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$129+ 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
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 September 15, 2025.

Round-trip from

$310
(KAYAK)

One-way from

$129
(Kiwi.com)

Popular in

November

Cheapest in

June

Average price

$266
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. 18% potential increase in price ($96 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1010:57 pmIDA - ONT
1 stop14h 40mMultiple Airlines
Sun 10/1210:47 pmONT - IDA
1 stop13h 02mMultiple Airlines
Deal found 9/15$315
This Delta deal was found by Cheapflights users on 9/15. 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 10/116:53 pmIDA - ONT
1 stop3h 27mDelta
Mon 10/136:00 amONT - IDA
1 stop5h 33mDelta
Deal found 9/15$331
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/86:53 pmIDA - ONT
1 stop5h 46mDelta
Sun 10/126:00 amONT - IDA
1 stop5h 33mDelta
Deal found 9/15$335
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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.
Thu 10/166:00 amIDA - ONT
1 stop7h 37mAlaska Airlines
Tue 10/211:31 pmONT - IDA
1 stop8h 07mAlaska Airlines
Deal found 9/14$419
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 12/125:04 pmIDA - ONT
1 stop23h 17mAlaska Airlines
Mon 12/156:00 amONT - IDA
1 stop9h 27mAlaska Airlines
Deal found 9/15$432
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Fri 12/124:19 pmIDA - ONT
1 stop21h 13mUnited Airlines
Mon 12/155:05 amONT - IDA
1 stop7h 30mUnited Airlines
Deal found 9/15$450
This Delta deal was found by Cheapflights users on 9/15. 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.
Fri 10/106:53 pmIDA - ONT
1 stop5h 46mDelta
Sun 10/126:00 amONT - IDA
1 stop5h 33mDelta
Deal found 9/15$472
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 10/116:00 amIDA - ONT
1 stop19h 03mAlaska Airlines
Mon 10/137:10 amONT - IDA
2 stops31h 28mAlaska Airlines
Deal found 9/15$491
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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.
Thu 10/26:13 amIDA - ONT
1 stop5h 31mAlaska Airlines
Fri 10/37:47 pmONT - IDA
1 stop18h 51mAlaska Airlines
Deal found 9/15$504
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 10/134:15 pmIDA - ONT
1 stop21h 22mAlaska Airlines
Fri 10/171:31 pmONT - IDA
1 stop25h 07mAlaska Airlines
Deal found 9/14$508

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 September 15, 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

Sun 1/11

4:19 pm-8:58 pm

1 stop5h 39m

Ontario

Mon 1/19

5:05 am-1:30 pm

1 stop7h 25m

$327

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Sat 10/11

6:53 pm-9:20 pm

1 stop3h 27m

Ontario

Mon 10/13

6:00 am-12:33 pm

1 stop5h 33m

$331

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Wed 10/8

6:53 pm-11:39 pm

1 stop5h 46m

Ontario

Sun 10/12

6:00 am-12:33 pm

1 stop5h 33m

$335

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 10/10

10:57 pm-12:37 pm

1 stop14h 40m

Ontario

Sun 10/12

10:40 pm-6:50 pm

2 stops19h 10m

$340

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Tue 2/10

4:19 pm-8:58 pm

1 stop5h 39m

Ontario

Sat 2/14

1:00 pm-9:11 pm

1 stop7h 11m

$401

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Thu 10/16

6:00 am-12:37 pm

1 stop7h 37m

Ontario

Tue 10/21

1:31 pm-10:38 pm

1 stop8h 07m

$419

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 12/12

5:04 pm-3:21 pm

1 stop23h 17m

Ontario

Mon 12/15

6:00 am-4:27 pm

1 stop9h 27m

$432

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 12/12

4:19 pm-12:32 pm

1 stop21h 13m

Ontario

Mon 12/15

5:05 am-1:35 pm

1 stop7h 30m

$450

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 10/10

6:53 pm-11:39 pm

1 stop5h 46m

Ontario

Sun 10/12

6:00 am-12:33 pm

1 stop5h 33m

$472

Idaho FallsOntario

IDA - ONT

IDAONT

Idaho Falls Fanning Field

Fri 1/23

4:00 pm-10:37 pm

1 stop7h 37m

$152

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 17 results
1
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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, August is the cheapest month in which you can book a flight from Idaho Falls to Ontario (average of $246). Flying from Idaho Falls to Ontario in March is currently the most expensive (average of $328). 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 September 15, 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 September 15, 2025.
Peruse reviews from past customers who have flown with Delta 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
8.0
Very good
7,954 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Comfort

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 3h 27m. United Airlines provides one of the quickest options available for as low as $331. Airlines will cover a distance of 717 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from Idaho Falls to Ontario round-trip?

    Flying on Delta is currently your cheapest option to Ontario, with prices starting at $164. Delta is priced at 60% 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, August is the cheapest month in which you can book a flight from Idaho Falls to Ontario (average of $246). Flying from Idaho Falls to Ontario in March is currently the most expensive (average of $328). 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 airline flying from Idaho Falls to Ontario

Discover the top airline 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$164Average$468FlexibilityNo cancel feeOn-timeN/A

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