How popular is this Portland to Ontario flight route?

Flights from Portland to Ontario have been viewed 51 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 21m. The time it takes to get you to your destination can typically vary by up to 3h 43m. 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 $65, 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 70% lower than the current average price of a flight leaving 3 months from now.

Weekly flight availability from Portland to Ontario

The most flights from PDX to ONT are scheduled on a Wednesday (8 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

What are the cheapest flights from Portland to Ontario?

While on average a flight from Portland to Ontario is generally $278, our data shows the cheapest flight currently is $49. When looking at the most popular route, (Portland - Ontario), you can expect to pay $92 for that flight.

What are the most reliable airlines from Portland to Ontario?

The top 3 most reliable airlines when flying from Portland to Ontario are British Airways (100%), Alaska Airlines (85%) and Hawaiian Airlines (82%).

What are the most popular airlines that fly from Portland to Ontario?

The most popular airlines flying from Portland to Ontario are Frontier, Alaska Airlines and Southwest. Something to consider prior to booking your flight.

Most accurate provider : When it comes to deals on Portland-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

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 15m.

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.

$67+ Flights from Portland to Ontario

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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”

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.

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

Cheap flight deals from Portland to Ontario

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$91 (Kiwi.com)
One-way from	$67 (Kiwi.com)
Popular in	March
Cheapest in	October
Average price	$161
Good round-trip deal	$138 or less
Good one-way deal	$89 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. 25% potential increase in price ($77 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease ($14 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 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

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 October 16, 2025.

Fri 11/712:51 pmPDX - ONT

Nonstop2h 19mFrontier

Mon 11/1012:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/16

$91

Sun 12/212:19 pmPDX - ONT

Nonstop2h 10mFrontier

Thu 12/256:17 pmONT - PDX

Nonstop2h 22mFrontier

Deal found 10/15

$101

Fri 11/712:51 pmPDX - ONT

Nonstop2h 19mFrontier

Sun 11/912:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/15

$102

Mon 12/89:31 amPDX - ONT

1 stop11h 46mFrontier

Thu 12/186:15 amONT - PDX

1 stop7h 09mFrontier

Deal found 10/15

$106

Sat 11/1512:52 pmPDX - ONT

1 stop10h 58mFrontier

Sun 11/1612:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/15

$108

Tue 10/2812:52 pmPDX - ONT

1 stop10h 58mFrontier

Mon 11/312:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/14

$114

Fri 10/313:26 pmPDX - ONT

1 stop8h 24mFrontier

Mon 11/312:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/13

$116

Best flights from Portland to Ontario
Discover carefully curated flight deals from Portland to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 16, 2025.

