HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$75+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
May 29 — Jun 51
Fri 5/29
Fri 6/5
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 April 29, 2026.

This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/24:14 pm
BOI
-
ONT
Nonstop2h 03m
Alaska Airlines
Sat 6/67:48 pm
ONT
-
BOI
Nonstop1h 59m
Alaska Airlines
Deal found 4/28$157
This Delta deal was found by Cheapflights users on 4/25. 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 5/166:41 pm
BOI
-
ONT
1 stop5h 04m
Delta
Wed 5/206:00 am
ONT
-
BOI
1 stop4h 56m
Delta
Deal found 4/25$167
This CheapOair deal was found by Cheapflights users on 4/27. 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.
Tue 5/265:46 pm
PDX
-
ONT
1 stop16h 19m
Frontier
Wed 6/34:39 pm
ONT
-
PDX
1 stop17h 41m
Frontier
Deal found 4/27$171
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/2511:15 am
PDX
-
ONT
1 stop20h 49m
Frontier
Thu 6/43:30 pm
ONT
-
PDX
1 stop18h 50m
Frontier
Deal found 4/26$175
This Expedia deal was found by Cheapflights users on 4/25. 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 5/3011:29 am
PDX
-
ONT
1 stop20h 35m
Frontier
Wed 6/34:39 pm
ONT
-
PDX
1 stop17h 41m
Frontier
Deal found 4/25$180
This Trip.com deal was found by Cheapflights users on 4/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/158:46 pm
PDX
-
ONT
1 stop18h 23m
Frontier
Wed 5/204:39 pm
ONT
-
PDX
1 stop17h 41m
Frontier
Deal found 4/25$181
This Frontier deal was found by Cheapflights users on 4/26. 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.
Sun 5/179:46 pm
PDX
-
ONT
1 stop10h 03m
Frontier
Sat 5/236:00 am
ONT
-
PDX
1 stop10h 46m
Frontier
Deal found 4/26$185
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/193:14 pm
BOI
-
ONT
1 stop8h 20m
Delta
Tue 6/26:45 am
ONT
-
BOI
1 stop6h 56m
Delta
Deal found 4/27$187
This Frontier deal was found by Cheapflights users on 4/29. 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.
Wed 6/105:20 pm
PDX
-
ONT
1 stop6h 29m
Frontier
Tue 6/166:00 am
ONT
-
PDX
1 stop10h 35m
Frontier
Deal found 4/29$190
This CheapOair deal was found by Cheapflights users on 4/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2812:35 pm
PDX
-
ONT
1 stop11h 14m
Frontier
Thu 6/411:51 am
ONT
-
PDX
1 stop22h 29m
Frontier
Deal found 4/28$191
This CheapOair deal was found by Cheapflights users on 4/27. 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.
Sun 5/311:25 pm
BOI
-
ONT
1 stop21h 40m
Frontier
Sat 6/610:50 am
ONT
-
BOI
1 stop24h 48m
Frontier
Deal found 4/27$191
This CheapOair deal was found by Cheapflights users on 4/27. 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.
Tue 5/265:46 pm
PDX
-
ONT
1 stop16h 19m
Frontier
Thu 5/2810:50 am
ONT
-
PDX
1 stop5h 56m
Frontier
Deal found 4/27$192

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 April 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$157
(Alaska Airlines)

One-way from

$75
(Super.com)

Popular in

March

Cheapest in

January

Average price

$251

Good round-trip deal

$247 or less

Good one-way deal

$188 or less
Provider with most accurate pricing for Portland-Los Angeles Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Los Angeles 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. 15% potential increase in price ($41 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 29, 2026.
Use the filters below to find and compare flights from Oregon to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 5/30

