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$64+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Ontario are usually found in October or July, booked 26 days in advance, depart on a Friday or Saturday and return on a Friday

Cheap 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 September 15, 2025.

Round-trip from

$66
(Kiwi.com)

One-way from

$64
(Frontier)

Popular in

March

Cheapest in

October

Average price

$194

Good round-trip deal

$117 or less

Good one-way deal

$89 or less
From Portland to Ontario
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One-way flight from Portland to Ontario
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Highest demand for flights based on searches. 26% potential increase in price ($81 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Portland to Ontario.
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Price to beat on a one-way flight from Portland to Ontario.
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Find 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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/177:30 pmPDX - ONT
Nonstop2h 22mFrontier
Sun 10/268:25 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/14$66
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/177:30 pmPDX - ONT
Nonstop2h 22mFrontier
Sun 10/198:25 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/14$67
This Mytrip deal was found by Cheapflights users on 9/13. 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.
Fri 10/37:17 pmPDX - ONT
Nonstop2h 21mFrontier
Mon 10/68:07 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/13$68
This Frontier deal was found by Cheapflights users on 9/13. 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 10/127:30 pmPDX - ONT
Nonstop2h 22mFrontier
Mon 10/208:32 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/13$75
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Fri 9/197:17 pmPDX - ONT
Nonstop2h 21mFrontier
Mon 9/228:07 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/13$82
This Frontier deal was found by Cheapflights users on 9/13. 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 9/267:17 pmPDX - ONT
Nonstop2h 21mFrontier
Sun 9/288:07 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/13$83
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 9/227:17 pmPDX - ONT
Nonstop2h 21mFrontier
Mon 9/298:07 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/13$84
This CheapOair deal was found by Cheapflights users on 9/12. 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 11/1712:05 pmONT - PDX
Nonstop2h 26mFrontier
Deal found 9/12$106
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:17 pmPDX - ONT
Nonstop2h 21mFrontier
Wed 10/86:53 amONT - PDX
1 stop28h 45mFrontier
Deal found 9/14$107
This Frontier deal was found by Cheapflights users on 9/13. 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 10/47:15 amPDX - ONT
1 stop12h 39mFrontier
Sun 10/58:07 amONT - PDX
Nonstop2h 26mFrontier
Deal found 9/13$108

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 September 15, 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 10/22

7:25 am-11:15 am

1 stop3h 50m

Ontario

Mon 10/27

3:05 pm-7:40 pm

1 stop4h 35m

$140

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 10/11

5:00 pm-9:20 pm

1 stop4h 20m

Ontario

Tue 10/21

1:15 pm-6:09 pm

1 stop4h 54m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 10/22

9:30 pm-11:51 pm

Nonstop2h 21m

Ontario

Sat 10/25

7:10 am-9:30 am

Nonstop2h 20m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

6:40 am-10:35 am

1 stop3h 55m

Ontario

Sun 12/7

6:25 am-12:05 pm

1 stop5h 40m

$184

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/3

7:00 am-11:55 am

1 stop4h 55m

Ontario

Sun 12/7

6:25 am-12:05 pm

1 stop5h 40m

$184

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 11/6

9:32 pm-11:56 pm

Nonstop2h 24m

Ontario

Sat 11/8

6:03 pm-8:23 pm

Nonstop2h 20m

$187

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 10/9

9:30 pm-11:51 pm

Nonstop2h 21m

Ontario

Tue 10/14

7:10 am-9:30 am

Nonstop2h 20m

$187

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 10/16

9:30 pm-11:51 pm

Nonstop2h 21m

Ontario

Sat 10/18

7:10 am-9:30 am

Nonstop2h 20m

$187

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 10/16

9:30 pm-11:51 pm

Nonstop2h 21m

Ontario

Tue 10/21

5:45 pm-8:03 pm

Nonstop2h 18m

$187

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 11/14

7:37 am-9:58 am

Nonstop2h 21m

Ontario

Sun 11/23

7:00 am-9:27 am

Nonstop2h 27m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 22 results
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The best insider tips for Portland to Ontario flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip
Airlines
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
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
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
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
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
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

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 September 12, 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 26 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, August is the cheapest month in which you can book a flight from Portland to Ontario (average of $246). Flying from Portland to Ontario in March is currently the most expensive (average of $328). 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 September 15, 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 33% 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 September 14, 2025.

Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Saturday at noon 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.

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 September 15, 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
10,000 reviews

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,954 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Hawaiian Airlines
7.8
Good
2,723 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,172 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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 6 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 10m.

  • How popular is this Portland to Ontario flight route?

    Flights from Portland to Ontario have been viewed 62 times in the past calendar month.

  • How long is the flight from Portland to Ontario?

    Airlines like Southwest, Delta, and Hawaiian Airlines fly from Portland to Ontario in about 2h 21m. The time it takes to get you to your destination can typically vary by up to 1h 59m. 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 $64, 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 71% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from Portland to Ontario?

    The top 3 most reliable airlines when flying from Portland to Ontario are Alaska Airlines (85%), Hawaiian Airlines (85%) and British Airways (85%).

  • What are the cheapest flights from Portland to Ontario?

    While on average a flight from Portland to Ontario is generally $162, our data shows the cheapest flight currently is $49. When looking at the most popular route, (Portland - Ontario), you can expect to pay $67 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, August is the cheapest month in which you can book a flight from Portland to Ontario (average of $246). Flying from Portland to Ontario in March is currently the most expensive (average of $328). 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$142FlexibilityNo cancel feeOn-time62%
DeltaCheapest$93Average$316FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$98Average$243FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$158Average$341FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$161Average$290FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$173Average$286FlexibilityNo cancel feeOn-time63%

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