Cheap Flights from Portland to Ontario International from $264

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 to Ontario International? Find the lowest prices on one-way and return tickets right here.

Ontario.$264 per passenger.Departing Tue, 17 Mar, returning Tue, 24 Mar.Return flight with Hawaiian Airlines.Outbound direct flight with Hawaiian Airlines departs from Portland on Tue, 17 Mar, arriving in Ontario International.Inbound direct flight with Hawaiian Airlines departs from Ontario International on Tue, 24 Mar, arriving in Portland.Price includes taxes and charges.From $264, select.

Ontario.$266 per passenger.Departing Thu, 23 Apr, returning Mon, 27 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Thu, 23 Apr, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 27 Apr, arriving in Portland.Price includes taxes and charges.From $266, select.

Ontario.$274 per passenger.Departing Thu, 19 Feb, returning Mon, 23 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Thu, 19 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 23 Feb, arriving in Portland.Price includes taxes and charges.From $274, select.

Ontario.$274 per passenger.Departing Wed, 4 Mar, returning Fri, 10 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Wed, 4 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 10 Apr, arriving in Portland.Price includes taxes and charges.From $274, select.

Ontario.$275 per passenger.Departing Thu, 7 May, returning Sun, 10 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Thu, 7 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 10 May, arriving in Portland.Price includes taxes and charges.From $275, select.

Ontario.$275 per passenger.Departing Mon, 27 Apr, returning Sat, 2 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Mon, 27 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 2 May, arriving in Portland.Price includes taxes and charges.From $275, select.

Ontario.$276 per passenger.Departing Sun, 22 Feb, returning Mon, 2 Mar.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Sun, 22 Feb, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Mon, 2 Mar, arriving in Portland.Price includes taxes and charges.From $276, select.

Ontario.$276 per passenger.Departing Tue, 17 Mar, returning Wed, 20 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Tue, 17 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 20 May, arriving in Portland.Price includes taxes and charges.From $276, 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 March.

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Jan

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.

Portland to Ontario: Flight information

The things to know before you go.

Cheapest flight found	$264
Cheapest month to fly	March
Average flight time	2 hrs, 21 mins
Most popular airline	Alaska Airlines
Average flights per week	46

Check out these Ontario International hotels

Ready to plan your stay? Other travellers rate these Ontario International hotels for cleanliness, service and location.

Studio 6 Ontario CA Convention Center Airport

1.02 km from Ontario International

$131

Per night

Delta Hotels Ontario Airport

0.74 km from Ontario International

$170

Per night

Azure Hotel&Suites Ontario Trademark Collection by Wyndham

0.78 km from Ontario International

$172

Per night

Studio 6 Ontario CA Convention Center Airport

1.02 km from Ontario International

$131

Per night

Delta Hotels Ontario Airport

0.74 km from Ontario International

$170

Per night

Azure Hotel&Suites Ontario Trademark Collection by Wyndham

0.78 km from Ontario International

$172

Per night

Explore top-rated hotels

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

How much are return flights from Portland to Ontario International?

The best price we found for a return flight from Portland to Ontario International is $264. 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.

How long does it take to fly from Portland to Ontario International?

2 hours and 21 minutes is the average flight time from Portland to Ontario International.

Which airlines fly direct from Portland to Ontario International?

Alaska Airlines, Horizon Air and Hawaiian Airlines fly direct from Portland to Ontario International.

How many flights are there a week from Portland to Ontario International?

As of February 2026, there are 46 flights per week flying from Portland to Ontario International.

When is the cheapest time to fly from Portland to Ontario International?

The cheapest month to fly from Portland to Ontario International is usually March.

Which upcoming date is cheapest to fly from Portland Airport to Ontario International Airport on?

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 Tuesday, 17 March 2026.

Can I get a direct flight from Portland Airport to Ontario International Airport?

Yes – the average flight time is 2 hours and 21 minutes.

How can I find the best flight deal to Ontario International?

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.

When is the best time to book flights to Ontario?

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.

Which is the cheapest airline to fly from Portland Airport to Ontario International with?

