$511 Find Cheap Flights from London to Seattle - Compare and Save

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.

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
• KLM: offers extra legroom; offers free seat selection
• Delta: offers extra legroom; offers free seat selection

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

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

• British Airways
• Delta
• Alaska Airlines
• Virgin Atlantic

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).

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

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

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

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

Prices vary by airline.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $605 round-trip via Zurich (ZRH), compared to $826 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $51–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

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

• Reykjavik Keflavik Intl (KEF) - 72% of one-stop connections
• Dublin (DUB) - 14% of one-stop connections
• Kastrup Copenhagen (CPH) - 3% of one-stop connections
• Frankfurt am Main (FRA) - 3% of one-stop connections

Reykjavik Keflavik Intl (KEF) handles the largest share of one-stop connections on this route.

Yes. Being flexible with your travel dates can save you up to 12% on the London to Seattle route. Wednesday is the cheapest departure day at $769 round-trip on average, while Sunday is the most expensive at $865, a difference of $96. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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, 11% of flights were delayed in the past 3 months, with delays averaging 2 hours 17 minutes.

Afternoon is the busiest departure period on London to Seattle flights, with 50% of flights leaving in that window. Morning departures account for 25%, evening flights for 25%, and night flights for 0%.

Some of the most popular sights in Seattle are Pike Place Market, Pier 66 and Lumen Field. These are among the most viewed places in Seattle on KAYAK.

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

• Earliest: departs at 9:25 am and lands at 7:33 pm
• Latest: departs at 6:30 pm and lands at 4:38 am.

The flight takes about 10h 08m.

Last-minute fares on this route - booked within 2 weeks of departure - run 19% above the route average of $801. Book 15 weeks before departure for the lowest fares.

A nonstop flight from London to Seattle takes 10h 08m, 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.

One-way fares from London to Seattle are currently lower than usual. Average one-way flight prices are about $513, which is 27% below the typical average for this route.

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: 96% on time
• Virgin Atlantic: 90% on time
• British Airways: 86% on time

Overall, flights on this route are on time 89% of the time on average.

Evening flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

Flying via Zurich (ZRH) gives the shortest average 1-stop total travel time at 13h 12m, compared with 13h 19m via Calgary (YYC) and 13h 30m via Dublin (DUB).

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

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around $4 for economy cars. Top options include:
• Fox
• Europcar
• Thrifty
• Budget
• Dollar

Round-trip flights from London to Seattle range from $674 to $937, with an average of $801 over the past 12 months. Anything below $674 counts as a good deal.

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

• • Virgin Atlantic
• • Air France
• • KLM
• • Delta