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178 € Cheap Flights from Portland to Ontario International

Compare Portland to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Portland to Ontario International

Looking for a cheap last-minute deal or the best return flight from Portland Airport to Ontario International Airport? If you want to travel next month, return fares start from 178 €. Find the lowest prices on one-way and return tickets right here.
Ontario.178 € per passenger.Departing Wed, 5 Aug, returning Wed, 26 Aug.Return flight with Alaska Airlines and Frontier Airlines.Outbound indirect flight with Alaska Airlines, departs from Portland on Wed, 5 Aug, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 26 Aug, arriving in Portland.Price includes taxes and charges.From 178 €, select.
Ontario.183 € per passenger.Departing Thu, 17 Sep, returning Mon, 21 Sep.Return flight with Alaska Airlines and Frontier Airlines.Outbound indirect flight with Alaska Airlines, departs from Portland on Thu, 17 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 21 Sep, arriving in Portland.Price includes taxes and charges.From 183 €, select.
Ontario.184 € per passenger.Departing Wed, 14 Oct, returning Wed, 21 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Wed, 14 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 21 Oct, arriving in Portland.Price includes taxes and charges.From 184 €, select.
Ontario.205 € per passenger.Departing Wed, 30 Sep, returning Mon, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Oct, arriving in Portland.Price includes taxes and charges.From 205 €, select.
Ontario.211 € per passenger.Departing Wed, 28 Oct, returning Wed, 4 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Wed, 28 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 4 Nov, arriving in Portland.Price includes taxes and charges.From 211 €, select.
Ontario.211 € per passenger.Departing Mon, 31 Aug, returning Fri, 11 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Mon, 31 Aug, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 11 Sep, arriving in Portland.Price includes taxes and charges.From 211 €, select.
Ontario.215 € per passenger.Departing Tue, 9 Mar, returning Sat, 13 Mar.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Tue, 9 Mar, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Sat, 13 Mar, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.215 € per passenger.Departing Thu, 5 Nov, returning Sat, 7 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Thu, 5 Nov, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 7 Nov, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.215 € per passenger.Departing Wed, 9 Dec, returning Fri, 11 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Wed, 9 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 11 Dec, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.215 € per passenger.Departing Sun, 17 Jan, returning Sun, 24 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Sun, 17 Jan, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Sun, 24 Jan, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.215 € per passenger.Departing Thu, 15 Apr, returning Thu, 29 Apr.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Thu, 15 Apr, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Thu, 29 Apr, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.215 € per passenger.Departing Fri, 12 Feb, returning Sun, 14 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Fri, 12 Feb, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Sun, 14 Feb, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.215 € per passenger.Departing Thu, 13 May, returning Tue, 18 May.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Thu, 13 May, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Tue, 18 May, arriving in Portland.Price includes taxes and charges.From 215 €, select.
Ontario.234 € per passenger.Departing Fri, 31 Jul, returning Mon, 31 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Fri, 31 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 31 Aug, arriving in Portland.Price includes taxes and charges.From 234 €, select.
Ontario.238 € per passenger.Departing Sat, 22 Aug, returning Sun, 23 Aug.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Portland on Sat, 22 Aug, arriving in Ontario International.Inbound direct flight with Alaska Airlines departs from Ontario International on Sun, 23 Aug, arriving in Portland.Price includes taxes and charges.From 238 €, select.
Ontario.245 € per passenger.Departing Wed, 14 Oct, returning Wed, 21 Oct.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Portland on Wed, 14 Oct, arriving in Ontario International.Inbound direct flight with Alaska Airlines departs from Ontario International on Wed, 21 Oct, arriving in Portland.Price includes taxes and charges.From 245 €, select.

Find the cheapest month to fly from Portland to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Portland to Ontario International flights are currently cheapest in August.
Jul
from 268 €
Aug
from 178 €
Sep
from 183 €
Oct
from 184 €
Nov
from 215 €
Dec
from 215 €
Jan
from 215 €
Feb
from 215 €
Mar
from 215 €
Apr
from 215 €
May
from 215 €
Jun
Find prices

Direct flights from Portland to Ontario International

Portland to Ontario International: Alternative routes

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

Ontario International

4km from central Ontario
Closest
from 178 €
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San Bernardino Norton AFB

39km from central Ontario
from 337 €
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Santa Ana John Wayne

48km from central Ontario
from 202 €
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Long Beach Municipal

54km from central Ontario
from 154 €
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Hawthorne

65km from central Ontario
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Burbank

67km from central Ontario
from 198 €
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Los Angeles International

