$337 Find Cheap Flights from Seattle to London - Compare and Save

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

• Earliest: departs at 1:30 pm and lands at 11:04 pm
• Latest: departs at 9:50 pm and lands at 7:24 am.

The flight takes about 9h 34m.

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

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

Prices vary by airline.

A nonstop flight from Seattle to London takes 9h 34m, 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.

Round-trip flights from Seattle to London range from $674 to $1,090, with an average of $857 over the past 12 months. Anything below $674 counts as a good deal.

Last-minute fares on this route - booked within 2 weeks of departure - run 20% above the route average of $857. Book 10 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $639 round-trip via Montreal Pierre Elliott Trudeau Intl (YUL), compared to $906 for nonstop.

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

• Virgin Atlantic: 96% on time
• Delta: 89% on time
• British Airways: 81% on time

Overall, flights on this route are on time 87% of the time on average.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $56–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

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

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

• Virgin Atlantic
• Delta
• Air France
• KLM

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

One-way fares from Seattle to London are currently lower than usual. Average one-way flight prices are about $344, which is 33% below the typical average for this route.

Since London is served by multiple airports, car rental options and rates can vary depending on which one you fly into.
Near London Heathrow Airport (LHR) — daily rates from around $7:

• GREEN MOTION
• DRIVALIA
• Europcar
• Alamo
• Hertz

Near London Gatwick Airport (LGW) — daily rates from around $8:

• GREEN MOTION
• DRIVALIA
• U-Save
• Europcar
• Alamo

Near London City Airport (LCY) — daily rates from around $11:

• GREEN MOTION
• Budget
• Hertz
• Avis
• Sixt

Near London Luton Airport (LTN) — daily rates from around $11:

• GREEN MOTION
• DRIVALIA
• Alamo
• Europcar
• Budget

Near London Stansted Airport (STN) — daily rates from around $10:

• GREEN MOTION
• DRIVALIA
• Europcar
• Alamo
• U-Save

Flights from Seattle to London usually depart from Seattle/Tacoma Intl (SEA) and may arrive at 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).

Afternoon 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.

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 Seattle to London route, 13% of flights were delayed in the past 3 months, with delays averaging 2 hours 14 minutes.

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

• Reykjavik Keflavik Intl (KEF) - 75% of one-stop connections
• Dublin (DUB) - 10% of one-stop connections
• Kastrup Copenhagen (CPH) - 4% of one-stop connections
• Frankfurt am Main (FRA) - 4% 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 13% on the Seattle to London route. Tuesday is the cheapest departure day at $807 round-trip on average, while Friday is the most expensive at $918, a difference of $111. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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

• British Airways
• Delta
• Alaska Airlines
• Virgin Atlantic

Flying via Dublin (DUB) gives the shortest average 1-stop total travel time at 13h 05m, compared with 13h 34m via Denver Intl (DEN) and 13h 34m via Helsinki-Vantaa (HEL).

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

Some of the most popular sights in London are Hyde Park, Buckingham Palace and Trafalgar Square. These are among the most viewed places in London on KAYAK.

Among airlines operating Seattle to London flights:

• Alaska Airlines: offers free seat selection
• British Airways: offers extra legroom; offers free seat selection
• Virgin Atlantic: offers extra legroom; offers free seat selection
• Delta: offers extra legroom; offers free seat selection
• Air France: 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
• British Airways: a cabin bag and a checked bag in Economy Class
• Virgin Atlantic: 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.

Heathrow Airport features a number of hotels connected directly to its terminals, so visitors have a selection of airports to choose from. In Terminal 4 travelers will find the Hilton London Heathrow Airport and the capsule hotel YOTEL, while in Terminal 5 there is the Sofitel London Heathrow. Gatwick airport also has a variety of hotel options available, such as Hampton by Hilton, YOTELAIR, and Bloc Hotel.

British Airways, Iberia, Virgin Atlantic, Finnair, and Delta Air Lines all offer direct nonstop flights from Seattle to London via Heathrow Airport. Many other airlines also offer one-stop flights to London from Seattle with final destinations varying largely between Heathrow Airport, Gatwick Airport, and London City Airport.

The Heathrow Express is the fastest way to get to central London from Heathrow Airport and is conveniently connected to Terminals 2, 3, and 5. There is also a direct London Underground connection via the Piccadilly Line, for those who prefer the cheaper (but slower) method of travel.

Both airports are conveniently connected via public transport to central London with travel times roughly equal. However, if your final destination is on the south or east side of London, then Gatwick is likely the better option due to its close proximity, while Heathrow is more convenient for destinations on the west and north side.

Both London Heathrow Airport (LHR) and Gatwick Airport (LGW) provide direct train and subway links to the Buckingham Palace. LHR sits around 1h away on the Piccadilly subway line, while LGW is approximately 45min away on the Southern train line or Gatwick Express.

Every terminal at the London Heathrow Airport (LHR) features luggage storage lockers. Those using Terminal 1 should locate the lockers on the lower level on the International Arrivals foyer. Storage duration ranges from 3h to a maximum of 90 days.

Numerous car rental agencies provide services at the Gatwick Airport (LGW), with most of their pick-up garages situated at the North and South Terminals of LGW. It’s prudent to make early reservations if you want to get affordable rates.

London Heathrow Airport (LHR) has essential amenities like flight vending machines, information screens, and seating in every host area. Those arriving via Terminal 3 will find the host areas post-security, near World Duty Free, after the toilets. Still, the arrival terminal has wheelchair-accessible restrooms, located inside the men's and women's toilets. Dedicated agents are there to guide you through the security clearance.