Ontario to London flights

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Lowest observed

€737Checked on 12 Oct 2026

Cheapest month

February 2027

Last checked

12 Oct 2026

Observed fares. Prices may change.

Your next trip, last seen at €737

1 Feb 2027

United Airlines · 1 stop · 11 nights

Cheapest observed day · Last checked: 12 Oct 2026

Departure

07:00

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: €737, departing 1 Feb 2027 (Last checked: 12 Oct 2026)One-way fareCheck live prices for this route
Airlines seen: Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines, Iberia, JetBlue +2 more
Typical journey time: 12h 07m

Short answer

We have seen Alaska Airlines fares from Ontario to London. The lowest fare our own searches returned is €737, seen on 12 Oct 2026. February 2027 is the cheapest month in our observations, at €737. 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 London. Prices move often, so pick your dates to see the latest options.

Route distance: 8,725 km
Typical journey time: 12h 07m
Airlines seen: Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines, Iberia, JetBlue +2 more
Seen on fares with a connection: United Airlines, Delta Air Lines, Frontier Airlines, Alaska Airlines, American Airlines, Southwest Airlines
Alternative airports: LCY, LGW, LTN, SEN, STN

Route-level information; individual journeys vary.
We have not observed non-stop service on this route; the fares shown include at least one stop.

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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.
London City Airport (LCY) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 13 km.
London Heathrow (LHR) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 23 km.
London Gatwick (LGW) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 40 km.
London Luton (LTN) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 44 km.
London Stansted (STN) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 49 km.
London Southend Airport (SEN) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 57 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.