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$158+ Cheap flights from Idaho Falls to Ontario (IDA - 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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ONT
Feb 18 — Feb 251
Wed 2/18
Wed 2/25
1 adult, Economy
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Cheap flight deals from Idaho Falls to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Idaho Falls (IDA) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$231
(Alaska Airlines)

One-way from

$158
(Alaska Airlines)

Popular in

November

Cheapest in

June

Average price

$288
Provider with most accurate pricing for Idaho Falls Fanning Field-Ontario flight deals.
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Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-Ontario flights.
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From Idaho Falls Fanning Field to Ontario
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One-way flight from Idaho Falls Fanning Field to Ontario
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Highest demand for flights based on searches. 24% potential increase in price ($137 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from Idaho Falls to Ontario

Cheapest flights from Idaho Falls to Ontario
Explore the most affordable flight options available from Idaho Falls to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 19, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/19. 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 3/35:20 pm
IDA
-
ONT
1 stop6h 24m
Alaska Airlines
Wed 3/114:02 pm
ONT
-
IDA
1 stop6h 34m
Alaska Airlines
Deal found 1/19$217
This Alaska Airlines deal was found by Cheapflights users on 1/19. 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 3/45:20 pm
IDA
-
ONT
1 stop6h 24m
Alaska Airlines
Wed 3/114:02 pm
ONT
-
IDA
1 stop6h 34m
Alaska Airlines
Deal found 1/19$231
This Delta deal was found by Cheapflights users on 1/18. 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.
Tue 2/106:35 pm
IDA
-
ONT
1 stop6h 23m
Delta
Wed 2/185:00 pm
ONT
-
IDA
1 stop4h 21m
Delta
Deal found 1/18$245
This Alaska Airlines deal was found by Cheapflights users on 1/19. 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 3/25:20 pm
IDA
-
ONT
1 stop7h 12m
Alaska Airlines
Wed 3/114:02 pm
ONT
-
IDA
1 stop6h 34m
Alaska Airlines
Deal found 1/19$266
This Alaska Airlines deal was found by Cheapflights users on 1/19. 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 2/275:20 pm
IDA
-
ONT
1 stop7h 12m
Alaska Airlines
Wed 3/114:02 pm
ONT
-
IDA
1 stop6h 34m
Alaska Airlines
Deal found 1/19$280
This Delta deal was found by Cheapflights users on 1/18. 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.
Mon 3/26:35 pm
IDA
-
ONT
1 stop6h 14m
Delta
Tue 3/35:00 pm
ONT
-
IDA
1 stop4h 21m
Delta
Deal found 1/18$283
This United Airlines deal was found by Cheapflights users on 1/19. 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.
Sat 2/142:40 pm
IDA
-
ONT
1 stop7h 10m
United Airlines
Sat 2/215:00 am
ONT
-
IDA
1 stop7h 30m
United Airlines
Deal found 1/19$287
This Alaska Airlines deal was found by Cheapflights users on 1/18. 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 5/64:08 pm
IDA
-
ONT
1 stop7h 24m
Alaska Airlines
Sun 5/103:26 pm
ONT
-
IDA
1 stop6h 14m
Alaska Airlines
Deal found 1/18$294
This Alaska Airlines deal was found by Cheapflights users on 1/18. 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.
Tue 5/56:00 am
IDA
-
ONT
2 stops9h 19m
Alaska Airlines
Tue 5/123:26 pm
ONT
-
IDA
1 stop6h 14m
Alaska Airlines
Deal found 1/18$296
This Delta deal was found by Cheapflights users on 1/18. 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 5/26:57 pm
IDA
-
ONT
1 stop4h 46m
Delta
Sat 5/95:05 pm
ONT
-
IDA
1 stop4h 09m
Delta
Deal found 1/18$311
This Delta deal was found by Cheapflights users on 1/19. 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 2/281:10 pm
IDA
-
ONT
2 stops10h 27m
Delta
Thu 3/126:00 am
ONT
-
IDA
1 stop5h 27m
Delta
Deal found 1/19$312

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho Falls 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 January 19, 2026.
Use the filters below to find and compare flights from Idaho Falls to Ontario that are best for you.

Fly from

Idaho Falls

Fly to

Ontario

Route

Depart

Return

Price

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Wed 5/6

4:08 pm-10:32 pm

1 stop7h 24m

Ontario

Tue 5/12

3:26 pm-10:40 pm

1 stop6h 14m

$245

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Wed 2/11

6:35 pm-11:58 pm

1 stop6h 23m

Ontario

Wed 2/18

5:00 pm-10:21 pm

1 stop4h 21m

$245

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Sat 5/2

6:57 pm-10:43 pm

1 stop4h 46m

Ontario

Wed 5/13

5:05 pm-10:14 pm

1 stop4h 09m

$245

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Wed 5/6

4:08 pm-10:32 pm

1 stop7h 24m

Ontario

Sat 5/9

3:26 pm-10:40 pm

1 stop6h 14m

$245

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Tue 5/5

6:57 pm-11:44 pm

1 stop5h 47m

Ontario

Tue 5/12

5:05 pm-10:14 pm

1 stop4h 09m

$245

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Mon 3/2

5:20 pm-11:32 pm

1 stop7h 12m

Ontario

Wed 3/11

4:02 pm-11:36 pm

1 stop6h 34m

$266

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Wed 3/4

5:20 pm-10:44 pm

1 stop6h 24m

Ontario

Thu 3/12

4:02 pm-11:36 pm

1 stop6h 34m

$280

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 2/27

5:20 pm-11:32 pm

1 stop7h 12m

Ontario

Wed 3/11

4:02 pm-11:36 pm

1 stop6h 34m

$280

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Sat 2/28

5:20 pm-11:32 pm

1 stop7h 12m

Ontario

Wed 3/11

4:02 pm-11:36 pm

1 stop6h 34m

$280

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Tue 3/3

5:20 pm-10:44 pm

1 stop6h 24m

Ontario

Tue 3/10

4:02 pm-11:36 pm

1 stop6h 34m

$280

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

Showing 1-10 of 19 results
1
2

Compare providers for flights from Idaho Falls to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Idaho Falls to Ontario in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Idaho Falls-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Idaho Falls-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Idaho Falls-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Idaho Falls-Ontario flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Idaho Falls-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Idaho Falls to Ontario

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

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

Currently, May is the cheapest month in which you can book a flight from Idaho Falls to Ontario (average of $88). Flying from Idaho Falls to Ontario in June is currently the most expensive (average of $164). 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.

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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated January 19, 2026.
Peruse reviews from past customers who have flown with Delta and United Airlines from Idaho Falls to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,075 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
7.9
Good
8,075 reviews
Delta
7.9
Good
8,075 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
9,177 reviews
Delta
7.9
Good
8,075 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Idaho Falls to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho Falls to Ontario?

    A quick flight from Idaho Falls to Ontario can take about 6h 23m. Alaska Airlines provides one of the quickest options available for as low as $245. Airlines will cover a distance of 717 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Idaho Falls to Ontario round-trip?

    Flying on Delta is currently your cheapest option to Ontario, with prices starting at $164. Another option worth looking into is United Airlines, starting at $289 round trip. Delta is priced at 61% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

    Currently, May is the cheapest month in which you can book a flight from Idaho Falls to Ontario (average of $88). Flying from Idaho Falls to Ontario in June is currently the most expensive (average of $164). 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 Falls to Ontario

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Top 2 airlines flying from Idaho Falls to Ontario

Discover the top 2 airlines that operate flights from Idaho Falls 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 January 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$164Average$404FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$289Average$565FlexibilityNo cancel feeOn-time69%

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