Flights from London to SEA
Live fares, trusted airlines, and the best time to book — everything you need to plan London to SEA.
Route snapshot: London to SEA
London to SEA is a 9h 45m air corridor covering roughly 7,701 km and typically searched by travelers comparing direct and one-stop options.
Check fares, see which airlines fly this route, and sort out airports, visas, and what to do at the destination — all before you book.
When you land in SEA
Sort the airport transfer and pick a few things to do so you hit the ground running.
Getting out of SEA (SEA)
Skip the taxi rank and lock in your fare before you land.
Pre-book a fixed-price transfer
Our pickDriver waits at arrivals with your name, tracks your flight, and the price you see is the price you pay. No surge, no haggling at 2am.
Check transfer pricesRenting a car instead? Compare rentals with free cancellation.Things to do in SEA
Lock in a few experiences before you go — the good ones sell out.
Tours, tickets & day trips
Our pickGetYourGuide has the deepest catalogue for SEA and free cancellation on most experiences — book now, decide later.
Browse SEAJust need timed-entry attraction tickets? Try Tiqets.Flights LHR → SEA
Compare live fares from London to SEA across 750+ airlines.
Find hotels in SEA
1.4M+ properties · Trip.com
Why travelers watch this route
Route economics
LHR–SEA sits in the Ultra long-haul fare band, with economy prices often starting around $600 when booked at the right time.
Seasonality
SEA has year-round travel demand, so fare differences often depend more on booking window and airline competition than on one single peak season.
Airline competition
This corridor is usually compared across 5 common airline options, which is why checking both the route page and the live fare search can uncover better timing and booking opportunities.
Airlines flying London to SEA
These carriers commonly operate the LHR–SEA route or connect via regional hubs.
London–SEA route intelligence
Updated analysis of the LHR–SEA corridor — distance, fares, timing, and connecting options.
Route profile
London (LHR) to SEA (SEA) is a long-haul corridor spanning approximately 7,701 km, with typical block time around 9h 45m. Published fares cluster between $600 and $1600 in economy. Ultra long-haul.
Best time to book
Long-haul fares on this corridor are best booked 8-12 weeks ahead. Premium-economy upgrades are often cheapest at the 10-week mark.
Connecting hubs to compare
If a nonstop on the LHR–SEA corridor is sold out or overpriced, one-stop itineraries through London (LHR), Reykjavik (KEF), Dublin (DUB) are typically the strongest alternatives — often 20-40% cheaper than nonstop, with 3-12 hours added to total journey time.
Visa & arrival
Passport-validity and visa requirements differ between UK and — most arriving travellers need at least six months of remaining passport validity. Check AirConnect's visa checker for your nationality before booking, especially if you plan to connect through a third country en route.
Direct & Connecting Flights
Multiple airlines operate between London (LHR) and SEA (SEA). Compare direct and connecting options to find the best price. Direct flights take approximately 9h 45m.
Fares & Price Guide
Economy fares on LHR–SEA typically range from $600 to $1600 USD one-way. Book 6–10 weeks ahead for the best prices, or set a fare alert to catch price drops automatically.
About SEA
SEA is a popular destination for AirConnect travellers. Browse our destination guide for hotels, visa requirements, and travel tips.
Plan this route beyond the fare
Use the wider AirConnect network to move from a route check into airports, airlines, visa, and trip planning.
Search LHR → SEA
Compare live fares and book with Trip.com.
Airport Guides
Check terminals, transport and arrival details for LHR and SEA.
Airline Route Maps
See which airlines dominate the LHR–SEA corridor and nearby connections.
SEA Planning
Turn this flight route into a full trip with destination, hotel and activity planning.
Price Alerts
Track fare drops on LHR–SEA and related city pairs.
Visa Guides
Check entry rules before booking flights from UK to SEA.
Explore related route clusters
These hubs help search engines and travelers understand where this corridor sits in the wider route graph.
Deals on London → SEA
Limited-time offers — grab them before they're gone
Frequently asked questions — London to SEA flights
Ready to book LHR–SEA?
Set a fare alert, check your visa, or search flights now.