HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$93+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Aug 30 — Sep 61
Sun 8/30
Sun 9/6
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 July 31, 2026.

This Expedia deal was found by Cheapflights users on 7/30. 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 8/293:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Sat 9/54:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 7/30$177
This Southwest deal was found by Cheapflights users on 7/30. 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.
Sat 8/2911:35 am
BOI
-
ONT
1 stop3h 40m
Southwest
Sat 9/52:55 pm
ONT
-
BOI
1 stop6h 10m
Southwest
Deal found 7/30$187
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2712:24 pm
BOI
-
ONT
1 stop12h 26m
Frontier
Mon 8/3110:49 am
ONT
-
BOI
1 stop24h 40m
Frontier
Deal found 7/29$189
This Flightnetwork deal was found by Cheapflights users on 7/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/293:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Sun 8/304:50 pm
ONT
-
BOI
Nonstop1h 55m
Alaska Airlines
Deal found 7/27$190
This Southwest deal was found by Cheapflights users on 7/30. 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.
Sat 8/297:45 am
BOI
-
ONT
2 stops8h 30m
Southwest
Tue 9/12:10 pm
ONT
-
BOI
2 stops7h 05m
Southwest
Deal found 7/30$197
This Alaska Airlines deal was found by Cheapflights users on 7/27. 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.
Fri 9/183:02 pm
BOI
-
ONT
Nonstop2h 08m
Alaska Airlines
Sun 9/206:02 am
ONT
-
BOI
1 stop5h 33m
Alaska Airlines
Deal found 7/27$207
This Southwest deal was found by Cheapflights users on 7/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/135:40 am
EUG
-
ONT
1 stop4h 40m
Southwest
Mon 8/176:00 am
ONT
-
EUG
1 stop6h 40m
Southwest
Deal found 7/29$237
This Delta deal was found by Cheapflights users on 7/30. 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.
Thu 8/1312:29 pm
EUG
-
ONT
1 stop4h 52m
Delta
Sun 8/166:20 am
ONT
-
EUG
1 stop6h 44m
Delta
Deal found 7/30$247
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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.
Thu 8/203:10 pm
MFR
-
ONT
1 stop5h 14m
Alaska Airlines
Sat 8/297:12 am
ONT
-
MFR
1 stop4h 46m
Alaska Airlines
Deal found 7/28$257
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:03 pm
EUG
-
ONT
1 stop4h 21m
Alaska Airlines
Sun 8/237:12 am
ONT
-
EUG
1 stop5h 36m
Alaska Airlines
Deal found 7/29$257
This Delta deal was found by Cheapflights users on 7/28. 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 8/2612:25 pm
PDX
-
ONT
1 stop4h 56m
Delta
Thu 8/276:01 pm
ONT
-
PDX
1 stop5h 55m
Delta
Deal found 7/28$263
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Tue 8/185:56 pm
PDX
-
ONT
1 stop5h 54m
Frontier
Thu 8/203:40 pm
ONT
-
PDX
1 stop25h 41m
Frontier
Deal found 7/28$265

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 July 31, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(Booking.com)

One-way from

$93
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$288

Good round-trip deal

$297 or less

Good one-way deal

$238 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. 13% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 31, 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

