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Cheap flights from Ontario to Portland from $55

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Portland departing on 1/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Portland

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
4:40 pm - 8:30 pm
ONT
-
PDX
3h 50m1 stop
Southwest Logo
7:25 am - 1:50 pm
PDX
-
ONT
6h 25m2 stops
$160Southwest
Mon, Jan 12 - Wed, Jan 14
Alaska Airlines Logo
11:53 am - 10:46 pm
ONT
-
PDX
10h 53m1 stop
Alaska Airlines Logo
2:43 pm - 5:03 pm
PDX
-
ONT
2h 20mnonstop
$161Alaska Airlines
Mon, Jan 12 - Sat, Jan 17
Southwest Logo
3:30 pm - 10:30 pm
ONT
-
PDX
7h 00m1 stop
Southwest Logo
5:50 am - 11:25 am
PDX
-
ONT
5h 35m1 stop
$162Southwest
Wed, Dec 24 - Mon, Dec 29
Frontier Logo
3:22 pm - 9:49 am
ONT
-
PDX
18h 27m1 stop
Frontier Logo
9:22 pm - 1:37 pm
PDX
-
ONT
16h 15m1 stop
$163Frontier
Thu, Jan 29 - Mon, Feb 2
Frontier Logo
6:00 am - 1:24 pm
ONT
-
PDX
7h 24m1 stop
Frontier Logo
2:19 pm - 9:17 pm
PDX
-
ONT
6h 58m1 stop
$164Frontier
Tue, Dec 23 - Thu, Jan 1
Multiple Airlines Logo
7:35 pm - 10:14 am
ONT
-
PDX
14h 39m1 stop
Multiple Airlines Logo
2:43 pm - 5:03 pm
PDX
-
ONT
2h 20mnonstop
$165Multiple Airlines
Sat, Jan 24 - Sat, Jan 31
Delta Logo
5:07 pm - 10:54 pm
ONT
-
PDX
5h 47m1 stop
Delta Logo
5:50 am - 12:16 pm
PDX
-
ONT
6h 26m1 stop
$166Delta
Thu, Jan 8 - Sun, Jan 11
Alaska Airlines Logo
1:46 pm - 4:20 pm
ONT
-
PDX
2h 34mnonstop
Alaska Airlines Logo
2:43 pm - 5:03 pm
PDX
-
ONT
2h 20mnonstop
$167Alaska Airlines
Sat, Jan 17 - Mon, Jan 19
Delta Logo
3:30 pm - 8:59 pm
ONT
-
PDX
5h 29m1 stop
Delta Logo
9:20 am - 1:56 pm
PDX
-
ONT
4h 36m1 stop
$168Delta
Sun, Feb 8 - Tue, Feb 10
Alaska Airlines Logo
7:00 am - 9:33 am
ONT
-
PDX
2h 33mnonstop
Alaska Airlines Logo
9:40 pm - 7:16 pm
PDX
-
ONT
21h 36m1 stop
$170Alaska Airlines
Wed, Jan 14 - Fri, Jan 16

Frontier flights from Ontario to Portland

Our best Frontier deals on Ontario to Portland flight tickets
Frontier
Jan 29
ONT3:22 pmOntario
18h 27m
1 stop
PDX9:49 amPortland
Feb 2
PDX9:22 pmPortland
16h 15m
1 stop
ONT1:37 pmOntario
$163
Find similar
Frontier
Dec 23
ONT6:00 amOntario
7h 24m
1 stop
PDX1:24 pmPortland
Jan 1
PDX2:19 pmPortland
6h 58m
1 stop
ONT9:17 pmOntario
$164
Find similar
Frontier
Dec 23
ONT6:00 amOntario
7h 24m
1 stop
PDX1:24 pmPortland
Dec 25
PDX12:47 pmPortland
11h 12m
1 stop
ONT11:59 pmOntario
$188
Find similar

Delta flights from Ontario to Portland

Our best Delta deals on Ontario to Portland flight tickets
Delta
Jan 8
ONT5:07 pmOntario
5h 47m
1 stop
PDX10:54 pmPortland
Jan 11
PDX5:50 amPortland
6h 26m
1 stop
ONT12:16 pmOntario
$166
Find similar
Delta
Feb 8
ONT3:30 pmOntario
5h 29m
1 stop
PDX8:59 pmPortland
Feb 10
PDX9:20 amPortland
4h 36m
1 stop
ONT1:56 pmOntario
$168
Find similar
Delta
Jan 29
ONT1:10 pmOntario
7h 49m
2 stops
PDX8:59 pmPortland
Feb 2
PDX5:15 pmPortland
5h 29m
1 stop
ONT10:44 pmOntario
$172
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Portland 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, momondo users made 832,500 searches. Data last updated December 4, 2025.
Use the filters below to find and compare flights from Ontario to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 1/12

