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$105+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
May 6 — May 131
Tue 5/6
Tue 5/13
1 adult, Economy
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Cheap flight deals from Ontario to Idaho

Keep the following information in mind while searching for Ontario to Idaho flight deals. Data was last updated May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$213
(Alaska Airlines)

One-way from

$105
(Frontier)

Popular in

December

Cheapest in

October

Average price

$277
Provider with most accurate pricing for Los Angeles-Boise Air Term. Gowen Fld flight deals.
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From Ontario to Idaho
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One-way flight from Ontario to Idaho
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Highest demand for flights based on searches. 13% potential increase in price ($44 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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Find 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 May 1, 2025.

This Alaska Airlines deal was found by Cheapflights users on 4/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/106:00 amONT - BOI
1 stop7h 05mAlaska Airlines
Tue 6/105:39 pmBOI - ONT
1 stop6h 07mAlaska Airlines
Deal found 4/30$213
This Hawaiian Airlines deal was found by Cheapflights users on 4/29. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/44:45 pmONT - BOI
1 stop4h 57mHawaiian Airlines
Wed 6/116:37 amBOI - ONT
1 stop5h 20mHawaiian Airlines
Deal found 4/29$218
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/206:00 amONT - BOI
1 stop6h 10mDelta
Tue 5/275:40 pmBOI - ONT
1 stop7h 02mDelta
Deal found 4/29$219
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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.
Mon 5/56:24 pmONT - GEG
1 stop4h 40mAlaska Airlines
Tue 5/136:00 amGEG - ONT
1 stop4h 51mAlaska Airlines
Deal found 4/28$220
This Hawaiian Airlines deal was found by Cheapflights users on 4/29. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/204:45 pmONT - GEG
1 stop5h 40mHawaiian Airlines
Thu 5/221:40 pmGEG - ONT
1 stop4h 45mHawaiian Airlines
Deal found 4/29$229
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2710:01 amONT - WYS
1 stop3h 36mDelta
Mon 6/212:53 pmWYS - ONT
2 stops10h 42mDelta
Deal found 4/29$242
This Gotogate deal was found by Cheapflights users on 4/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/265:21 pmONT - GEG
1 stop17h 43mFrontier
Thu 5/2911:49 amGEG - ONT
1 stop12h 02mFrontier
Deal found 4/30$246
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/101:15 pmONT - GEG
1 stop5h 00mDelta
Tue 7/155:35 pmGEG - ONT
1 stop5h 12mDelta
Deal found 4/28$249
This Frontier deal was found by Cheapflights users on 4/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1712:59 amONT - BOI
1 stop11h 38mFrontier
Sun 6/112:36 pmBOI - ONT
1 stop12h 14mFrontier
Deal found 4/30$258
This United Airlines deal was found by Cheapflights users on 4/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/126:48 pmONT - GEG
1 stop4h 50mUnited Airlines
Fri 5/163:25 pmGEG - ONT
1 stop5h 09mUnited Airlines
Deal found 4/29$261
This Southwest deal was found by Cheapflights users on 4/29. 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.
Fri 6/138:05 pmONT - GEG
1 stop4h 25mSouthwest
Wed 6/1811:05 amGEG - ONT
1 stop6h 25mSouthwest
Deal found 4/29$269
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/224:45 pmONT - BOI
1 stop6h 00mMultiple Airlines
Sun 5/2512:36 pmBOI - ONT
1 stop12h 15mMultiple Airlines
Deal found 4/29$283

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 May 1, 2025.
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

Tue 6/10

6:00 am-2:05 pm

1 stop7h 05m

Boise Air Term. Gowen Fld

Tue 6/10

5:39 pm-10:46 pm

1 stop6h 07m

$213

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Wed 6/4

4:45 pm-10:42 pm

1 stop4h 57m

Boise Air Term. Gowen Fld

Wed 6/11

6:37 am-10:57 am

1 stop5h 20m

$218

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Tue 5/20

6:00 am-1:10 pm

1 stop6h 10m

Boise Air Term. Gowen Fld

Tue 5/27

5:40 pm-11:42 pm

1 stop7h 02m

$219

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Wed 5/28

7:20 pm-11:54 pm

1 stop4h 34m

Spokane

Sat 5/31

6:00 am-10:57 am

1 stop4h 57m

$220

OntarioWest Yellowstone

ONT - WYS

ONTWYS

Ontario

Tue 5/27

10:01 am-2:37 pm

1 stop3h 36m

West Yellowstone

Mon 6/2

12:53 pm-10:35 pm

2 stops10h 42m

$242

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Fri 5/30

7:20 pm-11:54 pm

1 stop4h 34m

Spokane

Sun 6/1

6:00 am-10:57 am

1 stop4h 57m

$244

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Mon 5/26

5:21 pm-11:04 am

1 stop17h 43m

Spokane

Thu 5/29

11:49 am-11:51 pm

1 stop12h 02m

$246

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Tue 6/10

1:15 pm-6:15 pm

1 stop5h 00m

Spokane

Tue 7/15

5:35 pm-10:47 pm

1 stop5h 12m

$249

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 5/17

12:59 am-1:37 pm

1 stop11h 38m

Boise Air Term. Gowen Fld

Sun 6/1

12:36 pm-11:50 pm

1 stop12h 14m

$258

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Mon 5/12

6:48 pm-11:38 pm

1 stop4h 50m

Spokane

Fri 5/16

3:25 pm-8:34 pm

1 stop5h 09m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 58 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, October is the cheapest month in which you can book a flight from Ontario to Idaho (average of $314). Flying from Ontario to Idaho in June is currently the most expensive (average of $406). 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 May 1, 2025.

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.

Rainfall in Idaho by month

Plan your trip to Idaho by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Idaho ranges from 0.2 - 1.6 inches per month. December is typically the wettest month, when rainfall can reach 1.6 in. August is typically the driest time to visit Idaho when rainfall is around 0.2 in.

Temperature in Idaho by month

Plan your trip to Idaho by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Idaho, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 30.2 F).

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 May 1, 2025.
Read through reviews of airlines operating flights from Ontario to Idaho, such as Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,294 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,409 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Overall

8.0

Comfort

7.9

Boarding

8.2

Food

7.1

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 ($105), Alaska Airlines ($109), and Hawaiian Airlines ($110).

  • 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.

  • 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, October is the cheapest month in which you can book a flight from Ontario to Idaho (average of $314). Flying from Ontario to Idaho in June is currently the most expensive (average of $406). 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$121Average$163FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$177Average$298FlexibilityNo cancel feeOn-time75%
DeltaCheapest$206Average$435FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$233Average$377FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$240Average$344FlexibilityNo cancel feeOn-time63%

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