6:00 pm-10:34 pm

1 stop5h 34m

Ontario

Tue 6/2

4:57 pm-9:44 pm

1 stop3h 47m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 5/26

8:00 am-10:21 am

Nonstop2h 21m

Ontario

Tue 6/2

5:57 pm-8:21 pm

Nonstop2h 24m

$207

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 5/23

5:01 pm-10:45 pm

1 stop5h 44m

Ontario

Tue 5/26

6:45 am-11:39 am

1 stop4h 54m

$207

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 5/24

5:30 am-11:12 am

1 stop5h 42m

Ontario

Tue 5/26

6:45 am-11:39 am

1 stop4h 54m

$217

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 5/29

5:15 am-12:12 pm

1 stop6h 57m

Ontario

Sun 5/31

6:00 am-10:28 am

1 stop4h 28m

$227

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 6/12

5:50 pm-10:41 pm

1 stop4h 51m

Ontario

Tue 6/16

9:40 am-4:19 pm

1 stop6h 39m

$233

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 6/2

6:07 pm-11:58 pm

1 stop6h 51m

Ontario

Sat 6/6

7:48 pm-10:47 pm

Nonstop1h 59m

$247

RedmondOntario

RDM - ONT

RDMONT

Bend/Redmond

Fri 5/15

6:55 pm-10:59 pm

1 stop4h 04m

Ontario

Sun 5/17

6:00 am-11:53 am

1 stop5h 53m

$259

RedmondOntario

RDM - ONT

RDMONT

Bend/Redmond

Fri 8/28

4:02 pm-8:24 pm

1 stop4h 22m

Ontario

Sun 8/30

6:00 am-12:34 pm

1 stop6h 34m

$259

RedmondOntario

RDM - ONT

RDMONT

Bend/Redmond

Sat 6/6

5:00 am-12:47 pm

1 stop7h 47m

Ontario

Tue 6/9

6:00 am-12:12 pm

1 stop6h 12m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 60 resultsSorted by cheapest first
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

How far ahead should I book a flight from Oregon to Ontario?

The best time to book flights from Oregon to Ontario is 46 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from Oregon to Ontario (average of $34). Flying from Oregon to Ontario in February is currently the most expensive (average of $121). 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 April 29, 2026.

It’s typically best to fly out from Oregon to Ontario in the morning. Doing so could potentially save you 37% 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 April 25, 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 April 29, 2026.

The most flights from USOR to ONT are scheduled on a Tuesday (5 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

How much does it cost to fly round-trip from Oregon to Ontario?

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 32 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, United Airlines, and Alaska Airlines fly from Oregon to Ontario in about 5h 34m. The time it takes to get you to your destination can typically vary by up to 1h 23m. 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 $50. Users have also found prices from $75 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 Boise Air Term. Gowen Fld - Ontario or Medford - 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 (89%), Hawaiian Airlines (88%) or Alaska Airlines (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 $148. On average you can expect to pay $293. The most popular route, (Portland - Ontario), can usually be booked for $197.

  • 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, November is the cheapest month in which you can book a flight from Oregon to Ontario (average of $34). Flying from Oregon to Ontario in February is currently the most expensive (average of $121). 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 San Francisco flights
Newark to San Francisco flights
LaGuardia to San Francisco flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Newark to Los Angeles flights
Seattle to Las Vegas flights
San Francisco to Las Vegas flights
Newark to Las Vegas flights
O'Hare Intl to Las Vegas flights
Seattle to Los Angeles flights
Dallas/Fort Worth to Los Angeles flights
Dallas/Fort Worth to Las Vegas flights
Dulles Intl to Las Vegas flights
LaGuardia to Los Angeles flights
San Francisco to Los Angeles flights
Dallas/Fort Worth to San Francisco flights
LaGuardia to Las Vegas flights
Los Angeles to Las Vegas flights
Atlanta to Las Vegas flights
Los Angeles to San Francisco flights
O'Hare Intl to Los Angeles flights
Denver to Las Vegas flights
Seattle to San Francisco flights
San Francisco to Santa Ana flights
Burbank to Las Vegas flights
Baltimore to Las Vegas flights
Reagan-National to Las Vegas flights
Hobby to Los Angeles flights
Stewart to San Francisco flights
Santa Ana to Las Vegas flights
Dulles Intl to Los Angeles flights
Hobby to Las Vegas flights
Atlanta to Los Angeles flights
Santa Ana to San Francisco flights
Baltimore to Los Angeles flights
Reagan-National to Los Angeles flights
Ontario to San Francisco flights
Boston to Los Angeles flights
Boston to San Francisco flights
Boston to Las Vegas flights
O'Hare Intl to San Francisco flights
Detroit to Las Vegas flights
Dallas/Fort Worth to Ontario flights
Dulles Intl to San Francisco flights
John F Kennedy Intl to San Jose flights
Portland to Las Vegas flights
Orlando to Las Vegas flights
Seattle to Santa Ana flights
San Francisco to Ontario 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 April 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$52Average$145FlexibilityNo cancel feeOn-time62%
DeltaCheapest$83Average$284FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$98Average$218FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$142Average$313FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$157Average$360FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$161Average$314FlexibilityNo 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
©2026 Cheapflights