Seattle to London (SEA–LHR) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
SEA–LHR is served by 5 airlines with nonstop service. Finnair, British Airways and Aer Lingus lead the route. The flight covers 4,786 miles in approximately 9h 30m. Beyond nonstop, 54 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AY Finnair | 14 | 777, 78X | 9h30-9h35 | Oneworld | – | |
| BA British Airways | 14 | 777, 781 | 9h35-10h06 | Oneworld | – | |
| EI Aer Lingus | 14 | 781, 78X | 9h30-9h35 | – | – | |
| DL Delta Air Lines | 7 | 332 | 9h50 | SkyTeam | – | |
| VS Virgin Atlantic | 7 | 789 | 10h08 | SkyTeam | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Travel Essentials
SEA: MDT · LHR: GMT
When it's 6:00 PM in Seattle, it's 12:00 AM (next day) in London.
US citizens need a UK Electronic Travel Authorisation (ETA) before travel, applied for online. The ETA costs GBP 10 and is valid for multiple entries over 2 years. Stays are permitted for up to 6 months per visit. Passport must be valid for the duration of stay.
Declare goods over GBP 390 in value. UK duty-free allowances apply on goods from outside the UK.
Link Light Rail runs from downtown Seattle (Westlake station) to the airport in 38 minutes ($3.50 peak). Trains run every 6–12 minutes during peak hours from 5am to 1am. Ride-shares run $30–50 from downtown; SR-99 and I-5 can be heavily congested southbound during afternoon rush (3–7pm).
Sound Transit 574 express bus serves Tacoma ($2.50–4). Sounder commuter rail connects Tacoma to the airport area via a shuttle.
Heathrow Express runs every 15 minutes to Paddington (15 min, £25). Piccadilly line is slower (50–60 min) but £5.50 with Oyster. National Express coaches serve all terminals from Victoria (60–90 min, £6–10). Black cabs cost £50–90 to central London depending on traffic and time of day.
Mild maritime climate. Summers average 18–23°C with long daylight hours. Winters are 2–7°C, rarely below freezing. Rain is frequent year-round but rarely heavy. Pack layers and a waterproof jacket regardless of season. Fog can disrupt flights November through February.
SEA–LHR Quick Facts
Frequently Asked Questions
Flights from SEA to LHR
Seattle–Tacoma International Airport (SEA) and London Heathrow Airport (LHR) are connected by nonstop service from Finnair, British Airways, Delta Air Lines, Aer Lingus and Virgin Atlantic. With 56 weekly departures, this is a heavily served route.
SEA to LHR Flight Duration and Schedule
Nonstop flight time from SEA to LHR ranges from 9 hours 30 minutes to 10 hours 8 minutes. The route covers a distance of 4,786 miles (7,702 km). There are approximately 56 weekly flights outbound and 63 return, totaling 119 flights per week in both directions.
Connecting Options and Alternatives
54 one-stop connections are available, with the fastest taking approximately 12 hours via LUX. Two-stop connections are also available via intermediate hubs.