ONT - PWM

$154 Find Cheap Flights from Ontario to Portland

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 1/30. 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
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Everything you should know

Cheapest round-trip
$284
American Airlines
Sat 1/31Sun 2/1
ONT - PWM • 2 stops
Cheapest one-way
$154
Delta
Fri 1/30
ONT - PWM • 2 stops
Top airlines
Delta
Cheapest • from $307 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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

Sat, Jan 31 - Sun, Feb 1
American Airlines Logo
6:00 am - 9:37 pm
ONT
-
PWM
12h 37m2 stops
American Airlines Logo
6:00 am - 5:22 pm
PWM
-
ONT
14h 22m2 stops
$284American Airlines
Mon, Feb 2 - Mon, Feb 9
Delta Logo
10:30 pm - 12:03 pm
ONT
-
PWM
10h 33m2 stops
Delta Logo
12:10 pm - 9:05 pm
PWM
-
ONT
11h 55m2 stops
$307Delta
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
6:10 am - 11:20 pm
ONT
-
PWM
14h 10m2 stops
United Airlines Logo
6:00 am - 5:41 pm
PWM
-
ONT
14h 41m2 stops
$415United Airlines
Sat, May 30 - Sat, Jun 6
United Airlines Logo
6:30 pm - 8:19 am
ONT
-
PWM
10h 49m2 stops
United Airlines Logo
4:48 pm - 10:26 pm
PWM
-
ONT
8h 38m1 stop
$463United Airlines
Wed, Jun 10 - Wed, Jun 17
Delta Logo
7:00 am - 6:01 pm
ONT
-
PWM
8h 01m1 stop
Delta Logo
1:35 pm - 10:09 pm
PWM
-
ONT
11h 34m1 stop
$499Delta
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
6:10 am - 11:20 pm
ONT
-
PWM
14h 10m2 stops
United Airlines Logo
6:00 am - 5:41 pm
PWM
-
ONT
14h 41m3 stops
$524United Airlines
Wed, Jun 3 - Wed, Jun 10
United Airlines Logo
5:00 am - 9:27 pm
ONT
-
PWM
13h 27m2 stops
United Airlines Logo
4:48 pm - 10:26 pm
PWM
-
ONT
8h 38m1 stop
$537United Airlines
Tue, Feb 3 - Tue, Feb 10
United Airlines Logo
8:00 am - 2:31 pm
ONT
-
PWM
27h 31m2 stops
United Airlines Logo
11:12 am - 8:58 pm
PWM
-
ONT
12h 46m2 stops
$558United Airlines
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
6:10 am - 11:20 pm
ONT
-
PWM
14h 10m2 stops
United Airlines Logo
6:00 am - 5:41 pm
PWM
-
ONT
14h 41m3 stops
$578United Airlines
Wed, Mar 18 - Tue, Mar 24
United Airlines Logo
6:00 am - 10:51 pm
ONT
-
PWM
13h 51m2 stops
United Airlines Logo
4:23 pm - 10:25 pm
PWM
-
ONT
9h 02m1 stop
$582United Airlines
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.

Which airlines provide the cheapest flights from Ontario to Portland?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Ontario to Portland were found on Delta ($307) and United Airlines ($415).

Which airlines fly non-stop between Ontario and Portland?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Ontario to Portland.

There are 4 airlines that fly nonstop from Ontario to Portland. They are: American Airlines, Delta, Southwest and United Airlines. The cheapest price of all airlines flying this route was found with Delta at $148 for a round-trip flight. On average, the best prices for this route can be found at Delta.

Good to know

Low seasonApril
Cheapest flight$154
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly and prices are also 1% 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 3 days, the lowest price for a flight from Ontario to Portland was $154 for a one-way ticket and $284 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?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Portland are Southwest and Delta. With an average price for the route of $618 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $338 and an overall rating of 7.9.

  • 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 4 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.
8.0
SouthwestOverall score based on 4252 reviews
7.5Entertainment
8.0Comfort
7.0Food
8.6Crew
8.1Boarding
Airline reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

8.0 ExcellentRussell, Dec 2025
SAN - OAK
Read more Southwest reviews

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

Premium Plus is a really good idea for longer flights

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

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

Information on your arrival and departure airports