Alaska Airlines
8.0
Very good
11,806 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading

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 long is the flight from Ontario to Idaho?

    Airlines like Alaska Airlines, Delta, and United Airlines fly from Ontario to Idaho in about 1h 59m. The time it takes to get you to your destination can typically vary by up to 5h 12m. 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 Alaska Airlines ($69), Delta ($88), and United Airlines ($98).

  • 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 most reliable airlines from Ontario to Idaho?

    No one likes to see their flight delayed. When booking a flight from Ontario to Idaho consider choosing Sun Country Air (100%), Alaska Airlines (63%) or Horizon Air (63%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Ontario to Idaho?

    Looking at all options, your cheapest flight can be booked for $97. While the most popular route (Ontario - Boise Air Term. Gowen Fld) can be booked for $137 on average, our data indicates $163 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, November is the cheapest month in which you can book a flight from Ontario to Idaho (average of $60). Flying from Ontario to Idaho in December is currently the most expensive (average of $159). 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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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 5 airlines flying from Ontario to Idaho

Discover the top 5 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$137Average$244FlexibilityNo cancel feeOn-time75%
DeltaCheapest$158Average$358FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$196Average$315FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$220Average$345FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$516FlexibilityNo cancel feeOn-time71%

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