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$108+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ONT
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
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Cheap 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 December 21, 2025.

This Delta deal was found by Cheapflights users on 12/18. 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 12/301:10 pmIDA - ONT
1 stop4h 02mDelta
Thu 1/155:07 pmONT - IDA
1 stop4h 12mDelta
Deal found 12/18$465
This Delta deal was found by Cheapflights users on 12/18. 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 12/301:10 pmIDA - ONT
1 stop4h 02mDelta
Tue 1/135:07 pmONT - IDA
1 stop4h 12mDelta
Deal found 12/18$468
This Delta deal was found by Cheapflights users on 12/18. 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 12/301:10 pmIDA - ONT
1 stop4h 02mDelta
Mon 1/125:07 pmONT - IDA
1 stop4h 12mDelta
Deal found 12/18$508
This Delta deal was found by Cheapflights users on 12/18. 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 12/301:10 pmIDA - ONT
1 stop4h 02mDelta
Fri 1/95:07 pmONT - IDA
1 stop4h 12mDelta
Deal found 12/18$512
This Delta deal was found by Cheapflights users on 12/18. 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 12/301:10 pmIDA - ONT
1 stop4h 02mDelta
Fri 1/161:11 pmONT - IDA
1 stop3h 40mDelta
Deal found 12/18$539
This United Airlines deal was found by Cheapflights users on 12/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:05 pmIDA - ONT
1 stop6h 02mUnited Airlines
Sat 1/105:05 amONT - IDA
1 stop7h 25mUnited Airlines
Deal found 12/18$548
This United Airlines deal was found by Cheapflights users on 12/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/294:05 pmIDA - ONT
1 stop6h 02mUnited Airlines
Thu 1/15:05 amONT - IDA
1 stop7h 25mUnited Airlines
Deal found 12/20$551
This United Airlines deal was found by Cheapflights users on 12/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:40 amIDA - ONT
1 stop6h 58mUnited Airlines
Wed 12/315:05 amONT - IDA
1 stop7h 25mUnited Airlines
Deal found 12/20$566
This United Airlines deal was found by Cheapflights users on 12/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:05 pmIDA - ONT
1 stop6h 02mUnited Airlines
Fri 1/95:05 amONT - IDA
1 stop7h 25mUnited Airlines
Deal found 12/18$578
This Delta deal was found by Cheapflights users on 12/18. 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 12/301:10 pmIDA - ONT
1 stop4h 02mDelta
Wed 1/75:07 pmONT - IDA
1 stop4h 12mDelta
Deal found 12/18$586
This Delta deal was found by Cheapflights users on 12/19. 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.
Mon 12/296:57 pmIDA - ONT
1 stop5h 57mDelta
Wed 12/316:00 amONT - IDA
1 stop5h 27mDelta
Deal found 12/19$596

Find 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 December 21, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$224
(Alaska Airlines)

One-way from

$108
(Kiwi.com)

Popular in

November

Cheapest in

June

Average price

$565
Provider with most accurate pricing for Idaho Falls Fanning Field-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-Ontario flights.
Search Deals
From Idaho Falls Fanning Field to Ontario
Search Deals
One-way flight from Idaho Falls Fanning Field to Ontario
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($137 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 21, 2025.
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 1/21

6:58 pm-3:08 pm

1 stop21h 10m

Ontario

Sat 1/24

11:53 am-10:59 pm

1 stop10h 06m

$224

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Thu 1/8

6:58 pm-11:56 pm

1 stop5h 58m

Ontario

Sat 1/10

11:53 am-6:18 pm

1 stop5h 25m

$284

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Thu 1/22

9:00 am-11:56 pm

1 stop15h 56m

Ontario

Sun 1/25

6:00 am-10:59 pm

1 stop15h 59m

$285

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 1/9

6:58 pm-11:56 pm

1 stop5h 58m

Ontario

Mon 1/12

11:53 am-6:18 pm

1 stop5h 25m

$285

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Thu 1/8

6:58 pm-11:56 pm

1 stop5h 58m

Ontario

Thu 1/15

4:03 pm-10:59 pm

1 stop5h 56m

$297

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 1/9

6:58 pm-11:56 pm

1 stop5h 58m

Ontario

Sun 1/11

6:00 am-6:18 pm

1 stop11h 18m

$305

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 1/9

6:58 pm-11:56 pm

1 stop5h 58m

Ontario

Wed 1/14

7:00 am-6:18 pm

2 stops10h 18m

$313

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Thu 1/8

6:58 pm-11:56 pm

1 stop5h 58m

Ontario

Wed 1/14

1:46 pm-10:59 pm

2 stops8h 13m

$321

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Sat 3/7

8:00 am-11:32 pm

1 stop16h 32m

Ontario

Sat 3/14

12:02 pm-11:36 pm

1 stop10h 34m

$333

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Mon 1/12

9:20 pm-5:54 pm

1 stop21h 34m

$108

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Idaho Falls-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

What is the cheapest time of day to fly from IDA to ONT?

Find hourly flight availability from Idaho Falls 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 December 21, 2025.

It’s optimal to fly from Idaho Falls to Ontario in the morning. By choosing this option you can save up to 80% on the cost of your flight, compared to a flight at noon.

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 December 21, 2025.
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
8,021 reviews

Food

7.3

Comfort

7.9

Boarding

8.1

Entertainment

7.9

Crew

8.5

Overall

7.9

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
8,021 reviews
Delta
7.9
Good
8,021 reviews

Food

7.3

Comfort

7.9

Boarding

8.1

Entertainment

7.9

Crew

8.5

Overall

7.9

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
9,099 reviews
Delta
7.9
Good
8,021 reviews

Food

7.3

Comfort

7.9

Boarding

8.1

Entertainment

7.9

Crew

8.5

Overall

7.9

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 21h 10m. Alaska Airlines provides one of the quickest options available for as low as $224. Airlines will cover a distance of 717 mi.

  • 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$164Average$404FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$289Average$565FlexibilityNo cancel feeOn-time69%

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