HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$76+ Cheap flights from Oregon to Ontario (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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Oregon to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Oregon to Ontario

Cheapest flights from Oregon to Ontario
Explore the most affordable flight options available from Oregon to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

This CheapOair deal was found by Cheapflights users on 1/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/215:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Wed 2/257:59 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Deal found 1/26$117
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 2/215:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Tue 2/247:59 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Deal found 1/27$137
This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 3/65:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Tue 3/107:59 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Deal found 1/26$147
This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 2/279:30 pm
PDX
-
ONT
Nonstop2h 22m
Alaska Airlines
Fri 3/67:00 am
ONT
-
PDX
Nonstop2h 28m
Alaska Airlines
Deal found 1/26$157
This CheapOair deal was found by Cheapflights users on 1/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:50 pm
BOI
-
ONT
Nonstop2h 07m
Alaska Airlines
Sat 2/217:37 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Deal found 1/27$157
This Expedia deal was found by Cheapflights users on 1/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/215:50 pm
BOI
-
ONT
Nonstop2h 07m
Multiple Airlines
Wed 2/258:40 am
ONT
-
BOI
1 stop26h 11m
Multiple Airlines
Deal found 1/27$158
This Frontier deal was found by Cheapflights users on 1/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2512:27 pm
PDX
-
ONT
1 stop11h 28m
Frontier
Mon 5/412:59 am
ONT
-
PDX
1 stop12h 03m
Frontier
Deal found 1/26$160
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Tue 2/241:40 pm
PDX
-
ONT
1 stop4h 01m
United Airlines
Wed 2/255:00 am
ONT
-
PDX
1 stop8h 44m
United Airlines
Deal found 1/26$163
This Delta deal was found by Cheapflights users on 1/28. 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 2/257:15 am
PDX
-
ONT
1 stop6h 39m
Delta
Sat 2/283:30 pm
ONT
-
PDX
1 stop7h 18m
Delta
Deal found 1/28$167
This Southwest deal was found by Cheapflights users on 1/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/55:50 am
PDX
-
ONT
1 stop6h 35m
Southwest
Sat 3/74:35 pm
ONT
-
PDX
2 stops8h 20m
Southwest
Deal found 1/26$172
This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 2/217:45 am
PDX
-
ONT
Nonstop2h 19m
Alaska Airlines
Thu 2/266:08 pm
ONT
-
PDX
Nonstop2h 25m
Alaska Airlines
Deal found 1/26$177
This Southwest deal was found by Cheapflights users on 1/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/45:05 am
PDX
-
ONT
2 stops7h 20m
Southwest
Sun 3/86:15 am
ONT
-
PDX
1 stop7h 20m
Southwest
Deal found 1/26$178

Find flight deals from Oregon to Ontario

Keep the following information in mind while searching for Oregon to Ontario flight deals. Data was last updated January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$117
(CheapOair)

One-way from

$76
(Kiwi.com)

Popular in

November

Cheapest in

February

Average price

$197

Good round-trip deal

$197 or less

Good one-way deal

$188 or less
Provider with most accurate pricing for Portland-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Los Angeles flights.
Search Deals
From Oregon to Ontario
Search Deals
One-way flight from Oregon to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($19 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Oregon to Ontario.
Search Deals
Price to beat on a one-way flight from Oregon to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Oregon 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 28, 2026.
Use the filters below to find and compare flights from Oregon to Ontario that are best for you.

Fly from

Oregon

Fly to

Ontario

Route

Depart

Return

Price

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 2/21

5:15 pm-10:37 pm

1 stop6h 22m

Ontario

Wed 2/25

3:30 pm-9:56 pm

1 stop5h 26m

$137

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 2/25

8:50 am-1:54 pm

1 stop6h 04m

Ontario

Wed 3/4

5:00 pm-11:05 pm

1 stop5h 05m

$137

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 4/25

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Mon 4/27

2:59 pm-5:59 pm

Nonstop2h 00m

$147

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 2/24

6:40 am-12:25 pm

1 stop6h 45m

Ontario

Tue 3/3

5:35 pm-10:15 pm

1 stop3h 40m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 2/19

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Wed 2/25

7:00 am-9:28 am

Nonstop2h 28m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 3/15

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Sun 3/22

7:00 am-9:28 am

Nonstop2h 28m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 2/24

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Sat 2/28

7:00 am-9:28 am

Nonstop2h 28m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 3/1

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Mon 3/9

6:08 pm-8:33 pm

Nonstop2h 25m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 2/18

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Wed 2/25

7:00 am-9:28 am

Nonstop2h 28m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 2/20

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Fri 2/27

7:00 am-9:28 am

Nonstop2h 28m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Oregon to Ontario

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

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

Currently, October is the cheapest month in which you can book a flight from Oregon to Ontario (average of $50). Flying from Oregon to Ontario in November is currently the most expensive (average of $107). 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 OR to ONT?

