C$ 430 Find Cheap Flights from Seattle to London Heathrow Airport – Compare and Save

If your flying dates are flexible, you should consider flying to London Heathrow Airport on a Saturday, as we generally find the cheapest rates on that day for this route. On the other hand, Thursday is the most expensive day to fly from Seattle to London Heathrow Airport. For your return ticket, we recommend flying on a Wednesday and avoiding Saturdays for the best deals.

The cheapest month for flights from Seattle to London Heathrow Airport is January, where tickets cost C$ 891 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is C$ 1,726 and C$ 1,428 respectively.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at C$ 1,027 on average.

To get a below average price on the flight from Seattle to London Heathrow Airport, you should book around 3 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

In the past 5 days, the cheapest round-trip tickets from Seattle to London Heathrow Airport were found on Scandinavian Airlines (C$ 1,028) and Icelandair (C$ 1,100).

British Airways connects Seattle to London Heathrow Airport with 14 flights per week. Delta also offers 7 flights per week, while Virgin Atlantic follows with 7 flights per week.

Weekly flights between Seattle and London historically see delays in approximately 14% of cases, with the average delay over the past year being 139 minutes.

Typically, flights leaving at night tend to face fewer delays, whereas flights in the evening have historically encountered delays more often.

Statistically, Saturday is the day of the week with the fewest delays on this flight route, while Thursday has typically experienced more delays than other days.

Based on our data, Virgin Atlantic have experienced the fewest delays on this route in the past 12 months, with only about 5% of their flights encountering any delays.

Reykjavik (KEF) is the top choice – 82% of KAYAK users who clicked on one-stop flights from Seattle to London Heathrow Airport picked an itinerary connecting there.

Flights via Dublin (DUB) offer the most affordable fares, with an average round-trip price of C$ 783.

Consider flying via Dublin (DUB) for the shortest journey. The average one-way travel time for flights connecting there is 11h 30m.

If you prefer a quick connection, Dublin (DUB) often has the shortest layovers from Seattle to London Heathrow Airport, with an average of 2h 00m.

There are 2 cabin class options for the route. These are Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

Each day, there are 5 nonstop flights that take off from Seattle and land in London Heathrow Airport, with an average flight time of 9h 24m. The most common departure time is 9:00 p.m. and most flights take off in the evening. Each week, there are 35 flights and there are the same amount of flights each day (5).