Cheap flights from Portland to Ontario

One-way fares from $382 · PWM → ONT · prices found by travellers in the last 48 hours

Compare all dates Ontario → Portland
Cheapest fare
$382

Southwest Airlines · Fri, Nov 13

Cheapest month
November

from $382

Direct flights
Not recently

Usually 1+ stop

Quickest trip
8h 00m

4,180 km

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Cheapest month to fly from Portland to Ontario

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 Cheapest $382

Plan the rest of your trip to Ontario

Where to stay, what to do and getting around, from our travel partners.

Where to stay

Hotels in OntarioCompare places to stay on Booking.com Find hotels →

Things to do

Things to do in OntarioTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in OntarioPre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in OntarioCompare rental cars from major brands on EconomyBookings Compare cars →

About flights from Portland to Ontario

Portland (PWM) and Ontario (ONT) are about 4,180 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 8h 00m. Over the next few months, one-way fares start from $382, and November 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Portland to Ontario?

The cheapest one-way fare we've seen recently is $382 with Southwest Airlines, departing Friday, November 13, 2026.

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

November 2026 currently has the lowest fares, from $382 one way.

Are there direct flights from Portland to Ontario?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Portland to Ontario?

The quickest journey we've seen takes about 8h 00m. Portland and Ontario are around 4,180 km apart.

Which airlines fly from Portland to Ontario?

Recent fares on this route were with Southwest Airlines.

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