$516 Find Cheap Flights from London Heathrow Airport to Seattle - Compare and Save

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

• Earliest: departs at 9:25 am and lands at 7:36 pm
• Latest: departs at 2:55 pm and lands at 1:06 am.

The flight takes about 10h 11m.

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

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

Prices vary by airline.

A nonstop flight from London Heathrow Airport to Seattle takes 10h 11m, 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 London Heathrow Airport to Seattle range from $695 to $944, with an average of $813 over the past 12 months. Anything below $695 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 22% above the $813 route average. Book 15 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $652 round-trip via Reykjavik Keflavik Intl (KEF), compared to $828 for nonstop.

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 Heathrow Airport to Seattle flights are:

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

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

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.

The Boeing 787-9 Dreamliner family is used most often on this route, operated mainly by Alaska Airlines and Lufthansa. Other aircraft seen on the route include Boeing 787-10 Dreamliner variants.

Afternoon is the busiest departure period on London Heathrow Airport to Seattle flights, with 100% of flights leaving in that window. Morning departures account for 0%, evening flights for 0%, and night flights for 0%.

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

• Virgin Atlantic
• Air France
• KLM
• Delta

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 London Heathrow Airport to Seattle are currently lower than usual. Average one-way flight prices are about $520, which is 24% below the typical average for this route.

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates averaging $61 for economy cars. Top options include:

• Fox
• Europcar
• Thrifty
• Budget
• Hertz

Flights from London Heathrow Airport to Seattle usually depart from London Heathrow (LHR) and 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 Heathrow Airport to Seattle route, 12% of flights were delayed in the past 3 months, with delays averaging 2h 20m.

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

• Reykjavik Keflavik Intl (KEF) - 56% of one-stop connections
• Dublin (DUB) - 27% of one-stop connections
• Kastrup Copenhagen (CPH) - 6% of one-stop connections
• Munich Franz Josef Strauss (MUC) - 3% of one-stop connections

Yes. Flexible dates can save you up to 9% on flights from London Heathrow Airport to Seattle. Wednesday is the cheapest departure day at $790 round-trip on average, while Sunday is the most expensive at $860, a difference of $70.

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 London Heathrow Airport and Seattle. 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 06m, compared with 12h 56m via Paris Charles de Gaulle (CDG) and 13h 19m via Calgary (YYC).

Seattle is 7 hours behind London Heathrow Airport (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 Pike Place Market, Lumen Field and Space Needle. These are among the most viewed places in Seattle on KAYAK.

Among airlines operating London Heathrow Airport 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.

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 always check the fare details before booking.