Sat 12/209:38 pmPDX - ONT

Nonstop2h 21mAlaska Airlines

Tue 1/67:00 amONT - PDX

Nonstop2h 29mAlaska Airlines

Deal found 10/14

$157

Wed 1/1410:15 amPDX - ONT

1 stop6h 04mDelta

Wed 1/214:00 pmONT - PDX

1 stop4h 47mDelta

Deal found 10/13

$157

Tue 1/132:43 pmPDX - ONT

Nonstop2h 22mAlaska Airlines

Sat 1/171:46 pmONT - PDX

Nonstop2h 34mAlaska Airlines

Deal found 10/13

$157

Sun 11/165:05 pmPDX - ONT

1 stop6h 47mDelta

Mon 11/174:49 pmONT - PDX

1 stop7h 09mDelta

Deal found 10/15

$177

Sat 12/209:38 pmPDX - ONT

Nonstop2h 21mAlaska Airlines

Thu 1/87:00 amONT - PDX

Nonstop2h 33mAlaska Airlines

Deal found 10/14

$167

Wed 12/249:38 pmPDX - ONT

Nonstop2h 21mAlaska Airlines

Fri 1/97:00 amONT - PDX

Nonstop2h 33mAlaska Airlines

Deal found 10/14

$167

Wed 1/1410:46 amPDX - ONT

Nonstop2h 20mAlaska Airlines

Thu 1/225:59 pmONT - PDX

Nonstop2h 27mAlaska Airlines

Deal found 10/13

$167

Wed 12/249:38 pmPDX - ONT

Nonstop2h 21mAlaska Airlines

Thu 1/81:46 pmONT - PDX

Nonstop2h 34mAlaska Airlines

Deal found 10/14

$167

Sun 12/219:38 pmPDX - ONT

Nonstop2h 21mAlaska Airlines

Tue 1/67:00 amONT - PDX

Nonstop2h 29mAlaska Airlines

Deal found 10/14

$167

Sat 12/65:45 pmPDX - ONT

Nonstop2h 18mAlaska Airlines

Mon 12/86:00 amONT - PDX

1 stop4h 50mAlaska Airlines

Deal found 10/15

$172

Fri 12/125:45 pmPDX - ONT

Nonstop2h 18mAlaska Airlines

Mon 12/157:10 amONT - PDX

Nonstop2h 31mAlaska Airlines

Deal found 10/14

$177

Thu 1/810:46 amPDX - ONT

Nonstop2h 20mAlaska Airlines

Sun 1/117:00 amONT - PDX

Nonstop2h 33mAlaska Airlines

Deal found 10/14

$177

Last-minute flights from Portland to Ontario
Discover last-minute flight deals from Portland to Ontario. Data last updated October 16, 2025 and is based on user searches.

Fri 10/313:26 pmPDX - ONT

1 stop19h 44mFrontier

Mon 11/312:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/15

$118

Thu 11/612:52 pmPDX - ONT

1 stop10h 58mFrontier

Mon 11/1012:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/15

$129

Fri 11/712:51 pmPDX - ONT

Nonstop2h 19mFrontier

Mon 11/1012:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/16

$91

Fri 11/712:51 pmPDX - ONT

Nonstop2h 19mFrontier

Sun 11/912:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/15

$102

Sun 11/912:51 pmPDX - ONT

Nonstop2h 19mFrontier

Fri 11/146:53 amONT - PDX

1 stop29h 03mFrontier

Deal found 10/15

$126

Sat 11/1512:52 pmPDX - ONT

1 stop10h 58mFrontier

Sun 11/1612:05 pmONT - PDX

Nonstop2h 26mFrontier

Deal found 10/15

$108

One-way flights from Portland to Ontario
Search for one-way flight options from Portland to Ontario. Find affordable one-way fares based on user searches. Data last updated October 16, 2025.

