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$76+ Cheap flights from Idaho to Ontario (ONT)

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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Apr 25 — May 21
Sat 4/25
Sat 5/2
1 adult, Economy
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Cheap flight deals from Idaho to Ontario

Cheapest flights from Idaho to Ontario
Explore the most affordable flight options available from Idaho to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2026.

This Expedia deal was found by Cheapflights users on 3/23. 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 5/71:22 pm
BOI
-
ONT
1 stop21h 43m
Frontier
Sat 5/910:50 am
ONT
-
BOI
1 stop24h 37m
Frontier
Deal found 3/23$140
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.
Fri 5/812:33 pm
GEG
-
ONT
1 stop21h 32m
Frontier
Mon 5/116:00 am
ONT
-
GEG
1 stop5h 38m
Frontier
Deal found 3/24$140
This Frontier deal was found by Cheapflights users on 3/23. 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.
Tue 5/51:22 pm
BOI
-
ONT
1 stop11h 27m
Frontier
Tue 5/126:00 am
ONT
-
BOI
1 stop5h 27m
Frontier
Deal found 3/23$142
This Frontier deal was found by Cheapflights users on 3/23. 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.
Thu 5/71:22 pm
BOI
-
ONT
1 stop11h 27m
Frontier
Sun 5/106:00 am
ONT
-
BOI
1 stop5h 27m
Frontier
Deal found 3/23$160
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/191:22 pm
BOI
-
ONT
1 stop11h 27m
Frontier
Sun 5/246:00 am
ONT
-
BOI
1 stop5h 30m
Frontier
Deal found 3/24$165
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:53 am
BOI
-
ONT
1 stop20h 38m
Frontier
Sat 4/1812:59 am
ONT
-
BOI
1 stop9h 09m
Frontier
Deal found 3/26$171
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2311:44 am
GEG
-
ONT
1 stop19h 47m
Frontier
Wed 4/2912:59 am
ONT
-
GEG
1 stop9h 50m
Frontier
Deal found 3/24$171
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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 4/154:40 pm
BOI
-
ONT
Nonstop2h 05m
Alaska Airlines
Wed 4/222:59 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Deal found 3/23$177
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.
Tue 4/213:15 pm
BOI
-
ONT
1 stop7h 35m
Southwest
Tue 4/283:45 pm
ONT
-
BOI
1 stop6h 35m
Southwest
Deal found 3/24$187
This CheapOair deal was found by Cheapflights users on 3/23. 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.
Sun 5/171:22 pm
BOI
-
ONT
1 stop21h 43m
Frontier
Wed 5/2010:50 am
ONT
-
BOI
1 stop24h 40m
Frontier
Deal found 3/23$191
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/22:00 pm
BOI
-
ONT
1 stop6h 35m
Southwest
Tue 6/94:35 pm
ONT
-
BOI
2 stops6h 50m
Southwest
Deal found 3/26$202
This Expedia deal was found by Cheapflights users on 3/22. 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.
Fri 4/174:40 pm
BOI
-
ONT
Nonstop2h 05m
Multiple Airlines
Sat 4/1812:59 am
ONT
-
BOI
1 stop9h 09m
Multiple Airlines
Deal found 3/22$204

Find flight deals from Idaho to Ontario

Keep the following information in mind while searching for Idaho to Ontario flight deals. Data was last updated March 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Frontier)

One-way from

$76
(Frontier)

Popular in

March

Cheapest in

April

Average price

$363

Good round-trip deal

$197 or less

Good one-way deal

$178 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Los Angeles flights.
Search Deals
From Idaho to Ontario
Search Deals
One-way flight from Idaho to Ontario
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Idaho to Ontario.
Search Deals
Price to beat on a one-way flight from Idaho to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho to Ontario 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 26, 2026.
Use the filters below to find and compare flights from Idaho to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 4/28

6:40 am-10:05 am

1 stop4h 25m

Ontario

Mon 5/4

6:00 pm-1:00 am

1 stop6h 00m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 4/23

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Sun 5/3

2:59 pm-5:59 pm

Nonstop2h 00m

$217

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 5/5

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Wed 5/6

3:24 pm-11:59 pm

1 stop7h 35m

$227

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 4/16

4:40 pm-5:45 pm

Nonstop2h 05m

Ontario

Mon 4/20

6:25 pm-9:26 pm

Nonstop2h 01m

$237

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Sat 4/18

4:43 pm-11:59 pm

1 stop7h 16m

Ontario

Tue 4/21

6:25 pm-10:17 pm

1 stop3h 52m

$260

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 5/15

7:55 pm-11:05 pm

1 stop4h 10m

Ontario

Mon 5/25

6:00 pm-1:00 am

1 stop6h 00m

$262

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 5/2

6:05 am-11:05 am

2 stops6h 00m

Ontario

Sat 5/2

4:10 pm-11:15 pm

1 stop6h 05m

$267

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Sat 5/9

5:35 am-12:19 pm

1 stop6h 44m

Ontario

Mon 5/11

1:35 pm-9:13 pm

1 stop7h 38m

$277
Quickest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 6/1

4:14 pm-5:17 pm

Nonstop2h 03m

Ontario

Sat 6/6

7:48 pm-10:47 pm

Nonstop1h 59m

$277

SpokaneOntario

GEG - ONT

GEGONT

Spokane

Sat 5/2

5:00 am-9:45 am

1 stop4h 45m

Ontario

Tue 5/5

3:26 pm-9:31 pm

1 stop6h 05m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Idaho to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Idaho 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 Idaho to Ontario

What is the cheapest month to book a flight from Idaho to Ontario?

Currently, August is the cheapest month in which you can book a flight from Idaho to Ontario (average of $77). Flying from Idaho to Ontario in February is currently the most expensive (average of $145). 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 ID to ONT?

Find hourly flight availability from Idaho to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 26, 2026.

When flying from Idaho to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Idaho to Ontario

Explore weekly flight availability from Idaho to Ontario. 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 26, 2026.

The most flights from USID to ONT are scheduled on a Monday (2 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).

How much does it cost to fly round-trip from Idaho to Ontario?

Related info for your journey

Find useful and relevant information for your journey from Idaho to Ontario. 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 into for flights to Ontario from Idaho?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from Idaho.

  • How long is the flight from Idaho to Ontario?

    For as low as $207, Southwest can have you in Ontario from Idaho in 4h 25m. The distance from Idaho to Ontario is about 661 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Idaho to Ontario one-way?

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $78. However, be on the lookout for offers from United Airlines and Southwest, as they are both options that can get you from Idaho to Ontario for a low price.

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

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

  • What are the cheapest flights from Idaho to Ontario?

    Looking at all options, your cheapest flight can be booked for $117. While the most popular route (Spokane - Ontario) can be booked for $194 on average, our data indicates $228 when flying from Idaho to Ontario.

  • Can I find deals for flights from Idaho to Ontario that include hotel bookings?

    Yes. In addition to deals on Idaho to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Ontario.

  • Can I find deals for business class flights from Idaho to Ontario?

    Yes. Cheapflights offers flight deals from Idaho to Ontario 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 Idaho to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Idaho to Ontario (average of $77). Flying from Idaho to Ontario in February is currently the most expensive (average of $145). 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 Idaho to Ontario

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Top 4 airlines flying from Idaho to Ontario

Discover the top 4 airlines that operate flights from Idaho to Ontario. 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 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$277FlexibilityNo cancel feeOn-time75%
DeltaCheapest$120Average$322FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$143Average$441FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$204Average$366FlexibilityNo cancel feeOn-time63%

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