71km from central Ontario
Cheapest
from 94 €
Search flights

Portland to Ontario: Flight information

The things to know before you go.
Cheapest flight found178 €
Cheapest month to flyAugust
Average flight time2 hrs, 22 mins
Most popular airlineAlaska Airlines
Average flights per week43

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

The best price we found for a return flight from Portland to Ontario International is 178 €. 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 22 minutes is the average flight time from Portland to Ontario International.
Alaska Airlines, Horizon Air and British Airways fly direct from Portland to Ontario International.
As of July 2026, there are 43 flights per week flying from Portland to Ontario International.
The cheapest month to fly from Portland to Ontario International is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Portland Airport to Ontario International Airport on Wednesday, 5 August 2026.
Yes – the average flight time is 2 hours and 22 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 Ontario International 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 Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

Currently, Alaska Airlines offers the cheapest flight tickets to Ontario International.

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

  • Take a direct flight from Portland Airport to Ontario International Airport and you'll be in the air for an average of 2 hours 20 minutes.

  • Ontario's timezone is UTC-8, which is the same as Portland.

  • Each week, there are 19 Portland Airport to Ontario International Airport flights. To get going as soon as possible, opt for the 07:00 Alaska Airlines flight. If you're eager to make the most of your day before you fly, the last flight is at 21:44 with Alaska Airlines.

  • Your PDX to ONT flight won't wait if you're late, so get to the airport with time to spare. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • Flying during a peak month such as July? Public holidays and other high seasons can mean longer lines and delays at security. Play it safe and arrive up to four hours ahead of international flights and two hours before domestic departures.

  • Travelling to Ontario (and then discovering more of the United States!) is a snap with Alaska Airlines. This popular airline has direct flights from Portland Airport to Ontario International Airport.

  • The majority of travellers choose to travel with Alaska Airlines on this route.

  • With a dependable 91.3% of services arriving as scheduled, Frontier Airlines is the most punctual carrier operating PDX to ONT flights.

  • If you want to explore another city along the way, just uncheck 'Direct flights only' when searching for your ticket from Portland Airport to Ontario International Airport. These are the most popular stopovers between PDX and ONT:

    • Harry Reid International Airport

    • San Jose International Airport

    • Oakland Metropolitan Oak Airport

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

  • The lowest price we've seen for a one-way Portland Airport to Ontario International Airport flight is 83 €. A return plane ticket is currently 178 €. Depending on the availability and when you book, these fares can change.

  • It's often best to book ahead of time if you're looking for cheap tickets from PDX to ONT. That's because airlines change prices based on demand, which tends to increase closer to departure.

  • May is the cheapest month for flights from Portland Airport to Ontario International Airport. If you need to travel at a different time of year, the 'Whole month' tool will give you the lowest airfares for every month.

  • Finding cheap flights from PDX to ONT is a piece of cake with Price Alerts. Simply create one of these automatic alerts and we'll let you know when a lower fare pops up.

  • Find the right flight for you with the help of the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Portland Airport to Ontario International Airport, use the 'Sort by' tool. You can also filter by airline, departure and arrival times, and number of stops.

Handy information about Portland Airport (PDX)

  • You'll find PDX at 7000 NE Airport Way.

  • Portland Airport scores high marks for on-time performance. 83% of flights that take off from PDX arrive at their destination on time.

  • To get to Portland Airport from central Portland, it'll take about 20 minutes if you're planning to drive. Of course, this depends on traffic conditions. It's approximately 19 kilometres from the airport to the city centre.

  • Expect a trip time of about 40 minutes when using public transport.

  • Looking for a handy hotel near PDX? If you're boarding an early flight from Portland Airport to Ontario International Airport, these stays will put you moments from your departure lounge:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

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

  • Ontario International Airport to central Ontario has a drive time of around 15 minutes. It's approximately 10 kilometres away.

  • Travelling to the centre on public transport takes around 45 minutes.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from Portland Airport to Ontario International Airport is March, while July is the most popular. Choose the best time to visit Ontario based on whether you prefer a more fast-paced or easygoing experience.

  • Book your flight from Portland Airport to Ontario International Airport for August if you'd like to visit Ontario during its warmest month. You can expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

  • Search for cheap tickets from PDX to ONT in February if you'd rather travel during cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC (39ºF) and 24ºC (75ºF) on average.

Explore more of the United States

  • Los Angeles is just one of the many places in the United States waiting to be discovered once you've seen the sights of Ontario. Around 56 kilometres away to the west, its top attractions include Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

  • If there's time to check out another great destination in the United States, head for San Diego, about 153 kilometres south of Ontario. San Diego Zoo, San Diego Balboa Park and USS Midway Museum are key reasons to visit.

Plan the rest of your trip from Portland to Ontario

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