Mon 11/173:26 pmPDX - ONT

1 stop30h 01mFrontier

Deal found 10/15

$67

Wed 10/223:41 pmPDX - ONT

1 stop8h 09mFrontier

Deal found 10/15

$74

Fri 10/313:26 pmPDX - ONT

1 stop8h 24mFrontier

Deal found 10/15

$75

Sat 11/151:38 pmPDX - ONT

1 stop7h 15mAlaska Airlines

Deal found 10/15

$78

Sat 12/1310:05 amPDX - ONT

1 stop6h 04mDelta

Deal found 10/16

$79

Mon 12/89:31 amPDX - ONT

1 stop4h 33mFrontier

Deal found 10/15

$80

Sat 10/2512:43 pmPDX - ONT

1 stop11h 07mFrontier

Deal found 10/15

$81

Wed 11/57:00 amPDX - ONT

2 stops8h 20mSouthwest

Deal found 10/15

$84

Thu 11/612:52 pmPDX - ONT

1 stop10h 58mFrontier

Deal found 10/16

$85

Sat 12/131:34 pmPDX - ONT

1 stop4h 59mAlaska Airlines

Deal found 10/16

$88

Thu 11/66:10 amPDX - ONT

1 stop5h 50mSouthwest

Deal found 10/15

$89

Mon 10/2712:43 pmPDX - ONT

1 stop11h 07mFrontier

Deal found 10/15

$94

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 12/20

9:38 pm-11:59 pm

Nonstop2h 21m

Ontario

Tue 1/6

7:00 am-9:29 am

Nonstop2h 29m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 1/14

10:15 am-4:19 pm

1 stop6h 04m

Ontario

Wed 1/21

4:00 pm-8:47 pm

1 stop4h 47m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 1/13

2:43 pm-5:05 pm

Nonstop2h 22m

Ontario

Sat 1/17

1:46 pm-4:20 pm

Nonstop2h 34m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 12/20

9:38 pm-11:59 pm

Nonstop2h 21m

Ontario

Thu 1/8

7:00 am-9:33 am

Nonstop2h 33m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/24

9:38 pm-11:59 pm

Nonstop2h 21m

Ontario

Fri 1/9

7:00 am-9:33 am

Nonstop2h 33m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 1/14

10:46 am-1:06 pm

Nonstop2h 20m

Ontario

Thu 1/22

5:59 pm-8:26 pm

Nonstop2h 27m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/24

9:38 pm-11:59 pm

Nonstop2h 21m

Ontario

Thu 1/8

1:46 pm-4:20 pm

Nonstop2h 34m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 12/21

9:38 pm-11:59 pm

Nonstop2h 21m

Ontario

Tue 1/6

7:00 am-9:29 am

Nonstop2h 29m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 12/6

5:45 pm-8:03 pm

Nonstop2h 18m

Ontario

Mon 12/8

6:00 am-10:50 am

1 stop4h 50m

$172

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 11/16

5:05 pm-11:52 pm

1 stop6h 47m

Ontario

Mon 11/17

4:49 pm-11:58 pm

1 stop7h 09m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/16

Showing 1-10 of 24 results

Compare providers for flights from Portland to Ontario

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Ontario in October.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy2 stars	Trust Score*1 star
Priceline	Price Accuracy1 star	Trust Score*3 stars
JustAirTicket	Price Accuracy-	Trust Score*3 stars
Kiwi.com	Price Accuracy3 stars	Trust Score*3 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Mytrip	Price Accuracy2 stars	Trust Score*3 stars
Cheapfaremart	Price Accuracy-	Trust Score*1 star

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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

Prices

Airlines

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

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 $50). Flying from Portland to Ontario in July is currently the most expensive (average of $89). 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?

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 37% versus a flight at noon.

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

Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Friday mornings 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.

The best insider tips for Portland to Ontario flights

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.

ONT

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

Our travel experts

Marisa Garcia

Expert on Frontier

Robert Schrader

Expert on Alaska Airlines

Bill Fink

Expert on ONT

Brandon Schultz

Expert on PDX

Reviews of airlines servicing Ontario

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

11,103 reviews

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

11,103 reviews

Alaska Airlines

8.0

Very good

11,103 reviews

Reviews

1 / 20

6.0

Good

Hannah,Aug 2025

SFO - SAN

Southwest

8.0

Very good

4,241 reviews

Alaska Airlines

8.0

Very good

11,103 reviews

Reviews

1 / 20

6.0

Good

Hannah,Aug 2025

SFO - SAN

Delta

7.9

Good

7,980 reviews

Alaska Airlines

8.0

Very good

11,103 reviews

Reviews

1 / 20

6.0

Good

Hannah,Aug 2025

SFO - SAN

Hawaiian Airlines

7.8

Good

2,781 reviews

Alaska Airlines

8.0

Very good

11,103 reviews

Reviews

1 / 20

6.0

Good

Hannah,Aug 2025

SFO - SAN

Frontier

5.8

Fair

3,137 reviews

Alaska Airlines

8.0

Very good

11,103 reviews

Reviews

1 / 20

6.0

Good

Hannah,Aug 2025

SFO - SAN

Related info for your journey

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 15m.
How popular is this Portland to Ontario flight route?
Flights from Portland to Ontario have been viewed 51 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 21m. The time it takes to get you to your destination can typically vary by up to 3h 43m. 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 $65, 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 70% 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 British Airways (100%), Alaska Airlines (85%) and Hawaiian Airlines (82%).
What are the cheapest flights from Portland to Ontario?
While on average a flight from Portland to Ontario is generally $278, our data shows the cheapest flight currently is $49. When looking at the most popular route, (Portland - Ontario), you can expect to pay $92 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 $50). Flying from Portland to Ontario in July is currently the most expensive (average of $89). 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

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Other flights to Ontario

Top 6 airlines flying from Portland to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$65	Average$147	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$93	Average$277	FlexibilityNo cancel fee	On-timeN/A
Hawaiian Airlines	Cheapest$98	Average$238	FlexibilityNo cancel fee	On-time85%
United Airlines	Cheapest$158	Average$341	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$166	Average$298	FlexibilityNo cancel fee	On-time75%
Southwest	Cheapest$173	Average$283	FlexibilityNo cancel fee	On-time63%

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$67+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Portland to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Cheap flight deals from Portland to Ontario

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Portland to Ontario

Cheapest flights from Portland to OntarioExplore 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 October 16, 2025.

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 October 16, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portland to Ontario that are best for you.

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 October.

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.

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?

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

What is the cheapest time of day to fly from PDX to ONT?

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

Weekly flight availability from Portland to Ontario

The best insider tips for Portland to Ontario flights

Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip

Airlines

Frontier

Alaska Airlines

Airports

PDX

ONT

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Reviews of airlines servicing Ontario

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.

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?

How popular is this Portland to Ontario flight route?

How long is the flight from Portland to Ontario?

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

What are the most reliable airlines from Portland to Ontario?

What are the cheapest flights from Portland to Ontario?

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

How can I find direct flights from Portland to Ontario?

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

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

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Alternative routes for Portland to Ontario

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Top 6 airlines flying from Portland to Ontario

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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 October 16, 2025.