Cheapest one-way flights from Seattle to London in July from $349

Best time to book flights for Seattle (SEA) to London (LHR) flights at AirHint

AirHint found the following cheapest one-way flights from Seattle (SEA) to London (LHR) in July 2025 (see full year).

One-Way flights

18 Jul Frontier Airlines
26 Jul Frontier Airlines
21 Jul Frontier Airlines
07 Jul Frontier Airlines
29 Jul Hawaiian Airlines
27 Jul Icelandair
01 Jul WestJet
07 Jul British Airways direct
14 Jul United
29 Jul Air France direct

Also check the deals for return flights from Seattle to London in July.

Skyscanner

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.

Book a cheap hotel in London

Cheap car rent in London