Portland to Ontario flights
The cheapest round trip we found from Portland to Ontario is $285 (Nov 6 – 8, 1 stop).
PDX to ONT · Round trip · Economy · Prices per person in USD · Price found (2 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $285 |
| December 2026 | $251 (cheapest month) |
Cheapest dates in the next 4 months
Round trip, per person-
Nov 6 – 8 2 nights · leave Fri$285$285 Book
Frontier Airlines 1 stop · 3h 19m -
Nov 13 – 15 2 nights · leave Fri$389$389 Book
Southwest Airlines 1 stop · 3h 05m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Plan the rest of your trip
Ontario · Nov 6 – 8- Car rental Economybookings · compare rental companies (opens Economybookings in a new tab)
- Things to do in Ontario Klook · tours and tickets (opens Klook in a new tab)
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- Fresno $249
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Flights to Ontario from other cities
All flights to Ontario Flying the other way? Ontario to Portland from $153
Portland to Ontario: questions
How much does a flight from Portland to Ontario cost?
The cheapest round trip we have found right now is $285, leaving November 6 and returning November 8. Prices are per person, economy, in USD.
Which airports do Portland to Ontario flights use?
Portland airports include Portland International (PDX). Ontario airports include Ontario International (ONT). The prices on this page cover every airport in both cities (PDX and ONT are the city codes).
About this route
We track round-trip economy fares from Portland (United States) to Ontario (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $285, departing November 6 and returning November 8. The cheapest month to fly in our data is December, from $251. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.