4:40 pm-8:30 pm

1 stop3h 50m

Portland

Wed 1/14

7:25 am-1:50 pm

2 stops6h 25m

$160

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 1/12

11:53 am-10:46 pm

1 stop10h 53m

Portland

Sat 1/17

2:43 pm-5:03 pm

Nonstop2h 20m

$161

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 12/24

3:30 pm-10:30 pm

1 stop7h 00m

Portland

Mon 12/29

5:50 am-11:25 am

1 stop5h 35m

$162

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 1/29

3:22 pm-9:49 am

1 stop18h 27m

Portland

Mon 2/2

9:22 pm-1:37 pm

1 stop16h 15m

$163

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 12/23

6:00 am-1:24 pm

1 stop7h 24m

Portland

Thu 1/1

2:19 pm-9:17 pm

1 stop6h 58m

$164

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 1/24

7:35 pm-10:14 am

1 stop14h 39m

Portland

Sat 1/31

2:43 pm-5:03 pm

Nonstop2h 20m

$165

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 1/8

5:07 pm-10:54 pm

1 stop5h 47m

Portland

Sun 1/11

5:50 am-12:16 pm

1 stop6h 26m

$166

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 1/17

1:46 pm-4:20 pm

Nonstop2h 34m

Portland

Mon 1/19

2:43 pm-5:03 pm

Nonstop2h 20m

$167

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sun 2/8

3:30 pm-8:59 pm

1 stop5h 29m

Portland

Tue 2/10

9:20 am-1:56 pm

1 stop4h 36m

$168

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 1/14

7:00 am-9:33 am

Nonstop2h 33m

Portland

Fri 1/16

9:40 pm-7:16 pm

1 stop21h 36m

$170

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portland from

How to get the cheapest flight ticket from Ontario to Portland

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portland?

The cheapest month to fly to Portland from Ontario is in January. Flight prices, which tend to average around $177, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in January, then you should wait until October to fly from Ontario, when ticket prices are also cheap, with an average price of $182.

What is the cheapest day to depart on your flight to Portland?

The cheapest day to depart on your flight to Portland is on a Saturday when prices can be found for as low as $200. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Portland is Wednesday, with ticket prices averaging around $243.

What is the cheapest time of day to depart on your flight to Portland?

The cheapest time of day to fly to Portland is at noon when flights can be purchased for as low as $198. In the evening is when there is more demand to fly to Portland, so prices are often more expensive at around $250 per ticket.

What is the cheapest Ontario to Portland flight route?

Fly from Ontario to Portland for the best Ontario - Portland flight prices

How far in advance should I book a flight to Portland?

You are more likely to see cheaper flights to Portland from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $215 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from Ontario for as low as $178 on momondo.

What cabin class options are available on Ontario to Portland flights?

There are 4 cabin classes available to choose from on Ontario to Portland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Ontario to Portland flight prices changed over time?

As of December 2025, prices for Ontario to Portland flights are approximately 42% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Portland

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Portland according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Portland (ONT to PDX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Portland

Best Price Found

$109

Fastest flight time

2h 22m

Direct flights

Every day

Airports in Portland

1 airport
The best one-way flight to Portland from Ontario in the past 72 hours is $109. The best round-trip flight deal from Ontario to Portland found on momondo in the last 72 hours is $193.
The fastest flight from Ontario to Portland takes 2h 22m
Direct flights go from Ontario to Portland every day.
There is 1 airport near Portland: Portland (PDX)
Search flight deals

  • How far is Ontario to Portland by plane?

    Ontario and Portland are 834.5 mi apart from one another. A reasonable flight in good conditions will take 2h 24m.

  • When did momondo last update prices for flights from Ontario Airport to Portland Airport?

    Prices for flights from Ontario Airport to Portland Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Portland Airport?

  • How old do you have to be to fly from Ontario Airport to Portland Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Portland Airport.

  • What documentation or ID do you need to fly to Portland Airport?

    The required travel and health documents for your Portland Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Portland Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Ontario to Portland?

  • What is the most popular airline from Ontario to Portland?

Best airlines flying from Ontario to Portland

Compare and see reviews for airlines that fly from Ontario to Portland with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $77Free CancellationRating
5.8
3,092 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $88Free CancellationRating
7.8
2,817 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $137Free CancellationRating
7.9
8,010 reviews
Search Delta flights
United AirlinesPriceFrom $153Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $166Free CancellationRating
8.0
11,402 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $166Free CancellationRating
8.0
4,251 reviews
Search Southwest flights

  • Alaska Airlines Flights From Ontario to Portland

    Alaska Airlines operates around 8 flights from Ontario to Portland every week. The average price of these flights found in the last 72 hours has been $272, but momondo users have found Alaska Airlines deals from Ontario to Portland from as low as $166 round-trip. Alaska Airlines has been scored 8.0/10 in 11,402 reviews.

  • Hawaiian Airlines Flights From Ontario to Portland

    Hawaiian Airlines is also a popular choice for this route. Hawaiian Airlines flight deals for Ontario to Portland start from as low as $88 round-trip, depending on your selected dates, with average Hawaiian Airlines deals seen on momondo around $247. Hawaiian Airlines operates 15 flights to Portland from Ontario in an average week. Users have rated it 7.8/10 across 2,817 reviews.

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Lincoln City
Seaside
Cannon Beach
Vancouver
Salem
Astoria
Long Beach
Depoe Bay
Rockaway Beach
Beaverton
Hillsboro
Hood River
McMinnville
Gresham
Longview
Tigard
The Dalles
Pacific City
Manzanita
Tillamook

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Portland?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Portland. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Portland with flexible booking policies on momondo?

Yes. All flights to Portland from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to Portland?

Once you have performed a search for Ontario to Portland flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to Portland right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Ontario to Portland now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Portland and let you know when they change.

An easier way to manage your Portland trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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