There are several airlines that operate frequent flights from Seattle (SEA) to London (LHR) including

• Delta Air Lines with 282 flights a week
• Alaska Airlines with 184 flights a week
• United Airlines with 141 flights a week
• Virgin Atlantic with 123 flights a week
• American Airlines with 110 flights a week

The earliest flight leaves Seattle Tacoma Intl. Airport at 13:15 and arrives at Heathrow Airport at 06:45. The last flight of the day departs Seattle at 20:37 and arrives at London at 13:35.

The flight distance from Seattle to London is about 7743 km, the shortest flight is 09 hours with WestJet.

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