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$61+ 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 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Oregon to Ontario

Keep the following information in mind while searching for Oregon to Ontario flight deals. Data was last updated October 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$116
(Frontier)

One-way from

$61
(Frontier)

Popular in

November

Cheapest in

January

Average price

$199

Good round-trip deal

$177 or less

Good one-way deal

$117 or less
Provider with most accurate pricing for Portland-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Portland-Los Angeles flights.
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From Oregon to Ontario
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One-way flight from Oregon to Ontario
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Highest demand for flights based on searches. 9% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Oregon to Ontario.
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Price to beat on a one-way flight from Oregon to Ontario.
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Find 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 October 30, 2025.

This Frontier deal was found by Cheapflights users on 10/29. 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.
Sat 11/1512:52 pmPDX - ONT
1 stop10h 58mFrontier
Sun 11/1612:05 pmONT - PDX
Nonstop2h 26mFrontier
Deal found 10/29$116
This Frontier deal was found by Cheapflights users on 10/29. 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.
Thu 12/182:19 pmPDX - ONT
Nonstop2h 10mFrontier
Tue 12/236:17 pmONT - PDX
Nonstop2h 22mFrontier
Deal found 10/29$121
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 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
Thu 1/16:00 amONT - PDX
1 stop7h 24mFrontier
Deal found 10/28$123
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/181:26 pmPDX - ONT
1 stop8h 01mFrontier
Mon 11/2412:29 pmONT - PDX
Nonstop2h 35mFrontier
Deal found 10/30$125
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/149:02 pmPDX - ONT
2 stops15h 35mFrontier
Sun 11/1612:05 pmONT - PDX
Nonstop2h 26mFrontier
Deal found 10/30$127
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/212:19 pmPDX - ONT
Nonstop2h 10mFrontier
Tue 12/306:17 pmONT - PDX
Nonstop2h 22mFrontier
Deal found 10/30$129
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1512:52 pmPDX - ONT
1 stop10h 58mFrontier
Mon 11/176:53 amONT - PDX
1 stop29h 03mFrontier
Deal found 10/29$130
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:33 pmBOI - ONT
1 stop23h 37mFrontier
Sat 11/156:53 amONT - BOI
1 stop27h 50mFrontier
Deal found 10/30$136
This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1212:55 pmPDX - ONT
1 stop25h 30mFrontier
Sun 12/146:15 amONT - PDX
1 stop26h 21mFrontier
Deal found 10/30$141
This CheapOair deal was found by Cheapflights users on 10/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:26 pmPDX - ONT
1 stop8h 24mFrontier
Sat 11/156:53 amONT - PDX
1 stop29h 03mFrontier
Deal found 10/29$143
This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/143:26 pmPDX - ONT
1 stop8h 24mFrontier
Mon 11/176:53 amONT - PDX
1 stop29h 03mFrontier
Deal found 10/30$144
This Delta deal was found by Cheapflights users on 10/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/28:45 amBOI - ONT
1 stop4h 49mDelta
Tue 12/96:40 amONT - BOI
1 stop8h 22mDelta
Deal found 10/29$147

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 October 30, 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

Mon 1/5

9:46 pm-8:13 pm

1 stop23h 27m

Ontario

Sun 1/11

6:00 am-11:59 am

1 stop28h 59m

$145

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 3/7

5:45 pm-9:52 pm

1 stop5h 07m

Ontario

Wed 3/11

11:55 am-6:25 pm

1 stop5h 30m

$147

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 2/10

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Sun 2/22

6:22 pm-9:39 pm

Nonstop2h 17m

$157

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 1/10

6:09 pm-7:16 pm

Nonstop2h 07m

Ontario

Mon 1/12

7:56 pm-10:57 pm

Nonstop2h 01m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 1/24

3:52 pm-10:53 pm

1 stop7h 01m

Ontario

Mon 1/26

6:00 am-12:33 pm

1 stop6h 33m

$167

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 12/6

11:44 am-5:08 pm

1 stop6h 24m

Ontario

Mon 12/8

12:40 pm-8:20 pm

1 stop6h 40m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 2/19

2:35 pm-4:53 pm

Nonstop2h 18m

Ontario

Wed 2/25

7:00 am-9:24 am

Nonstop2h 24m

$167

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 1/5

5:10 pm-10:29 pm

1 stop6h 19m

Ontario

Sat 1/10

7:30 am-4:22 pm

1 stop7h 52m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

10:30 am-12:46 pm

Nonstop2h 16m

Ontario

Sat 12/6

7:10 am-9:41 am

Nonstop2h 31m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/10

6:40 am-1:15 pm

1 stop6h 35m

Ontario

Thu 12/11

5:55 am-10:50 am

1 stop4h 55m

$172

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

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 $48). Flying from Oregon to Ontario in June is currently the most expensive (average of $83). 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 October 30, 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.

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 38 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 United Airlines 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 4h 54m. 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 Southwest. According to our data, you can fly for as low as $84. Users have also found prices from $88 and $149 on Alaska Airlines and Delta, 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 British Airways (100%), Alaska Airlines (85%) or Hawaiian Airlines (82%) 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 $81. On average you can expect to pay $342. The most popular route, (Portland - Ontario), can usually be booked for $133.

  • 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 $48). Flying from Oregon to Ontario in June is currently the most expensive (average of $83). 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

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$65Average$149FlexibilityNo cancel feeOn-time62%
DeltaCheapest$93Average$331FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$98Average$238FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$158Average$343FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$168Average$342FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$173Average$312FlexibilityNo cancel feeOn-time63%

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