£392 Find Cheap Flights from London to Seattle – Compare and Save

These are the earliest and latest flight times available from London to Seattle:

• Earliest: departs at 09:25 and lands at 19:35
• Latest: departs at 18:30 and lands at 04:40.

The flight takes about 10h 10m.

Four cabin classes are available on flights from London to Seattle:

• Economy class
• Premium Economy Class
• Business Class
• First Class

Prices vary by airline.

A direct flight from London to Seattle takes 10h 10m, covering 4,790 miles.

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Return flights from London to Seattle range from £514 to £712, with an average of £610 over the past 12 months. Anything below £514 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 22% above the £610 route average. Book 15 weeks before departure for the lowest fares.

On this route, stopover flights are cheaper than direct options on average. Stopover fares average £458 return via Zurich (ZRH), compared with £627 for direct.

Delta is slightly above the route average for timely arrivals, while Virgin Atlantic has a lower on-time arrival rate. On-time arrival rates on London to Seattle flights are:

• Delta: 95% on time
• Virgin Atlantic: 90% on time
• British Airways: 86% on time

On average, flights on this route are punctual 88% of the time.

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge £39–£76 for the first checked bag in Economy. Premium fares and elite status bookings typically include a free checked bag.

Afternoon is the busiest departure period on London to Seattle flights, with 75% leaving in that window. Morning departures account for 25%, Evening flights for 0%, and Night flights for 0%.

Four airlines offer in-flight Wi-Fi on London to Seattle flights:

• Virgin Atlantic
• Air France
• Delta
• KLM

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty programme, while others are paid add-ons priced by flight length.

One-way fares from London to Seattle are currently lower than usual. Average one-way flight prices are about £393, which is 24% below the typical average for this route.

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car hire companies, with daily rates starting from around £3 for economy cars. Top options include:

• Fox
• Europcar
• Thrifty
• Budget
• Hertz

Flights from London to Seattle may depart from several airports in London area, including London City (LCY), London Gatwick (LGW), London Heathrow (LHR), London Luton (LTN), London Southend (SEN) and London Stansted (STN). Flights usually arrive at Seattle/Tacoma Intl (SEA).

Evening flights have the fewest delays on this route, while afternoon departures tend to have the most.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the London to Seattle route, 12% of flights were delayed in the past three months, with delays averaging 2h 20m.

One-stop flights from London to Seattle most commonly connect through:

• Reykjavik Keflavik Intl (KEF) – 69% of one-stop connections
• Dublin (DUB) – 16% of one-stop connections
• Frankfurt am Main (FRA) – 4% of one-stop connections
• Kastrup Copenhagen (CPH) – 3% of one-stop connections

Yes. Flexible dates can save you up to 10% on flights from London to Seattle. Wednesday is the cheapest departure day at £588 return on average, while Sunday is the most expensive at £652, a difference of £64.

KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.

4 airlines operate flights between London and Seattle. The airlines offering direct flights on this route include:

• British Airways
• Delta
• Alaska Airlines
• Virgin Atlantic

Flying via Zurich (ZRH) gives the shortest average 1-stop total travel time of 13h 12m, compared to 13h 19m via Calgary (YYC) and 13h 32m via Denver Intl (DEN).

Seattle is 8 hours behind London (Pacific Time vs British Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Seattle are The Westin Seattle, Seattle Center, and Seattle Marriott Waterfront. These are among the most viewed places in Seattle on KAYAK.

Among airlines operating London to Seattle flights:

• Alaska Airlines: offers free seat selection
• Virgin Atlantic: offers extra legroom; offers free seat selection
• British Airways: offers free seat selection
• Delta: offers extra legroom; offers free seat selection
• KLM: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• Alaska Airlines: a cabin bag and a checked bag in Economy class
• Virgin Atlantic: a cabin bag and a checked bag in Economy class
• British Airways: a cabin bag and a checked bag in Economy class

Baggage allowance can vary by ticket type, cabin class, route, and airline, so always check the fare details before booking.

Those flying from London’s Stansted Airport (STN) can relax in style at the Escape Lounge. You can find this lounge in the main departure area once you have passed through security and the duty-free area. You can pre-book your entry into the lounge for £25 per person, however infants younger than 2 years can enter free of charge. The lounge is open from 4:00 – 22:30 daily.

If you would like to use public transport to travel into the city from Seattle Airport, you can catch the Red Line of the Link Light Rail train system from the airport station to Pioneer Square Station in downtown Seattle. The trip takes about 40min. There are also a number of bus services that can take you throughout the greater Seattle area, including the 574 line to Tacoma, taking approximately 30min.

The fastest way to get to London’s Gatwick Airport (LGW) using public transport from Central London is to take the Gatwick Express train. You can catch this train from Victoria Station every day from 5:00 – midnight. This train runs every 15min, stopping at Gatwick Airport’s South Terminal and taking 30min. Alternatively, the Thameslink also runs to Gatwick Airport in 30min from London Bridge Station every 20min.

If you have time before you fly from Heathrow Airport (LHR), you can enjoy a wide range of restaurants and dining options throughout the airport, depending on which terminal you are flying from. If you’re looking for a sit-down meal, you can find the Gorgeous Kitchen in Terminal 2, The Curator or The Cavier House & Prunier in Terminal 3, The Prince of Wales or Comptoir Libanais in Terminal 4 or the Crown Rivers Bar & Food at Terminal 5.

As the flight is relatively long from London to Seattle Airport, you might want to enhance your comfort by staying in a more exclusive cabin. For example, American Airlines provide a First Class cabin offering on the plane, so you can enjoy ultimate comfort in a fully reclining seat.

Upon landing at Seattle Airport, you will be able to find a range of car hire agencies, so you can have great flexibility with your journey. For example, you can find agencies such as Europcar conveniently located in the airport arrivals hall. Alternatively, you can get a free shuttle from outside the terminal to companies such as Avis.

You can use the KAYAK search filter to find airlines that emit less carbon dioxide during the flight. For example, KLM completes the journey emitting about 46% less CO2 than the industry standard.

As the flight is relatively long, you might want to stay online during the flight. You can use KAYAK to search for airlines, such as British Airways and KLM, which provide Wi-Fi to passengers. This means you can stay connected throughout your journey.