Tue 9/29

3:02 pm-4:10 pm

Nonstop2h 08m

Ontario

Wed 10/21

4:42 pm-7:43 pm

Nonstop2h 01m

$177

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 8/29

11:35 am-2:15 pm

1 stop3h 40m

Ontario

Sat 9/5

2:55 pm-10:05 pm

1 stop6h 10m

$187
Quickest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 11/6

4:48 pm-5:51 pm

Nonstop2h 03m

Ontario

Tue 11/10

5:12 pm-8:12 pm

Nonstop2h 00m

$197

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 8/29

7:45 am-3:15 pm

2 stops8h 30m

Ontario

Tue 9/1

2:10 pm-10:15 pm

2 stops7h 05m

$197

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 10/17

2:02 pm-6:43 pm

1 stop5h 41m

Ontario

Sun 11/1

4:25 pm-11:59 pm

1 stop6h 34m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 10/1

3:02 pm-4:10 pm

Nonstop2h 08m

Ontario

Mon 10/5

6:45 pm-9:46 pm

Nonstop2h 01m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 10/9

7:45 pm-10:15 pm

1 stop3h 30m

Ontario

Tue 10/13

5:45 pm-10:25 pm

1 stop3h 40m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 10/23

4:18 pm-11:42 pm

1 stop8h 24m

Ontario

Fri 11/6

5:12 pm-8:12 pm

Nonstop2h 00m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 9/18

3:02 pm-4:10 pm

Nonstop2h 08m

Ontario

Sun 9/20

6:02 am-12:35 pm

1 stop5h 33m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 11/5

5:49 am-9:43 am

1 stop4h 54m

Ontario

Sun 11/8

5:12 pm-8:12 pm

Nonstop2h 00m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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

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 $207). Flying from Oregon to Ontario in May is currently the most expensive (average of $368). 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 July 31, 2026.

It’s typically best to fly out from Oregon to Ontario in the evening. Doing so could potentially save you 34% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 July 31, 2026.

The most flights from USOR to ONT are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

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

Airfare is typical for this route at the moment.
Oregon to Ontario flights typically cost between $146 and $328 in August.
The cheapest round-trip price found within the last 5 days was $263 on Delta (Aug 26-Sep 7).

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 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 July 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. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 19 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 Alaska Airlines, Southwest, and Delta fly from Oregon to Ontario in about 2h 08m. The time it takes to get you to your destination can typically vary by up to 2h 44m. 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 $55. 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 Boise Air Term. Gowen Fld - Ontario or Eugene - 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 Alaska Airlines (81%), British Airways (78%) or Horizon Air (65%) 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 $208. On average you can expect to pay $383. The most popular route, (Portland - Ontario), can usually be booked for $227.

  • 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 $207). Flying from Oregon to Ontario in May is currently the most expensive (average of $368). 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
Newark to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Newark to Las Vegas flights
Seattle to Los Angeles flights
Dallas/Fort Worth to Las Vegas flights
Seattle to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
Ontario to San Francisco flights
O'Hare Intl to Las Vegas flights
LaGuardia to Los Angeles flights
Hobby to Las Vegas flights
San Francisco to Las Vegas flights
Atlanta to Las Vegas flights
Stewart to San Francisco flights
O'Hare Intl to Los Angeles flights
Los Angeles to Las Vegas flights
Santa Ana to Las Vegas flights
Dulles Intl to Las Vegas flights
John F Kennedy Intl to Ontario flights
San Francisco to Ontario flights
Detroit to Las Vegas flights
Los Angeles to San Francisco flights
George Bush Intcntl to Las Vegas flights
Seattle to Ontario flights
Dallas/Fort Worth to San Francisco flights
San Francisco to Los Angeles flights
Reagan-National to Los Angeles flights
LaGuardia to Las Vegas flights
Boston to Las Vegas flights
Baltimore to Los Angeles flights
Baltimore to Las Vegas flights
Santa Ana to San Francisco flights
Newark to San Diego flights
Hobby to Los Angeles flights
San Francisco to Santa Ana flights
Boston to Los Angeles flights
Seattle to San Francisco flights
Dulles Intl to Los Angeles flights
Denver to Las Vegas flights
Atlanta to Los Angeles flights
San Jose to Las Vegas flights
Reagan-National to Las Vegas flights
O'Hare Intl to San Francisco flights
Boston to San Francisco flights
Orlando to Las Vegas flights
John F Kennedy Intl to San Diego 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 July 31, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$49Average$148FlexibilityNo cancel feeOn-time62%
DeltaCheapest$83Average$330FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$88Average$218FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$142Average$344FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$157Average$379FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$166Average$341FlexibilityNo 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.