Find hourly flight availability from Oregon 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 January 28, 2026.

It’s typically best to fly out from Oregon to Ontario in the morning. Doing so could potentially save you 40% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from Oregon to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Oregon to Ontario. Price data was last updated on January 24, 2026.

Travelers seeking maximum savings on their Oregon to Ontario flight should consider departing on Friday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Oregon to Ontario

Explore weekly flight availability from Oregon to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 28, 2026.

The most flights from USOR to ONT are scheduled on a Monday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

Related info for your journey

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

  • What airport do you fly into for flights to Ontario from Oregon?

    Ontario (ONT) is the airport you will fly into if you book a flight from Oregon to Ontario. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

  • How popular is this Oregon to Ontario flight route?

    This flight path from Oregon to Ontario was viewed by 35 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Oregon to Ontario?

    Airlines like Delta, Alaska Airlines, and Southwest fly from Oregon to Ontario in about 2h 04m. The time it takes to get you to your destination can typically vary by up to 4h 41m. There are 661 mi between Oregon and Ontario. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Oregon to Ontario one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $46. Users have also found prices from $78 and $88 on Southwest and United Airlines, respectively.

  • What are the most popular routes from Oregon to Ontario?

    The most popular route from Oregon to Ontario is Portland - Ontario. You may also consider Eugene - Ontario or Boise Air Term. Gowen Fld - Ontario.

  • What are the most reliable airlines from Oregon to Ontario?

    No one likes to see their flight delayed. When booking a flight from Oregon to Ontario consider choosing Horizon Air (95%), British Airways (93%) or Frontier (86%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Oregon to Ontario?

    The cheapest flight price from Oregon to Ontario is $78. On average you can expect to pay $357. The most popular route, (Portland - Ontario), can usually be booked for $147.

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

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

  • How can I find direct flights from Oregon to Ontario?

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

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

    Yes. Cheapflights offers flight deals from Oregon 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 Oregon to Ontario?

    Currently, October is the cheapest month in which you can book a flight from Oregon to Ontario (average of $50). Flying from Oregon to Ontario in November is currently the most expensive (average of $107). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Oregon to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Las Vegas flights
John F Kennedy Intl to Los Angeles flights
Newark to Las Vegas flights
O'Hare Intl to Las Vegas flights
Seattle to Los Angeles flights
Seattle to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Boston to San Francisco flights
San Francisco to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
O'Hare Intl to Los Angeles flights
Newark to Los Angeles flights
Dulles Intl to Las Vegas flights
Minneapolis to Las Vegas flights
Newark to San Francisco flights
Seattle to Ontario flights
Atlanta to Las Vegas flights
LaGuardia to Los Angeles flights
Seattle to San Diego flights
San Francisco to Los Angeles flights
LaGuardia to Las Vegas flights
Denver to Las Vegas flights
Los Angeles to San Francisco flights
Los Angeles to Las Vegas flights
Boston to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Santa Ana flights
Reagan-National to Los Angeles flights
Dulles Intl to Los Angeles flights
Dallas/Fort Worth to San Francisco flights
O'Hare Intl to San Francisco flights
Baltimore to Los Angeles flights
Reagan-National to Las Vegas flights
Boston to Los Angeles flights
Ontario to San Francisco flights
Baltimore to Las Vegas flights
Orlando to Las Vegas flights
Atlanta to Los Angeles flights
San Francisco to Ontario flights
Seattle to San Francisco flights
Dallas/Fort Worth to Los Angeles flights
Los Angeles to San Jose flights
Burbank to Las Vegas flights
Santa Ana to San Francisco flights
Hobby to Las Vegas flights
Denver to Los Angeles flights
Portland to Los Angeles flights
Burbank to San Francisco flights
San Jose to Las Vegas flights
Santa Ana to Las Vegas flights

Top 6 airlines flying from Oregon to Ontario

Discover the top 6 airlines that operate flights from Oregon 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 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$53Average$146FlexibilityNo cancel feeOn-time62%
DeltaCheapest$83Average$275FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$88Average$218FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$142Average$315FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$157Average$338FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$173Average$298FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
Cookie settings©2026 Cheapflights