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Cheap Flights from Ontario (ONT) to Portland (PDX)

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      Travellers and cabin class, 1 Adult, Economy
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      Compare Ontario International to Portland flight deals

      Find the cheapest month or even day of the year to fly to Portland

      Book the best Portland fare with no extra fees

      Flight deals from Ontario International to Portland

      Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Portland Airport? If you want to travel next month, return fares start from $251. Find the lowest prices on one-way and return tickets right here.
      Portland.$201 per passenger.Departing Thu, 12 Nov, returning Mon, 16 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 12 Nov, arriving in Portland.Inbound indirect flight with Frontier Airlines, departs from Portland on Mon, 16 Nov, arriving in Ontario International.Price includes taxes and charges.From $201, select.
      Portland.$251 per passenger.Departing Thu, 10 Sep, returning Thu, 17 Sep.Return flight with Frontier Airlines and Alaska Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 10 Sep, arriving in Portland.Inbound indirect flight with Alaska Airlines, departs from Portland on Thu, 17 Sep, arriving in Ontario International.Price includes taxes and charges.From $251, select.
      Portland.$262 per passenger.Departing Thu, 1 Oct, returning Thu, 8 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 1 Oct, arriving in Portland.Inbound indirect flight with Frontier Airlines, departs from Portland on Thu, 8 Oct, arriving in Ontario International.Price includes taxes and charges.From $262, select.
      Portland.$334 per passenger.Departing Wed, 7 Oct, returning Fri, 6 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 7 Oct, arriving in Portland.Inbound indirect flight with Frontier Airlines, departs from Portland on Fri, 6 Nov, arriving in Ontario International.Price includes taxes and charges.From $334, select.
      Portland.$347 per passenger.Departing Wed, 23 Sep, returning Sat, 26 Sep.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Wed, 23 Sep, arriving in Portland.Inbound direct flight with Alaska Airlines departs from Portland on Sat, 26 Sep, arriving in Ontario International.Price includes taxes and charges.From $347, select.
      Portland.$347 per passenger.Departing Tue, 6 Oct, returning Sat, 10 Oct.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Tue, 6 Oct, arriving in Portland.Inbound direct flight with Alaska Airlines departs from Portland on Sat, 10 Oct, arriving in Ontario International.Price includes taxes and charges.From $347, select.
      Portland.$366 per passenger.Departing Fri, 4 Dec, returning Sun, 6 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 4 Dec, arriving in Portland.Inbound indirect flight with Frontier Airlines, departs from Portland on Sun, 6 Dec, arriving in Ontario International.Price includes taxes and charges.From $366, select.
      Portland.$366 per passenger.Departing Tue, 29 Sep, returning Tue, 6 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 29 Sep, arriving in Portland.Inbound indirect flight with Southwest Airlines, departs from Portland on Tue, 6 Oct, arriving in Ontario International.Price includes taxes and charges.From $366, select.
      Portland.$372 per passenger.Departing Tue, 5 Jan, returning Wed, 6 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 5 Jan, arriving in Portland.Inbound indirect flight with Southwest Airlines, departs from Portland on Wed, 6 Jan, arriving in Ontario International.Price includes taxes and charges.From $372, select.
      Portland.$387 per passenger.Departing Wed, 17 Feb, returning Wed, 24 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Wed, 17 Feb, arriving in Portland.Inbound indirect flight with Delta, departs from Portland on Wed, 24 Feb, arriving in Ontario International.Price includes taxes and charges.From $387, select.
      Portland.$403 per passenger.Departing Fri, 23 Apr, returning Wed, 28 Apr.Return flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Fri, 23 Apr, arriving in Portland.Inbound indirect flight with Delta, departs from Portland on Wed, 28 Apr, arriving in Ontario International.Price includes taxes and charges.From $403, select.
      Portland.$409 per passenger.Departing Sat, 16 Jan, returning Sat, 23 Jan.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Ontario International on Sat, 16 Jan, arriving in Portland.Inbound direct flight with Alaska Airlines departs from Portland on Sat, 23 Jan, arriving in Ontario International.Price includes taxes and charges.From $409, select.
      Portland.$422 per passenger.Departing Thu, 26 Nov, returning Tue, 1 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 26 Nov, arriving in Portland.Inbound indirect flight with Southwest Airlines, departs from Portland on Tue, 1 Dec, arriving in Ontario International.Price includes taxes and charges.From $422, select.
      Portland.$432 per passenger.Departing Thu, 28 Jan, returning Tue, 2 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 28 Jan, arriving in Portland.Inbound indirect flight with Southwest Airlines, departs from Portland on Tue, 2 Feb, arriving in Ontario International.Price includes taxes and charges.From $432, select.
      Portland.$450 per passenger.Departing Tue, 29 Dec, returning Tue, 5 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 29 Dec, arriving in Portland.Inbound indirect flight with Southwest Airlines, departs from Portland on Tue, 5 Jan, arriving in Ontario International.Price includes taxes and charges.From $450, select.
      Portland.$456 per passenger.Departing Sun, 30 Aug, returning Sat, 5 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 30 Aug, arriving in Portland.Inbound indirect flight with Southwest Airlines, departs from Portland on Sat, 5 Sep, arriving in Ontario International.Price includes taxes and charges.From $456, select.

