$140 Cheap Delta flights Idaho Falls (IDA) to Ontario (ONT)

View $140 flight on Wed, Sep 3, 2025Opens in a new window

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$140 Cheap Delta flights Idaho Falls (IDA) to Ontario (ONT)

Prices were available within the past 7 days and start at $140 for one-way flights and $267 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Aug 30 - Sun, Aug 31
IDA
Idaho Falls
ONT
Ontario
$267 Roundtrip, found 6 days ago
$267
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, Aug 30 from Idaho Falls to Ontario, returning Sun, Aug 31, priced at $267 found 6 days ago
Delta
Sat, Aug 30 - Mon, Sep 1
IDA
Idaho Falls
ONT
Ontario
$284 Roundtrip, found 6 days ago
$284
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, Aug 30 from Idaho Falls to Ontario, returning Mon, Sep 1, priced at $284 found 6 days ago
Delta
Wed, Sep 24 - Mon, Sep 29
IDA
Idaho Falls
ONT
Ontario
$293 Roundtrip, found 2 days ago
$293
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Sep 24 from Idaho Falls to Ontario, returning Mon, Sep 29, priced at $293 found 2 days ago
Delta
Thu, Aug 28 - Sun, Aug 31
IDA
Idaho Falls
ONT
Ontario
$298 Roundtrip, found 6 days ago
$298
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Aug 28 from Idaho Falls to Ontario, returning Sun, Aug 31, priced at $298 found 6 days ago
Delta
Fri, Aug 22 - Tue, Sep 16
IDA
Idaho Falls
ONT
Ontario
$308 Roundtrip, found 5 days ago
$308
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, Aug 22 from Idaho Falls to Ontario, returning Tue, Sep 16, priced at $308 found 5 days ago
Delta
Tue, Aug 26 - Sat, Sep 20
IDA
Idaho Falls
ONT
Ontario
$309 Roundtrip, found 5 days ago
$309
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Aug 26 from Idaho Falls to Ontario, returning Sat, Sep 20, priced at $309 found 5 days ago
Flights from Idaho Falls (IDA) to Ontario (ONT)
Origin airport
Idaho Falls Regional
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Popular airline
Delta
Distance
717 mi

Frequently asked questions

How much is a Delta Air Lines flight from Idaho Falls Regional Airport (IDA) to Los Angeles - Ontario Intl. Airport (ONT)?
Grab affordable return Delta Air Lines flights from $267 from IDA to ONT by sorting your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $140 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IDA to ONT with Delta Air Lines?
January is one of the cheapest months to jet away to Ontario with Delta Air Lines. You could also find great deals on one-way and return fares in April.
What is the cheapest time to book flights from Idaho Falls Regional Airport (IDA) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
To find cheap Delta Air Lines fares from Idaho Falls Regional Airport (IDA) to Los Angeles - Ontario Intl. Airport (ONT), start searching one to three months before your planned departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the overall cost. Sunday tends to be the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Idaho Falls Regional Airport (IDA) to Los Angeles - Ontario Intl. Airport (ONT)?
Fill in your dates, click search and select the "Nonstop" filter on Expedia to find any direct flights from IDA to ONT with Delta Air Lines or other carriers.
What is the earliest Delta Air Lines flight from IDA to ONT?
Sort your results by "Morning" and "Early Morning" to browse the earliest flights from IDA to ONT. Jetting off early means you're 20% less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Ontario?
Los Angeles - Ontario Intl. Airport (ONT) is the primary Ontario gateway for Delta Air Lines flights from Idaho Falls Regional Airport (IDA).
Why fly with Delta Air Lines from IDA to ONT?
Taking off from IDA to ONT with Delta Air Lines comes with plenty of perks, such as an excellent in-flight experience and a rewarding loyalty program. Plus, when booking through Expedia, One Key™ members can earn OneKeyCash™* to use on select future travel purchases. That's in addition to the Delta SkyMiles points you can earn with Delta Air Lines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Idaho Falls Regional Airport (IDA) to Los Angeles - Ontario Intl. Airport (ONT)?
Changes are usually free within 24 hours of booking, but your airline may add a charge after that. For more details about modifying your reservation, head to your "Trips," select your flight and click on "Manage Booking." If you'd like the flexibility to change your plans without extra charges, tick the "Changes included" and "No cancel fee" filters when planning your next adventure.

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*Available to One Key members.