Cheap Flights from Canada to London

London is Canada’s most-flown European route, with nonstops from coast to coast and two main airports competing for your fare. The cheapest trips usually happen between January and March and in November. Before you book, note one big change: Canadians now need a UK Electronic Travel Authorisation (ETA) before boarding.

Quick answer

• Airports: Heathrow (LHR) for Air Canada and British Airways; Gatwick (LGW) for WestJet and Air Transat. Search both with the code LON.
• Best gateways: Toronto, Montréal, Vancouver, Calgary and Halifax, plus seasonal flights from Ottawa, Québec City and St. John’s.
• Cheapest months: January–March (outside school breaks) and November.
• Deal threshold: roughly $550–$700 return from Toronto, Montréal or Halifax, taxes included.
• Entry: get your ETA before you fly; the fee rose to £20 in spring 2026 (verify before you fly).

Which Canadian airports fly to London

Air Canada flies to Heathrow from Toronto Pearson, Montréal, Vancouver, Calgary and Halifax, plus seasonal Ottawa service that has been paused in some winters. British Airways also flies to Heathrow from several major Canadian cities.

For Gatwick, WestJet flies from Calgary, Toronto, Halifax and seasonally from St. John’s, and has also flown Calgary–Heathrow. Air Transat serves Gatwick from Toronto, Montréal and Québec City, and launched Ottawa–Gatwick in May 2026. Summer schedules are much bigger than winter ones, so confirm your route before you plan around it.

UK ETA: what Canadians need to know

Canadians became eligible and required to hold a UK ETA from January 2025, and airlines began strictly enforcing the “no permission, no travel” rule in late February 2026. The fee rose from £16 to £20 in April 2026, according to the Home Office fee schedule. An ETA is generally valid for two years, or until your passport expires, and covers multiple visits of up to six months each. Applications usually take a few days, so don’t leave it until the airport.

Heads up: Apply only through the official UK government app or the GOV.UK website. Lookalike sites charge extra fees for the same application. Rules can change, so confirm on GOV.UK and travel.gc.ca before you fly.

When to find the cheapest flights

Period	Price level	Notes
January–March	Lowest	Avoid March break and UK half-term weeks
April–May	Moderate	Easter spikes; May is good value
June–August	Highest	Peak summer demand
September–October	Moderate	Great weather-to-price ratio
November	Low	Quiet before the holidays
December	High	Christmas travel

What a good fare looks like

Hedged guidance for return economy, in CAD, including taxes. These reflect typical fare patterns, not live prices.

From	Deal threshold to watch for	Typical range
Toronto, Montréal, Ottawa	$550–$700	$800–$1,200
Halifax, St. John’s	$550–$700	$750–$1,150
Calgary, Edmonton, Winnipeg	$650–$800	$900–$1,350
Vancouver	$700–$850	$950–$1,400

UK Air Passenger Duty applies to departures from the UK, which is one reason one-way fares from London often cost more than the Canada-to-London leg.

Pro tip: Some airlines let you add a free stop in Reykjavík or Lisbon on the way to London. Our stopover programs guide explains how.

Flight-only vs package

London is almost always a flight-only trip. Flight-and-hotel bundles can save money in peak summer, but compare them against booking separately, and check the hotel’s location relative to an Elizabeth line or Underground station.

Money-saving tips for London

• Tap the same card everywhere. Contactless pay-as-you-go on the Underground, buses and most rail within London has daily and weekly caps. Use one card per person.
• Visit the free museums. The British Museum, National Gallery, Tate Modern, Natural History Museum and many others have free general admission.
• Eat on a budget. Supermarket meal deals, market stalls and pub lunches stretch your pounds.
• Avoid card fees. A no-foreign-transaction-fee card saves roughly 2.5% on every purchase; check rates with our currency converter. This is general information, not financial advice.

Getting from the airport

Heathrow:

• Piccadilly line: the cheapest rail option, about an hour to central London.
• Elizabeth line: faster, with direct trains to Paddington, the West End and the City.
• Heathrow Express: the fastest non-stop service to Paddington, but usually the priciest unless booked well ahead.

Gatwick:

• Southern and Thameslink trains: usually cheaper than the dedicated express and reach Victoria, London Bridge and other central stations in roughly 30 to 45 minutes.
• Gatwick Express: convenient, but often costs more for little time saved.
• Coaches: the cheapest option when booked ahead, though slower in traffic.

Bottom line

London is easy to reach from across Canada, and the cheapest trips are in late winter and November. Compare Heathrow and Gatwick together, get your ETA through official channels well before departure, and use contactless transit caps once you land. To catch transatlantic seat sales, sign up for free deal alerts.