Frontier AirlinesDepart14:23
Thu, Nov 12ONT → PDX
3h 40m · 1 stop
$136one way, per person
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- Cheapest fare
- $123
- Cheapest month
- November
- Direct flights
- Not recently
- Quickest trip
- 3h 05m
Frontier Airlines · Mon, Nov 16
from $123
Usually 1+ stop
1,340 km
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Cheapest month to fly from Ontario to Portland
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in November 2026
The lowest fares we've seen for each day, cheapest first.
See every date in November 2026 →
Plan the rest of your trip to Portland
Where to stay, what to do and getting around, from our travel partners.
About flights from Ontario to Portland
Ontario (ONT) and Portland (PDX) are about 1,340 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 3h 05m. Over the next few months, one-way fares start from $123, 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 Ontario to Portland?
The cheapest one-way fare we've seen recently is $123 with Frontier Airlines, departing Monday, November 16, 2026. Over the coming months, the lowest fare in each month ranges from $123 to $215.
What is the cheapest month to fly from Ontario to Portland?
November 2026 currently has the lowest fares, from $123 one way.
Are there direct flights from Ontario to Portland?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from Ontario to Portland?
The quickest journey we've seen takes about 3h 05m. Ontario and Portland are around 1,340 km apart.
Which airlines fly from Ontario to Portland?
Recent fares on this route were with Frontier Airlines, United Airlines, American Airlines and Southwest Airlines.
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