Cheapest return flights from Seattle to London in December from 402€
AirHint found the following cheapest return flights from Seattle (SEA) to London (LHR)
in December 2025 (see full year ).
Return flights
28 Dec
- 13 Jan
Lufthansa
402 €
02 Dec
- 10 Dec
Lufthansa
426 €
03 Dec
- 14 Jan
Delta
434 €
02 Dec
- 10 Dec
Virgin Atlantic
439 €
direct
03 Dec
- 10 Dec
Icelandair
441 €
01 Dec
- 08 Dec
Icelandair
445 €
01 Dec
- 07 Dec
Aer Lingus
450 €
16 Dec
- 23 Dec
Air France
482 €
direct
01 Dec
- 08 Dec
Virgin Atlantic
483 €
direct
08 Dec
- 15 Dec
Icelandair
495 €
26 Dec
- 12 Jan
Icelandair
540 €
28 Dec
- 13 Jan
British Airways
543 €
direct
03 Dec
- 10 Dec
British Airways
558 €
direct
26 Dec
- 15 Jan
Icelandair
583 €
26 Dec
- 15 Jan
British Airways
599 €
direct
01 Dec
- 31 Dec
Delta
646 €
direct
26 Dec
- 02 Jan
Lufthansa
793 €
17 Dec
- 02 Jan
Air Canada
810 €
17 Dec
- 04 Jan
Delta
938 €
26 Dec
- 02 Jan
British Airways
966 €
direct
Also check the deals for one-way flights from Seattle to London in December .
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers.
Only the cheapest flights are offered.
Select a price to book and secure these cheap prices.
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