Delta Air Lines is launching a non-stop daily service between Heathrow and Seattle from March 2014.
The route will be operated by a 210-seat Boeing 767-300ER aircraft featuring 35 full flat-bed seats in business, 32 seats in premium economy and 143 economy seats.
The outgoing flight departs Seattle-Tacoma International Airport at 18:40 and arrives at Heathrow at 12:05 the following day.
The return service leaves Heathrow at 12:20 and arrives at Seattle at 14:40 on the same day.
Currently, only British Airways flies on the Seattle to London route with a daily service which codeshares with joint business partner American Airlines and sister carrier Iberia.
Tickets for the route, which started on 29 March (30 March for the return service), are available to purchase now.