London to Ontario flights

Routavio compares airline fares from several flight booking sites. Search London to Ontario to see the lowest price before you book.

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Last checked

29 Oct 2026

Observed fares. Prices may change.

Your next trip

13 Dec 2026

One way

Cheapest observed day

No observed fare for 13 Dec 2026 yet. Run a live search for this day or pick a nearby day below.

When to fly

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One-way fare

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Airlines seen: Alaska Airlines, American Airlines, British Airways, Iberia, Lufthansa, United Airlines
Typical journey time: 12h 13m

Short answer

Routavio has seen Alaska Airlines fares from London to Ontario. These are prices Routavio's 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 London to Ontario. Prices move often, so pick your dates to see the latest options.

Route distance: 8,725 km
Typical journey time: 12h 13m
Seen on fares with a connection: Alaska Airlines, British Airways, American Airlines, United Airlines, Iberia
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

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.
Ontario International Airport (ONT) → Ontario, city gazetteer reference point (34.0500, -117.6400): ≈ 4 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.