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

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

Book a direct flight from Portland International Airport to Ontario International Airport and you'll be travelling for an average of 2 hours 20 minutes.
Ontario's timezone is UTC-7, which is the same as Portland.
Each week, there are 52 Portland International Airport to Ontario International Airport flights. If you want to get going as early as possible, take the 07:50 Alaska Airlines flight. If you're eager to make the most of your time before flying, the last departure is at 20:55 with Alaska Airlines.
For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This will give you enough time to board your PDX to ONT flight.
Travelling during a peak month such as July? Public holidays and other popular seasons can lead to longer queues at security. Play it safe and arrive up to four hours before an international flight and two hours before a domestic departure.
With direct flights from Portland International Airport to Ontario International Airport available through various airlines, flying to Ontario (and then other parts of United States) is a breeze. Here's who you can travel nonstop with:
The airline that serves the most passengers on this route is Alaska Airlines.
Frontier Airlines leads the way as the most punctual carrier for PDX to ONT flights, with 91.3% of services arriving on schedule.
If you want to break up your flight, simply uncheck 'Direct flights only' when searching for your ticket from Portland International Airport to Ontario International Airport. These are the most popular stopovers between PDX and ONT:
- Norman Y. Mineta San Jose International Airport
- Metropolitan Oakland International Airport
- Harry Reid Airport (formerly McCarran Airport)

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

The cheapest price we've found for a one-way Portland International Airport to Ontario International Airport flight is $137. A round-trip plane ticket is currently $264. Depending on the availability and when you book, these fares can change.
Get cheap tickets from PDX to ONT by booking six months ahead. According to our research, that's the sweet spot for picking up a bargain.
May is the cheapest month for flights from Portland International Airport to Ontario International Airport. If you prefer to travel during a different time of year, the 'Whole month' tool will show you the lowest airfares for every month.
You don't need to check every day to find out if fares have gone down when you set up a Price Alert. We'll send you an update the moment the price changes on cheap flights from PDX to ONT.
Choose your preferred departure and arrival times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from Portland International Airport to Ontario International Airport.

Handy information about Portland International Airport (PDX)

You'll find PDX at 7000 NE Airport Way.
Portland International Airport has an excellent on-time record, making delays less likely. Departures from PDX arrive at their destination as scheduled 83.65% of the time.
Portland International Airport is about 19 kilometres from central Portland. If you're ride-sharing, catching a cab or driving from the centre, it'll take 20 minutes or so to get there, depending on the traffic.
Expect a journey time of around 45 minutes on public transport.
Get your travels off to a relaxed start by staying near PDX. Whether you've booked an early flight from Portland International Airport to Ontario International Airport or just don't want to be rushed, these stays have you covered:

Arriving at Ontario International Airport (ONT)

If you have a late Portland International Airport to Ontario International Airport flight, nothing tops the convenience of staying near the terminal. Grab your luggage from the carousel and then be showered and resting not long after at one of these options near ONT:
Grab an Ontario International Airport rental car and explore Ontario and beyond with your own wheels. Dollar, Fox - Rent A Car and Thrifty are popular outlets you can book with here.
For the lowest price, book your ride from Ontario International Airport around three weeks before you travel.

Getting from Ontario International Airport (ONT) to central Ontario

ONT is located at 2900 E. Airport Drive.
From Ontario International Airport, Ontario is approximately 6 kilometres away. It takes around 10 minutes to reach the centre driving.
It takes roughly 1 hour 30 minutes if you're travelling by public transport.

When to fly to Ontario International Airport (ONT)

The quietest month for a flight from Portland International Airport to Ontario International Airport is May, while August is the busiest. Pick the ideal time to visit Ontario based on whether you prefer a more relaxed vibe or a faster pace.
Lock in your flight from Portland International Airport to Ontario International Airport for August if you want to go to Ontario during its warmest month. Expect temperatures of between 15ºC and 35ºC.
If you want cooler conditions, look for a cheap ticket from PDX to ONT in January. Average temperatures are between 4ºC and 23ºC then.

Explore more of United States

Los Angeles is just one of the many places in United States waiting to be explored once you've seen the sights of Ontario. Around 56 kilometres away to the west, check out popular attractions including Griffith Observatory, The Broad and La Brea Tar Pits & Museum.
If you're looking to explore another major stop in United States, consider San Diego, about 153 kilometres south of Ontario. San Diego Zoo, USS Midway Museum and SeaWorld San Diego are among the biggest draws.