      Find the cheapest month to fly from Ontario International to Portland

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Portland flights are currently cheapest in November.
      Aug
      from $489
      Sep
      from $251
      Oct
      from $262
      Nov
      from $201
      Dec
      from $366
      Jan
      from $372
      Feb
      from $387
      Mar
      from $472
      Apr
      from $403
      May
      Find prices
      Jun
      Find prices
      Jul
      Find prices

      Direct flights from Ontario International to Portland

      Alaska Airlines
      British Airways
      Frontier Airlines
      Volaris

      Ontario International to Portland: Alternative routes

      Compare routes from Ontario International to Portland below. You may find an airport to fly into that's cheaper, faster, or easier than Portland.

      Portland

      10km from central Portland
      ClosestCheapest
      from $201
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      Ontario to Portland: Flight information

      The things to know before you go.
      Cheapest flight found$201
      Cheapest month to flyNovember
      Average flight time2 hrs, 21 mins
      Most popular airlineAlaska Airlines
      Average flights per week32

      Finding cheap flights from Ontario International to Portland: Frequently asked questions

      The best price we found for a return flight from Ontario International to Portland is $201. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      2 hours and 21 minutes is the average flight time from Ontario International to Portland.
      Alaska Airlines, British Airways and Frontier Airlines fly direct from Ontario International to Portland.
      As of August 2026, there are 32 flights per week flying from Ontario International to Portland.
      The cheapest month to fly from Ontario International to Portland is usually November.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Portland Airport on Thursday, 12 November 2026.
      Yes – the average flight time is 2 hours and 21 minutes.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Portland but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Portland is around 40 days in advance, so don’t leave your flight to the last minute.

      Currently, Frontier Airlines and Alaska Airlines offer the cheapest flight tickets to Portland.

      Flying from Ontario International Airport (ONT) to Portland Airport (PDX): what you need to know

      • Around 2 hours 20 minutes is how long you can expect to be in the air on a direct flight from Ontario International Airport to Portland Airport.

      • Ontario and Portland share the same timezone, UTC-8.

      • Flights from ONT to PDX start from 06:55 — the first with Alaska Airlines. The last service of the day is at 20:59 with Alaska Airlines. In total, you can take your pick of 19 weekly Ontario International Airport to Portland Airport flights.

      • Arrive at the airport on time so you don't miss your ONT to PDX flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid any last-minute rush.

      • During popular months such as July, it's best to get to the airport earlier. Arrive two hours before domestic departures and four hours ahead for an international flight whenever you're flying during a peak period in general.

      • Flying into Portland (and then seeing more of the United States!) is a breeze with Alaska Airlines. This popular airline offers direct flights from Ontario International Airport to Portland Airport.

      • The airline most travellers fly with on this route is Alaska Airlines.

      • With a reliable 86.62% of services arriving as planned, Alaska Airlines has the best on-time record for ONT to PDX flights.

      • We make it simple to book a flight with a stopover. To see your options for tickets from Ontario International Airport to Portland Airport, uncheck 'Direct flights only.' Then, choose a flight with a stop long enough to explore your chosen city. Stopovers between ONT and PDX include:

        • San Francisco International Airport

        • San Jose International Airport

        • Oakland Metropolitan Oak Airport

      How to find the cheapest flights from Ontario International Airport (ONT) to Portland Airport (PDX)

      • Right now, $123 is the lowest price we've seen for a one-way Ontario International Airport to Portland Airport flight. The best price for a return plane ticket is $201. Remember that fares could change due to demand at the time of booking.

      • To pick up cheap tickets from ONT to PDX, book your journey one month before your departure date.

      • June is the cheapest month for flights from Ontario International Airport to Portland Airport. If you prefer to travel during a different time of year, the 'Whole month' tool will give you the lowest prices across every month.

      • Landing cheap flights from ONT to PDX is a piece of cake with Price Alerts. All you need to do is set up one of these automatic alerts and we'll get in touch as soon as a new deal comes up.

      • Tailor your trip using filters. Pick your preferred arrival and departure times, airlines and total journey duration. You can also sort the results by 'Fastest,' 'Cheapest' or 'Best' flights from Ontario International Airport to Portland Airport.

      Handy information about Ontario International Airport (ONT)

      • You'll find ONT at 2900 E. Airport Drive.

      • 83% of flights departing from Ontario International Airport touch down at their destination on time. Given its strong on-time stats, delays are unlikely when flying out of ONT.

      • To reach Ontario International Airport from central Ontario, it'll take around 15 minutes if you're going by car. Of course, this depends on traffic conditions. It's approximately 10 kilometres from the airport to the city centre.

      • Taking public transport? You can expect a journey time of around 45 minutes.

      • Get your break off to a leisurely start by staying near ONT. Whether you're boarding an early flight from Ontario International Airport to Portland Airport or just don't like being rushed, these stays are ideal:

      Arriving at Portland Airport (PDX)

      When to fly to Portland Airport (PDX)

      • July is the most popular month for flights from Ontario International Airport to Portland Airport. For a quieter experience, visit Portland in March.

      • Book your flight from Ontario International Airport to Portland Airport for August if you'd like to go to Portland during its warmest month. You can expect temperatures of between 12ºC (54ºF) and 31ºC (88ºF).

      • If you'd rather travel in cooler conditions, look for a cheap ticket from ONT to PDX in January. Temperatures average between -2ºC (28ºF) and 10ºC (50ºF) then.

      Explore more of the United States

      • You've seen Portland, now it's time to discover more of the United States. Travel about 241 kilometres north to Seattle to tick off its leading sights. From Space Needle to Pike Place Market and Seattle Skyline, you'll have a full itinerary ahead.

      • Spokane is another standout destination in the United States and is around 467 kilometres north-east of Portland. No trip is complete without dropping by Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.

      Plan smart, explore more

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      Plan the rest of your trip from Ontario to Portland

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.