Ontario to Portland flights

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Lowest observed

€118

Average observed

€185

Cheapest month

November 2026

Last checked

7 Oct 2026

Observed fares. Prices may change.

Your next trip, last seen at €118

Lowest observed

7 Nov 2026

Southwest Airlines · 1 stop · 3 nights

Cheapest observed day · Last checked: 7 Oct 2026

Departure

16:00

When to fly

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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.

Prices are for observed departure and return date pairs. No data does not mean no flights.

Lowest observed: €118, departing 7 Nov 2026 (Last checked: 7 Oct 2026)One-way fareCheck live prices for this route
Airlines seen: Frontier Airlines, Southwest Airlines, United Airlines
Non-stop: Yes

Short answer

We have seen Frontier Airlines fares from Ontario to Portland. The lowest fare our own searches returned is €118, seen on 7 Oct 2026. The average across the fares we caught is €185. November 2026 is the cheapest month in our observations, at €118. These are prices our searches returned on the dates shown, not quotes; run a live search for today's fare.

About this route

Explore the fares we observed from Ontario to Portland. Prices move often, so pick your dates to see the latest options.

Route distance: 1,344 km
Airlines seen: Frontier Airlines, Southwest Airlines, United Airlines
Seen on fares with a connection: Southwest Airlines, Frontier Airlines, United Airlines

Route-level information; individual journeys vary.

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Observed, not guaranteed

Every price is a fare we actually saw, and it may change at any time.

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How our prices work

Airport to city: straight-line distance

Ontario International Airport (ONT) → Ontario, city gazetteer reference point (34.0500, -117.6400): ≈ 4 km.
Portland International Airport (PDX) → Portland, city gazetteer reference point (45.5051, -122.6750): ≈ 11 km.

Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.