฿18,185 Cheap Delta flights from Seattle to London (SEA→LON)

View ฿18,185 flight on Mon, 7 Sept 2026Opens in a new window

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 40% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Delta flights from Seattle to London (SEA→LON)

Prices were available within the past 7 days and start at ฿18,185 for one-way flights and ฿29,730 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, 7 Sept - Wed, 30 Sept
SEA
Seattle
LHR
London
฿29,730 Return, found 3 days ago
฿29,730
Return
found 3 days ago
Select Delta flight, departing Mon, 7 Sept from Seattle to London, returning Wed, 30 Sept, priced at ฿29,730 found 3 days ago

Find the cheapest month to fly from Seattle (SEA) to London (LON)

April is typically the cheapest month to fly

From ฿19,317 - ฿36,740 per traveller.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Distance
7657 km
*Available to Expedia members.