$57 Cheap Flights to Ontario, OR

View $57 flight on Tue, Jun 16, 2026Opens in a new window

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Popular airlines to Ontario

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How much is the cheapest flight to Ontario?

Prices were available within the past 7 days and start at $57 for one-way flights and $114 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Jun 9 - Tue, Jun 16
DEN
Denver
BOI
Boise
$114 Roundtrip, found 3 hours ago
$114
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Tue, Jun 9 from Denver to Boise, returning Tue, Jun 16, priced at $114 found 3 hours ago
American Airlines
Sat, Sep 12 - Tue, Sep 15
SAN
San Diego
BOI
Boise
$159 Roundtrip, found 2 days ago
$159
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Sep 12 from San Diego to Boise, returning Tue, Sep 15, priced at $159 found 2 days ago
Delta
Thu, Jun 18 - Sat, Jun 20
SAN
San Diego
BOI
Boise
$165 Roundtrip, just found
$165
Roundtrip
just found
Select Delta flight, departing Thu, Jun 18 from San Diego to Boise, returning Sat, Jun 20, priced at $165 just found
Southwest Airlines
Wed, May 6 - Tue, May 12
ONT
Ontario
BOI
Boise
$167 Roundtrip, just found
$167
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, May 6 from Ontario to Boise, returning Tue, May 12, priced at $167 just found
Alaska Airlines
Wed, May 13 - Tue, May 19
PDX
Portland
BOI
Boise
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, May 13 from Portland to Boise, returning Tue, May 19, priced at $177 just found

Frequently asked questions

What month is the cheapest to fly to Ontario?
The cheapest month to fly to Ontario is June when demand is low. Off-peak months are usually when you'll find cheap flights. To save money, avoid flying during major holidays and school breaks.
Which US cities have the cheapest flights to Ontario?
Get cheap flights to Ontario from Seattle, Denver and Phoenix. These cities generally offer the best fares to this much-loved destination. But bear in mind that seasonality, demand and stopovers also influence rates, so stay flexible and book when you see a bargain.
Which US cities fly direct to Ontario?
You can fly to Ontario without a stopover from 22 US destinations. To find a nonstop route, use the "Direct flights only" filter when looking for flights to Ontario on Expedia. Then, compare the options and pick the best departure out of one of these cities:

  • Seattle
  • Denver
  • Phoenix
  • Salt Lake City
  • Portland

How to find a cheap flight to Ontario?
Book early to score cheap flights to Ontario. Also, consider visiting during off-peak months like December and January. If you fly on a Thursday, you can save 16% on average compared to those departing on a Sunday.* Save time checking every day and set up a price alert on the Expedia app. We'll let you know when fares change.*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
How to get a cheap last-minute flight to Ontario?
You can find awesome deals on last-minute flights to Ontario, especially if your travel plans are flexible. Think about leaving from a different hub, changing your dates or choosing an alternative carrier to get a cheap flight to Ontario.
How far in advance should I book a flight to Ontario?
Secure the travel dates you want and a fare your budget will love by booking your domestic flight to Ontario up to 28 days in advance. Lock in tickets between two and four months ahead if you're jetting to Ontario from an international destination.**Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
Which day of the week is the cheapest day to buy a plane ticket to Ontario?
You'll save an average of 8% if you purchase plane tickets on a Sunday instead of Fridays, which tend to be the priciest day to book.* When it comes to getting a cheap flight to Ontario, it's all about having good timing.*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.
Which airlines fly to Ontario?
A total of 6 carriers connect 19 airports across the globe to Ontario. Here are a few of the major airlines to Ontario, where Boise Airport (BOI) is the major arrival point:

  • Alaska Airlines
  • Delta Air Lines
  • United Airlines
  • American Airlines

Where do you fly into Ontario?
Boise Airport (BOI) is the main airport for travelers flying to Ontario. Or you could jet into Ontario, OR (ONO-Ontario Municipal). Compare fares between the two airports to find the easiest or cheapest way to fly to Ontario.
How far is the airport from central Ontario?
You'll be approximately 50 mi southeast of central Ontario after landing at Boise Airport (BOI).
Can I save money by booking an Ontario trip package?
Book an Ontario flight and hotel package deal on Expedia, and you can make significant savings. It's simple to bundle your flights and accommodations, and you can add car rentals and activities to create your own personalized Ontario break. Plus, there's nothing like the convenience of booking everything in the same place.
Can I change or cancel my flight to Ontario?
It's usually possible to cancel or change your flight to Ontario. Many airlines let you cancel your flights for free within 24 hours of booking. However, some flights are non-refundable, and airlines may offer you credit for a future trip instead of a direct refund. To reserve affordable flights to Ontario with flexible change policies, pick "Changes included" or "No cancel fee" when you search. Want more information? Visit our Customer Service Portal.

*Flight schedules are subject to change.

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Travel information

Destination airport
Boise
Destination airport IATA code
BOI
Destination city name
Boise
Roundtrip price
$114

Trending flights to Ontario

Prices were available within the past 7 days and start at $57 for one-way flights and $114 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, Jun 9 - Tue, Jun 16
DEN
Denver
BOI
Boise
$114 Roundtrip, found 3 hours ago
$114
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Tue, Jun 9 from Denver to Boise, returning Tue, Jun 16, priced at $114 found 3 hours ago

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