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

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

• Earliest: departs at 1:30 pm and lands at 11:06 pm
• Latest: departs at 6:45 pm and lands at 4:21 am.

The flight takes about 9h 36m.

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

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

Prices vary by airline.

A nonstop flight from Seattle to London Heathrow Airport takes 9h 36m, covering 4,783 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 Heathrow Airport range from $757 to $1,170, with an average of $938 over the past 12 months. Anything below $757 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 21% above the $938 route average. Book 18 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $629 round-trip via Montreal Pierre Elliott Trudeau Intl (YUL), compared to $973 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 Heathrow Airport flights are:

• Virgin Atlantic: 96% on time
• Delta: 89% on time
• Alaska Airlines: 82% on time

Overall, flights on this route are punctual 86% of the time on average.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $70–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Boeing 787-10 Dreamliner family is used most often on this route, operated mainly by British Airways and Finnair. Other aircraft seen on the route include Airbus A330-900neo variants.

Evening is the busiest departure period on Seattle to London Heathrow Airport flights, with 66% of flights leaving in that window. Afternoon departures account for 33%, morning flights for 1%, and night flights for 0%.

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

• Delta
• Virgin Atlantic
• 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 Heathrow Airport are currently lower than usual. Average one-way flight prices are about $417, which is 20% below the typical average for this route.

London Heathrow Airport (LHR) hosts 5 major car rental companies, with daily rates averaging $39 for economy cars. Top options include:

• GREEN MOTION
• DRIVALIA
• Europcar
• Alamo
• Hertz

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

Night flights have the fewest delays on this route, while evening 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 Seattle to London Heathrow Airport route, 14% of flights were delayed in the past 3 months, with delays averaging 2h 12m.

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

• Reykjavik Keflavik Intl (KEF) - 70% of one-stop connections
• Dublin (DUB) - 11% of one-stop connections
• Kastrup Copenhagen (CPH) - 8% of one-stop connections
• Vancouver Intl (YVR) - 4% of one-stop connections

Yes. Flexible dates can save you up to 17% on flights from Seattle to London Heathrow Airport. Monday is the cheapest departure day at $871 round-trip on average, while Friday is the most expensive at $1,042, a difference of $171.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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

• British Airways
• Delta
• Alaska Airlines

Flying via Amsterdam Schiphol (AMS) gives the shortest average 1-stop total travel time at 12h 26m, compared with 13h 14m via Dublin (DUB) and 13h 34m via Helsinki-Vantaa (HEL).

London Heathrow Airport 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 Heathrow Airport are Hyde Park and Buckingham Palace. These are among the most viewed places in London Heathrow Airport on KAYAK.

Among airlines operating Seattle to London Heathrow Airport flights:

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

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

If you are having an early morning flight at Seattle Tacoma international airport and want to spend the night at the airport, there are armrest seats and benches. You can also bring a sleeping bag and heavy clothes to lay on one of the floors with carpets. Passengers can use the meditation room, which provides a peaceful and quiet place. We recommend passengers carry noise-canceling headphones and earplugs to avoid loud noises from the busy airport. Passengers willing to spend extra money can spend the night at the nearby hotels. Nearby hotels offering free shuttle services to and from the airport include Crowne Plaza Seattle Airport, Radisson Hotel Seattle Airport and La Quinta Inn & Suites Seattle SeaTac airport.

Passengers who want to leave their vehicle at the airport can reserve a parking lot by booking online before to avoid inconveniences. Seattle Tacoma international airport offers long-term and short-term parking services. The long-term parking is located on the fourth floor of the parking garage. There are also self-service kiosks outside gates B, C, D, N and S, where passengers can download their favorite movies for their trip.

If you arrive early at Seattle Tacoma international airport, enjoy the services offered at the airport. Loosen your stiff muscles at the massage bars near gate A5 on the airside of level 5. Passengers who want to freshen up can take advantage of Delta airlines sky club.

Traveling can sometimes be cumbersome, and passengers may want to relax or take a nap after arrival. Aerotol London Heathrow airport, located inside LHR airport, offers guest rooms. Passengers can relax and finish work upon arrival at the airport. Plaza Premium Lounge & No. 1 Heathrow is a hotel inside the airport with private napping rooms where passengers can relax. There are also nearby hotels where passengers can relax and have their meals.