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$70+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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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 December 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/319:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Mon 1/57:19 pmONT - PDX
1 stop4h 53mAlaska Airlines
Deal found 12/10$217
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 12/2512:47 pmPDX - ONT
1 stop11h 12mFrontier
Mon 12/296:00 pmONT - PDX
1 stop19h 24mFrontier
Deal found 12/10$221
This Alaska Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/319:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Thu 1/17:00 amONT - PDX
Nonstop2h 29mAlaska Airlines
Deal found 12/10$237
This Frontier deal was found by Cheapflights users on 12/10. 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.
Thu 12/2512:47 pmPDX - ONT
1 stop11h 12mFrontier
Tue 12/306:00 amONT - PDX
1 stop7h 24mFrontier
Deal found 12/10$238
This Southwest deal was found by Cheapflights users on 12/11. 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.
Mon 12/298:00 pmPDX - ONT
1 stop3h 55mSouthwest
Fri 1/26:50 pmONT - PDX
1 stop4h 15mSouthwest
Deal found 12/11$261
This Kiwi.com deal was found by Cheapflights users on 12/10. 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.
Wed 12/243:59 pmPDX - ONT
2 stops25h 23mFrontier
Thu 1/810:18 pmONT - PDX
1 stop11h 16mFrontier
Deal found 12/10$266
This Alaska Airlines deal was found by Cheapflights users on 12/10. 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.
Wed 12/319:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Sun 1/47:00 amONT - PDX
Nonstop2h 29mAlaska Airlines
Deal found 12/10$267
This Expedia deal was found by Cheapflights users on 12/10. 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.
Wed 12/249:38 pmPDX - ONT
Nonstop2h 21mMultiple Airlines
Thu 1/810:18 pmONT - PDX
1 stop11h 16mMultiple Airlines
Deal found 12/10$275
This Southwest deal was found by Cheapflights users on 12/10. 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 12/2412:05 pmPDX - ONT
1 stop4h 45mSouthwest
Thu 1/86:05 amONT - PDX
1 stop5h 40mSouthwest
Deal found 12/10$292
This Frontier deal was found by Cheapflights users on 12/11. 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.
Thu 12/182:29 pmPDX - ONT
1 stop6h 48mFrontier
Tue 12/236:00 amONT - PDX
1 stop7h 24mFrontier
Deal found 12/11$293
This Expedia deal was found by Cheapflights users on 12/10. 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.
Wed 12/249:38 pmPDX - ONT
Nonstop2h 21mAlaska Airlines
Thu 1/87:00 amONT - PDX
Nonstop2h 33mAlaska Airlines
Deal found 12/10$297
This Southwest deal was found by Cheapflights users on 12/10. 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.
Tue 12/308:45 pmBOI - ONT
1 stop4h 10mSouthwest
Mon 1/55:55 pmONT - BOI
1 stop4h 20mSouthwest
Deal found 12/10$302

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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$137
(Alaska Airlines)

One-way from

$70
(Frontier)

Popular in

November

Cheapest in

January

Average price

$237

Good round-trip deal

$226 or less

Good one-way deal

$139 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. 12% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 2025.
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 1/17

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Tue 1/20

7:56 pm-10:57 pm

Nonstop2h 01m

$137

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 1/17

6:15 pm-9:48 pm

1 stop4h 33m

Ontario

Tue 1/20

5:10 pm-11:12 pm

1 stop5h 02m

$147

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 1/24

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Mon 1/26

7:56 pm-10:57 pm

Nonstop2h 01m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 2/18

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Tue 2/24

6:14 am-10:46 am

1 stop4h 32m

$162

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 1/17

2:43 pm-5:03 pm

Nonstop2h 20m

Ontario

Sun 1/18

6:00 am-12:38 pm

1 stop6h 38m

$162

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 1/22

1:38 pm-11:56 pm

1 stop10h 18m

Ontario

Tue 1/27

5:59 pm-8:26 pm

Nonstop2h 27m

$162

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 1/14

2:43 pm-5:03 pm

Nonstop2h 20m

Ontario

Sun 1/18

6:00 am-12:38 pm

1 stop6h 38m

$162

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sun 1/11

5:55 pm-3:08 pm

1 stop22h 13m

Ontario

Sat 1/17

7:56 pm-10:57 pm

Nonstop2h 01m

$162

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 1/6

6:00 pm-12:14 am

1 stop7h 14m

Ontario

Tue 1/13

7:56 pm-10:57 pm

Nonstop2h 01m

$162

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 1/28

5:00 pm-11:58 pm

1 stop6h 58m

Ontario

Thu 1/29

5:10 pm-11:55 pm

1 stop6h 45m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 60 results
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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, January is the cheapest month in which you can book a flight from Oregon to Ontario (average of $45). 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 December 12, 2025.

It’s typically best to fly out from Oregon to Ontario in the afternoon. Doing so could potentially save you 17% on the flight price compared to flying at noon, 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 December 16, 2024.

Travelers seeking maximum savings on their Oregon to Ontario flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday at noon 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 December 12, 2025.

The most flights from USOR to ONT are scheduled on a Wednesday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 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 39 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 and Delta fly from Oregon to Ontario in about 2h 07m. The time it takes to get you to your destination can typically vary by up to 2h 26m. 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 $39. Users have also found prices from $87 and $88 on Southwest and Alaska 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 Frontier (92%), British Airways (91%) or Horizon Air (88%) 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 $53. On average you can expect to pay $320. The most popular route, (Portland - Ontario), can usually be booked for $129.

  • 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, January is the cheapest month in which you can book a flight from Oregon to Ontario (average of $45). 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.

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Alternative routes for Oregon to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$150FlexibilityNo cancel feeOn-time62%
DeltaCheapest$83Average$301FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$98Average$238FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$158Average$349FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$167Average$341FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$173Average$304FlexibilityNo cancel feeOn-time63%

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