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Cheap flights from Ontario to Portland from $70

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 2/4. 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.
Alaska Airlines Logo
7:00 am - 9:28 am
ONT
-
PDX
2h 28mnonstop
Alaska Airlines Logo
2:48 pm - 5:09 pm
PDX
-
ONT
2h 21mnonstop
$157Alaska Airlines
Sat, Mar 21 - Tue, Apr 14
Frontier Logo
7:35 pm - 10:14 am
ONT
-
PDX
14h 39m
1 stop
Frontier Logo
9:22 pm - 1:52 pm
PDX
-
ONT
16h 30m
1 stop
$161Frontier
Sat, Feb 7 - Mon, Feb 9
Southwest Logo
6:10 pm - 12:55 am
ONT
-
PDX
6h 45m
2 stops
Southwest Logo
5:30 pm - 10:15 pm
PDX
-
ONT
4h 45m
1 stop
$162Southwest
Sat, Mar 7 - Tue, Mar 10
Delta Logo
3:30 pm - 8:59 pm
ONT
-
PDX
5h 29m
1 stop
Delta Logo
5:25 pm - 9:44 pm
PDX
-
ONT
4h 19m
1 stop
$167Delta
Wed, Feb 11 - Sat, Feb 14
Southwest Logo
6:10 pm - 12:55 am
ONT
-
PDX
6h 45m
2 stops
Southwest Logo
9:30 am - 4:30 pm
PDX
-
ONT
7h 00m
2 stops
$168Southwest
Sat, Mar 7 - Tue, Mar 10
Frontier Logo
3:07 pm - 10:33 am
ONT
-
PDX
19h 26m
1 stop
Frontier Logo
9:22 pm - 1:37 pm
PDX
-
ONT
16h 15m
1 stop
$171Frontier
Wed, Jan 28 - Mon, Feb 2
Southwest Logo
4:05 pm - 11:55 pm
ONT
-
PDX
7h 50m
2 stops
Southwest Logo
7:10 am - 12:15 pm
PDX
-
ONT
5h 05m
1 stop
$172Southwest
Sat, Feb 28 - Mon, Mar 2
United Airlines Logo
6:00 am - 12:33 pm
ONT
-
PDX
6h 33m
1 stop
United Airlines Logo
5:05 am - 12:43 pm
PDX
-
ONT
7h 38m
1 stop
$173United Airlines
Wed, Feb 11 - Sun, Feb 15
Southwest Logo
4:05 pm - 10:05 pm
ONT
-
PDX
6h 00m
1 stop
Southwest Logo
6:00 am - 12:25 pm
PDX
-
ONT
6h 25m
1 stop
$174Southwest
Thu, Feb 19 - Tue, Feb 24
Delta Logo
1:10 pm - 6:16 pm
ONT
-
PDX
5h 06m
1 stop
Delta Logo
7:11 pm - 11:49 pm
PDX
-
ONT
4h 38m
1 stop
$177Delta
Tue, Feb 24 - Wed, Feb 25

Alaska Airlines flights from Ontario to Portland

Our best Alaska Airlines deals on Ontario to Portland flight tickets
Alaska Airlines
Mar 21
ONT5:49 pmOntario
2h 27m
PDX8:16 pmPortland
Mar 24
PDX5:58 pmPortland
2h 25m
ONT8:23 pmOntario
$157
Alaska Airlines
Mar 18
ONT6:00 amOntario
6h 35m
1 stop
PDX12:35 pmPortland
Mar 25
PDX5:58 pmPortland
2h 25m
ONT8:23 pmOntario
$187
Alaska Airlines
Feb 24
ONT7:00 amOntario
2h 28m
PDX9:28 amPortland
Feb 28
PDX2:45 pmPortland
4h 12m
1 stop
ONT6:57 pmOntario
$190

Southwest flights from Ontario to Portland

Our best Southwest deals on Ontario to Portland flight tickets
Southwest
Mar 7
ONT6:10 pmOntario
6h 45m
2 stops
PDX12:55 amPortland
Mar 10
PDX5:30 pmPortland
4h 45m
1 stop
ONT10:15 pmOntario
$162
Southwest
Mar 7
ONT6:10 pmOntario
6h 45m
2 stops
PDX12:55 amPortland
Mar 10
PDX9:30 amPortland
7h 00m
2 stops
ONT4:30 pmOntario
$168
Southwest
Feb 28
ONT4:05 pmOntario
7h 50m
2 stops
PDX11:55 pmPortland
Mar 2
PDX7:10 amPortland
5h 05m
1 stop
ONT12:15 pmOntario
$172

