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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 4/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Mar 23 — Mar 301
Mon 3/23
Mon 3/30
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 February 21, 2026.

This Alaska Airlines deal was found by Cheapflights users on 2/18. 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.
Sat 4/116:25 pm
ONT
-
BOI
Nonstop2h 01m
Alaska Airlines
Sat 4/184:40 pm
BOI
-
ONT
Nonstop2h 05m
Alaska Airlines
Deal found 2/18$117
This Delta deal was found by Cheapflights users on 2/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:00 am
ONT
-
BOI
1 stop6h 05m
Delta
Sat 3/216:15 pm
BOI
-
ONT
1 stop5h 33m
Delta
Deal found 2/18$137
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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.
Sat 3/147:37 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Mon 3/234:40 pm
BOI
-
ONT
Nonstop2h 05m
Alaska Airlines
Deal found 2/18$147
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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.
Wed 4/296:00 am
ONT
-
BOI
1 stop16h 59m
Alaska Airlines
Wed 5/61:15 pm
BOI
-
ONT
Nonstop2h 04m
Alaska Airlines
Deal found 2/18$151
This CheapOair deal was found by Cheapflights users on 2/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:37 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Fri 3/204:40 pm
BOI
-
ONT
Nonstop2h 05m
Alaska Airlines
Deal found 2/17$157
This Expedia deal was found by Cheapflights users on 2/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:59 am
ONT
-
GEG
1 stop9h 50m
Frontier
Sun 4/2611:44 am
GEG
-
ONT
1 stop12h 11m
Frontier
Deal found 2/20$160
This Delta deal was found by Cheapflights users on 2/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:00 am
ONT
-
BOI
1 stop6h 05m
Delta
Mon 3/2310:35 am
BOI
-
ONT
1 stop12h 59m
Delta
Deal found 2/18$160
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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 4/232:59 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Sat 4/251:15 pm
BOI
-
ONT
Nonstop2h 04m
Alaska Airlines
Deal found 2/18$167
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:15 am
ONT
-
GEG
1 stop28h 32m
Multiple Airlines
Sun 3/299:21 pm
GEG
-
ONT
1 stop10h 45m
Multiple Airlines
Deal found 2/20$171
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/86:00 am
ONT
-
BOI
1 stop12h 48m
Alaska Airlines
Sat 4/114:40 pm
BOI
-
ONT
Nonstop2h 05m
Alaska Airlines
Deal found 2/20$171
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:05 pm
ONT
-
BOI
1 stop3h 51m
Delta
Sat 5/166:41 pm
BOI
-
ONT
1 stop5h 04m
Delta
Deal found 2/20$172
This Alaska Airlines deal was found by Cheapflights users on 2/18. 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.
Sun 3/157:37 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Mon 3/234:40 pm
BOI
-
ONT
Nonstop2h 05m
Alaska Airlines
Deal found 2/18$177

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 February 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$117
(Alaska Airlines)

One-way from

$76
(Delta)

Popular in

February

Cheapest in

April

Average price

$349

Good round-trip deal

$177 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. 2% potential increase in price ($7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip 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 February 21, 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

Sat 3/14

7:37 pm-10:36 pm

Nonstop1h 59m

Boise Air Term. Gowen Fld

Sat 3/21

4:40 pm-5:45 pm

Nonstop2h 05m

$137

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sun 3/15

7:37 pm-10:36 pm

Nonstop1h 59m

Boise Air Term. Gowen Fld

Sat 3/21

4:40 pm-5:45 pm

Nonstop2h 05m

$167

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Thu 4/23

2:59 pm-5:59 pm

Nonstop2h 00m

Boise Air Term. Gowen Fld

Sat 4/25

1:15 pm-2:19 pm

Nonstop2h 04m

$167

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 5/1

3:26 pm-3:33 pm

1 stop23h 07m

Boise Air Term. Gowen Fld

Sat 5/16

4:14 pm-5:17 pm

Nonstop2h 03m

$171

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 5/1

5:05 pm-11:57 pm

1 stop5h 52m

Boise Air Term. Gowen Fld

Sat 5/16

6:00 am-12:53 pm

1 stop7h 53m

$172

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 3/13

7:37 pm-10:36 pm

Nonstop1h 59m

Boise Air Term. Gowen Fld

Mon 3/23

4:40 pm-5:45 pm

Nonstop2h 05m

$177

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 4/25

2:59 pm-5:59 pm

Nonstop2h 00m

Boise Air Term. Gowen Fld

Tue 4/28

1:15 pm-2:19 pm

Nonstop2h 04m

$177

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 4/11

6:25 pm-9:26 pm

Nonstop2h 01m

Boise Air Term. Gowen Fld

Sat 4/18

6:04 pm-9:39 am

1 stop16h 35m

$180

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Fri 5/8

5:50 pm-11:56 pm

1 stop6h 06m

Spokane

Sun 5/10

6:10 am-11:12 am

1 stop5h 02m

$183

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Sat 5/9

1:35 pm-9:13 pm

1 stop7h 38m

Spokane

Tue 5/12

5:05 am-11:12 am

1 stop6h 07m

$183

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/18

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 February 21, 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.

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 February 21, 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).

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 February 21, 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
11,918 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

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
11,918 reviews
Alaska Airlines
8.0
Very good
11,918 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

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
4,298 reviews
Alaska Airlines
8.0
Very good
11,918 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

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
8,228 reviews
Alaska Airlines
8.0
Very good
11,918 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

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
9,335 reviews
Alaska Airlines
8.0
Very good
11,918 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

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
11,334 reviews
Alaska Airlines
8.0
Very good
11,918 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Boarding

8.1

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 09m. 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 Delta ($88), United Airlines ($98), and Alaska Airlines ($108).

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

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

  • What are the cheapest flights from Ontario to Idaho?

    Looking at all options, your cheapest flight can be booked for $137. While the most popular route (Ontario - Spokane) can be booked for $171 on average, our data indicates $217 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 February 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$137Average$244FlexibilityNo cancel feeOn-time75%
DeltaCheapest$158Average$353FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$196Average$315FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$220Average$349FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$516FlexibilityNo cancel feeOn-time71%

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