Idaho

$70+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOI
Apr 28 — May 51
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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 March 29, 2026.

This Expedia deal was found by Cheapflights users on 3/28. 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.
Sat 4/1812:59 am
ONT
-
GEG
1 stop9h 50m
Frontier
Sun 4/2611:44 am
GEG
-
ONT
1 stop19h 47m
Frontier
Deal found 3/28$140
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
ONT
-
BOI
1 stop5h 27m
Frontier
Tue 5/191:22 pm
BOI
-
ONT
1 stop11h 27m
Frontier
Deal found 3/26$140
This CheapOair deal was found by Cheapflights users on 3/28. 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 CheapOair 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 stop19h 47m
Frontier
Deal found 3/28$151
This CheapOair deal was found by Cheapflights users on 3/25. 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.
Wed 4/1512:59 am
ONT
-
BOI
1 stop9h 09m
Frontier
Sun 4/1911:53 am
BOI
-
ONT
1 stop20h 38m
Frontier
Deal found 3/25$151
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
Sat 4/186:25 pm
ONT
-
BOI
Nonstop2h 01m
Alaska Airlines
Sat 4/251:15 pm
BOI
-
ONT
Nonstop2h 04m
Alaska Airlines
Deal found 3/27$157
This Expedia deal was found by Cheapflights users on 3/24. 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
Thu 4/3011:44 am
GEG
-
ONT
1 stop19h 47m
Frontier
Deal found 3/24$160
This Expedia deal was found by Cheapflights users on 3/27. 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 4/1512:59 am
ONT
-
GEG
1 stop9h 50m
Frontier
Sun 4/1911:44 am
GEG
-
ONT
1 stop19h 47m
Frontier
Deal found 3/27$161
This Southwest deal was found by Cheapflights users on 3/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/185:30 am
ONT
-
BOI
1 stop6h 50m
Southwest
Sat 4/252:50 pm
BOI
-
ONT
1 stop7h 30m
Southwest
Deal found 3/27$177
This Expedia deal was found by Cheapflights users on 3/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1210:50 am
ONT
-
GEG
1 stop24h 48m
Frontier
Fri 5/1512:33 pm
GEG
-
ONT
1 stop11h 16m
Frontier
Deal found 3/26$181
This Expedia deal was found by Cheapflights users on 3/28. 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.
Tue 5/196:00 am
ONT
-
BOI
1 stop5h 27m
Frontier
Sun 5/241:25 pm
BOI
-
ONT
1 stop21h 40m
Frontier
Deal found 3/28$185
This Southwest deal was found by Cheapflights users on 3/24. 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 5/29:30 am
ONT
-
BOI
1 stop5h 45m
Southwest
Sat 5/92:50 pm
BOI
-
ONT
1 stop7h 30m
Southwest
Deal found 3/24$187
This Expedia deal was found by Cheapflights users on 3/28. 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.
Tue 5/56:00 am
ONT
-
BOI
1 stop5h 27m
Multiple Airlines
Sat 5/91:15 pm
BOI
-
ONT
Nonstop2h 04m
Multiple Airlines
Deal found 3/28$189

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 March 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Expedia)

One-way from

$70
(Priceline)

Popular in

February

Cheapest in

April

Average price

$367

Good round-trip deal

$257 or less

Good one-way deal

$308 or less
Provider with most accurate pricing for Los Angeles-Boise Air Term. Gowen Fld flight deals.
Provider most trusted by Cheapflights users for Los Angeles-Boise Air Term. Gowen Fld flights.
From Ontario to Idaho
One-way flight from Ontario to Idaho
Highest demand for flights based on searches. 10% potential increase in price ($34 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Average for round-trip flights in March 2026
Price to beat on a round-trip flight from Ontario to Idaho.
Price to beat on a one-way flight from Ontario to Idaho.

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 March 29, 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

Sat 4/18

5:30 am-1:20 pm

1 stop6h 50m

Boise Air Term. Gowen Fld

Sat 4/25

2:50 pm-9:20 pm

1 stop7h 30m

$177

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Tue 4/14

3:45 pm-12:25 am

2 stops7h 40m

Boise Air Term. Gowen Fld

Sat 4/18

3:25 pm-8:45 pm

2 stops6h 20m

$239

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Fri 6/5

4:40 pm-12:15 am

2 stops6h 35m

Boise Air Term. Gowen Fld

Mon 6/8

6:00 am-11:20 am

2 stops6h 20m

$263

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Tue 4/28

6:00 am-10:38 am

1 stop4h 38m

Spokane

Sat 5/2

5:00 am-9:45 am

1 stop4h 45m

$271

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Fri 5/1

5:05 pm-11:34 pm

1 stop6h 29m

Spokane

Tue 5/5

5:30 am-12:14 pm

1 stop6h 44m

$283

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Tue 4/28

6:00 am-1:52 pm

1 stop6h 52m

Boise Air Term. Gowen Fld

Wed 4/29

6:08 pm-10:32 pm

1 stop5h 24m

$287

OntarioSpokane

ONT - GEG

ONTGEG

Ontario

Tue 5/12

4:30 pm-10:45 pm

2 stops6h 15m

Spokane

Fri 5/15

5:35 pm-11:05 pm

1 stop5h 30m

$289

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sat 5/2

5:30 am-2:10 pm

2 stops7h 40m

Boise Air Term. Gowen Fld

Sat 5/9

8:50 am-12:15 pm

1 stop4h 25m

$292

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Sun 8/2

5:16 pm-12:05 am

1 stop5h 49m

Boise Air Term. Gowen Fld

Sat 8/15

11:35 am-4:14 pm

1 stop5h 39m

$297

OntarioBoise

ONT - BOI

ONTBOI

Ontario

Mon 4/27

6:00 am-11:06 am

1 stop4h 06m

Boise Air Term. Gowen Fld

Thu 5/7

6:23 am-12:22 pm

1 stop6h 59m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/28

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, 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 March 29, 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 64% 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 March 29, 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?

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 March 29, 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.

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 Frontier, Southwest, and Alaska Airlines fly from Ontario to Idaho in about 6h 50m. The time it takes to get you to your destination can typically vary by up to 3h. 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?

  • 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 - Boise Air Term. Gowen Fld) can be booked for $179 on average, our data indicates $298 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

Browse thousands of different options on Cheapflights for your next trip

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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.

Top 4 airlines flying from Ontario to Idaho

Discover the top 4 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 March 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$137Average$247FlexibilityNo cancel feeOn-time75%
DeltaCheapest$153Average$358FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$190Average$355FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$196Average$315FlexibilityNo cancel feeOn-time69%

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