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 January 15, 2026.
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

Sat 3/21

7:00 am-9:28 am

Nonstop2h 28m

Portland

Tue 4/14

2:48 pm-5:09 pm

Nonstop2h 21m

$157

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 2/7

7:35 pm-10:14 am

1 stop14h 39m

Portland

Mon 2/9

9:22 pm-1:52 pm

1 stop16h 30m

$161

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 3/7

6:10 pm-12:55 am

2 stops6h 45m

Portland

Tue 3/10

5:30 pm-10:15 pm

1 stop4h 45m

$162

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 2/11

3:30 pm-8:59 pm

1 stop5h 29m

Portland

Sat 2/14

5:25 pm-9:44 pm

1 stop4h 19m

$167

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 3/7

6:10 pm-12:55 am

2 stops6h 45m

Portland

Tue 3/10

9:30 am-4:30 pm

2 stops7h 00m

$168

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 1/28

3:07 pm-10:33 am

1 stop19h 26m

Portland

Mon 2/2

9:22 pm-1:37 pm

1 stop16h 15m

$171

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 2/28

4:05 pm-11:55 pm

2 stops7h 50m

Portland

Mon 3/2

7:10 am-12:15 pm

1 stop5h 05m

$172

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 2/11

6:00 am-12:33 pm

1 stop6h 33m

Portland

Sun 2/15

5:05 am-12:43 pm

1 stop7h 38m

$173

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 2/19

4:05 pm-10:05 pm

1 stop6h 00m

Portland

Tue 2/24

6:00 am-12:25 pm

1 stop6h 25m

$174

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 2/24

1:10 pm-6:16 pm

1 stop5h 06m

Portland

Wed 2/25

7:11 pm-11:49 pm

1 stop4h 38m

$177

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 July. Flight prices, which tend to average around $182, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in July, 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 $203. 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 $245.

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

The cheapest time of day to fly to Portland is in the afternoon when flights can be purchased for as low as $205. In the evening is when there is more demand to fly to Portland, so prices are often more expensive at around $241 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 $217 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 $177 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.

Can stopping save me money on Ontario to Portland flights?

No. A direct flight is the cheapest option for a flight between Ontario to Portland.

How have Ontario to Portland flight prices changed over time?

As of January 2026, prices for Ontario to Portland flights are approximately 41% more expensive 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

$218

Fastest flight time

2h 17m

Direct flights

Every day

Airports in Portland

1 airport
The best one-way flight to Portland from Ontario in the past 72 hours is $218. The best round-trip flight deal from Ontario to Portland found on momondo in the last 72 hours is $187.
The fastest flight from Ontario to Portland takes 2h 17m
Direct flights go from Ontario to Portland every day.
There is 1 airport in Portland. From Ontario there are direct flights to 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 17m.

  • 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 $73Free CancellationRating
5.7
3,057 reviews
Search Frontier flights
DeltaPriceFrom $78Free CancellationRating
7.9
8,049 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $88Free CancellationRating
7.8
2,827 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $153Free CancellationRating
7.4
9,164 reviews
Search United Airlines flights
SouthwestPriceFrom $158Free CancellationRating
8.0
4,258 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $164Free CancellationRating
8.0
11,719 reviews
Search Alaska Airlines flights

  • Alaska Airlines Flights From Ontario to Portland

    Alaska Airlines operates around 9 flights from Ontario to Portland every week. The average price of these flights found in the last 72 hours has been $273, but momondo users have found Alaska Airlines deals from Ontario to Portland from as low as $164 round-trip. Alaska Airlines has been scored 8.0/10 in 11,719 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 $215. Hawaiian Airlines operates 19 flights to Portland from Ontario in an average week. Users have rated it 7.8/10 across 2,827 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
Longview
Gresham
Tigard
Pacific City
The Dalles
Manzanita
Newberg

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

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