ONT - PWM

$149 Find Cheap Flights from Ontario to Portland - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Portland departing on 8/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Portland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Portland, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Portland, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$265
Typical prices: $397-$407
JetBlue
Tue 8/18Fri 8/28
ONT - PWM • 1 stop
Cheapest one-way
$149
Typical prices: $148-$267
Delta
Fri 8/28
ONT - PWM • 1 stop
Top airlines
Cheapest • from $265 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Portland. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $258 (round-trip)
Shortest trip • 7h 41m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Portland!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Portland (ONT-PWM)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Portland that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Portland

Tue, Aug 18 - Fri, Aug 28
JetBlue Logo
11:59 pm - 1:45 pm
ONT
-
PWM
10h 46m
1 stop
JetBlue Logo
2:45 pm - 10:38 pm
PWM
-
ONT
10h 53m
1 stop
$265JetBlue
Mon, Aug 17 - Fri, Aug 28
JetBlue Logo
11:59 pm - 12:30 pm
ONT
-
PWM
9h 31m
1 stop
JetBlue Logo
2:45 pm - 10:38 pm
PWM
-
ONT
10h 53m
1 stop
$296JetBlue
Tue, Aug 11 - Wed, Aug 19
United Airlines Logo
7:00 am - 11:32 pm
ONT
-
PWM
13h 32m
2 stops
United Airlines Logo
5:03 pm - 10:35 pm
PWM
-
ONT
8h 32m
1 stop
$302United Airlines
Sat, Aug 15 - Sat, Aug 22
American Airlines Logo
7:05 am - 10:48 pm
ONT
-
PWM
12h 43m
2 stops
American Airlines Logo
7:28 am - 6:15 pm
PWM
-
ONT
13h 47m
2 stops
$307American Airlines
Mon, Aug 17 - Sat, Aug 29
JetBlue Logo
11:59 pm - 12:30 pm
ONT
-
PWM
9h 31m
1 stop
JetBlue Logo
2:40 pm - 9:59 pm
PWM
-
ONT
10h 19m
1 stop
$327JetBlue
Tue, Aug 11 - Wed, Aug 19
American Airlines Logo
6:00 am - 6:52 pm
ONT
-
PWM
9h 52m
1 stop
American Airlines Logo
8:00 am - 1:31 pm
PWM
-
ONT
8h 31m
1 stop
$339American Airlines
Tue, Aug 11 - Wed, Aug 19
American Airlines Logo
6:00 am - 9:21 pm
ONT
-
PWM
12h 21m
2 stops
American Airlines Logo
7:28 am - 6:15 pm
PWM
-
ONT
13h 47m
2 stops
$342American Airlines
Sun, Aug 16 - Thu, Aug 27
JetBlue Logo
11:59 pm - 12:30 pm
ONT
-
PWM
9h 31m
1 stop
JetBlue Logo
2:40 pm - 10:38 pm
PWM
-
ONT
10h 58m
1 stop
$346JetBlue
Tue, Sep 22 - Wed, Sep 30
Delta Logo
12:17 pm - 11:30 pm
ONT
-
PWM
8h 13m
1 stop
Delta Logo
6:00 am - 11:07 am
PWM
-
ONT
8h 07m
1 stop
$351Delta
Sun, Sep 20 - Wed, Sep 30
Delta Logo
10:00 pm - 3:39 pm
ONT
-
PWM
14h 39m
2 stops
Delta Logo
6:00 am - 11:07 am
PWM
-
ONT
8h 07m
1 stop
$356Delta
Booking Insights

KAYAK's insights & trends for Ontario to Portland flights

Get data-powered insights and trends into flights from Ontario to Portland to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ontario to Portland, Maine?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Portland, Maine departing in August.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Portland, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Portland is January, where tickets cost $0 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $814 and $662 respectively.

Good to know

Low seasonOctober
Cheapest flight$149
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from Ontario to Portland

When to book flights from Ontario to Portland

Are your dates flexible? Find out the best times to travel from Ontario to Portland based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Portland

  • What is the cheapest flight from Ontario to Portland?

    In the last 5 days, the lowest price for a flight from Ontario to Portland was $149 for a one-way ticket and $265 for a round-trip.

  • Do I need a passport to fly between Ontario and Portland?

    No

  • Which aircraft models fly most regularly from Ontario to Portland?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Portland?

    oneworld, and Star Alliance are the airline alliances operating flights between Ontario and Portland, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Portland, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Portland are Southwest and United Airlines. With an average price for the route of $613 and an overall rating of 7.9, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $457 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Ontario to Portland?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Portland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Portland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portland from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Portland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Portland with an airline and back to Ontario with another airline. Booking your flights between Ontario and PWM can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Portland?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Portland from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ontario to Portland

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Portland. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Portland? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4246 reviews
8.1Boarding
8.6Crew
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

10.0 ExcellentK, Jun 2026
SAN - AUS
Read more Southwest reviews

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

Service was professional and quick. Premium economy seat was comfortable given the class

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Over 2.5 hour maintenance delay on first morning flight with no acknowledgement, compensation or even gesture of good will. Aircraft had overnighted at airport so issue should have been addressed prior to boarding. Over 3.5 hours before first slow and deliberate beverage service.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

My wallet fell out of my pocket ( my fault). Staff claimed they looked while cleaning. Said they didn't find it, but was actually found in Washington DC on the plane. Which mean either they didn't look or don't do a good job of cleaning. Now I have to pay 27 dollars to get it shipped back and have no wallet for my entire vacation

Flight was delayed multiple times without giving any particular reason and the only thing that was communicated was that 'Aircraft is getting ready'. I was stuck at SFO airport for 15 hours and finally took Southwest Airlines flight back home to Dallas.

I was not clear if food was offered or not.

Agency very bad had to cancelled my booking too many changes in the flight changed my flight to 1 week

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

The flight was on time and arrived early. The crew were friendly and helpful.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

90 min delay for a food cart that needed to be fixed.

Everything you need to know for your flight from Ontario to Portland

Information on your arrival and departure airports