London Heathrow (LHR) to Seattle / Tacoma (SEA) flight deal from $562 USD in economy class

AFAir France

DLDelta Air Lines

KLKLM

Round Trip•Economy

LHR

London Heathrow Airport

London Heathrow, United Kingdom

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$854 USD

-34%$562 USD

Verified Nov 4, 2025 at 1:14 PM

December 2025

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1$716 2$672 3$659 4$885 5$882 6$888 7$890 8$873 9$873 10$873 11$873 12$899 13$899 14$890 15$890 16$927 17$944 18$873 19$941 20$1,329 21$879 22$873 23$818 24$807 25$714 26$727 27$727 28$731 29$731 30$736 31$736 1 2 3 4

Extremely Rare Availability

3% of dates checked are available within 10% of the lowest price

Thursday, December 18th, 2025

10 round-trip options

Returning

Tue, Dec 23, 2025•5 Day Trip

$927 USD

Google Flights

Returning

Wed, Dec 24, 2025•6 Day Trip

$927 USD

Google Flights

Returning

Thu, Dec 25, 2025•7 Day Trip

$1,097 USD

Google Flights

Returning

Fri, Dec 26, 2025•8 Day Trip

$1,078 USD

Google Flights

Returning

Sat, Dec 27, 2025•9 Day Trip

$949 USD

Google Flights

Returning

Sun, Dec 28, 2025•10 Day Trip

$927 USD

Google Flights

Returning

Mon, Dec 29, 2025•11 Day Trip

$947 USD

Google Flights

Returning

Tue, Dec 30, 2025•12 Day Trip

$949 USD

Google Flights

Returning

Wed, Dec 31, 2025•13 Day Trip

$957 USD

Google Flights

Returning

Thu, Jan 1, 2026•14 Day Trip

$873 USD

Google Flights