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Ontario

$93+ Cheap flights from Portland to Ontario (PDX - 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 1/9. 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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Find cheap flights from Portland 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”

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3. Compare prices and book

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Cheapflights Tip: The best prices from Portland to Ontario are usually found in July or August, booked 47 days in advance, depart on a Friday or Saturday and return on a Friday

Cheap flight deals from Portland to Ontario

Cheapest flights from Portland to Ontario
Explore the most affordable flight options available from Portland 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 CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/182:29 pmPDX - ONT
1 stop26h 40mFrontier
Sun 12/216:00 amONT - PDX
1 stop7h 24mFrontier
Deal found 12/11$303

Find flight deals from Portland to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$161
(Southwest)

One-way from

$93
(American Airlines)

Popular in

March

Cheapest in

July

Average price

$269

Good round-trip deal

$226 or less

Good one-way deal

$139 or less
Provider with most accurate pricing for Portland-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Ontario flights.
Search Deals
From Portland to Ontario
Search Deals
One-way flight from Portland to Ontario
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($73 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($13 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 Portland to Ontario.
Search Deals
Price to beat on a one-way flight from Portland to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland 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 Portland to Ontario that are best for you.

Fly from

Portland

Fly to

Ontario

Route

Depart

Return

Price

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

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

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 1/3

6:05 am-12:15 pm

1 stop6h 10m

Ontario

Thu 1/8

3:20 pm-10:30 pm

1 stop7h 10m

$169

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 1/3

9:38 pm-11:59 pm

Nonstop2h 21m

Ontario

Sat 1/10

5:59 pm-8:26 pm

Nonstop2h 27m

$171

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 2/20

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Mon 2/23

6:08 pm-8:33 pm

Nonstop2h 25m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 3/5

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Thu 3/12

6:08 pm-8:33 pm

Nonstop2h 25m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 1/23

1:24 pm-8:58 pm

1 stop7h 34m

Ontario

Mon 1/26

6:00 am-12:33 pm

1 stop6h 33m

$182

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 21 results
1
2
3

Compare providers for flights from Portland to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ontario in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Portland-Ontario flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Portland-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-Ontario flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to Ontario

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

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to Ontario. Price data was last updated on December 5, 2025.

The price you pay for your flight from Portland to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 47 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Portland to Ontario (average of $45). Flying from Portland 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 PDX to ONT?

Find hourly flight availability from Portland 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.

When flying from Portland to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 36% versus a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Portland to Ontario. Price data was last updated on December 6, 2025.

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

The best insider tips for Portland to Ontario flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip
Airlines
Alaska Airlines

Alaska Airlines offers 32” legroom in Main Cabin, enhancing comfort on short domestic flights.


Alaska Airlines' Wi-Fi is available for a flat fee, ideal for working during flights.

Read more about Alaska AirlinesBy Robert Schrader
Frontier

Frontier's UpFront Plus offers a guaranteed empty middle seat for extra comfort.


Frontier Airlines' Zone 1 boarding is available with carry-on purchase or special fare bundles.

Read more about FrontierBy Marisa Garcia
Airports
PDX

Expect security wait times up to 15 minutes off-peak, longer during rush hours. Use Express Lanes if eligible for faster processing.

Read more about PDXBy Brandon Schultz
ONT

For a convenient arrival, ONT offers rental cars with quick highway access. Stick to on-site companies for ease.

Read more about ONTBy Bill Fink
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Brandon Schultz

Brandon Schultz

Expert on PDX

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated December 12, 2025.
Read through reviews of airlines operating flights from Portland to Ontario, such as Alaska Airlines, Southwest, and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,432 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Alaska Airlines
8.0
Very good
11,432 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Southwest
7.9
Good
4,253 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Delta
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Hawaiian Airlines
7.8
Good
2,817 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.
Frontier
5.8
Fair
3,084 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Nov 2025

PDX - BNA

My family especially liked the leg room and comfortable seats.

Related info for your journey

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

  • What airports do I use to fly from Portland to Ontario?

    You will need to book a flight from Portland to Ontario if you want to fly from Portland to Ontario. At least 6 different airlines have flights from Portland (PDX) to Ontario (ONT) on a regular basis. There are 4 flights to Ontario from the Portland airport per day. If you manage to book one that is nonstop, then you can expect the flight time from PDX to ONT to be around 2h 16m.

  • How popular is this Portland to Ontario flight route?

    Flights from Portland to Ontario have been viewed 39 times in the past calendar month.

  • How long is the flight from Portland to Ontario?

    Airlines like Alaska Airlines and Delta fly from Portland to Ontario in about 2h 22m. The time it takes to get you to your destination can typically vary by up to 4h 36m. Airlines will cover a distance of 839 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Portland to Ontario round-trip?

    Frontier, at $54, was found to be the cheapest airline from Portland to Ontario.Alternate airlines to your destination round-trip include Delta and Hawaiian Airlines. Frontier is priced at 76% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Portland 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 reliable airlines from Portland to Ontario?

    The top 3 most reliable airlines when flying from Portland to Ontario are Frontier (92%), British Airways (91%) and Horizon Air (88%).

  • What are the cheapest flights from Portland to Ontario?

    While on average a flight from Portland to Ontario is generally $320, our data shows the cheapest flight currently is $53. When looking at the most popular route, (Portland - Ontario), you can expect to pay $137 for that flight.

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

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

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

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

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

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

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

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Alternative routes for Portland to Ontario

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Top 6 airlines flying from Portland to Ontario

Discover the top 6 airlines that operate flights from Portland 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$256FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$98Average$238FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$158Average$339FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$167Average$298FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$173Average$275FlexibilityNo cancel feeOn-time63%

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