Seattle (SEA) → London (LHR)
A reference for the Seattle Tacoma International Airport to London Heathrow Airport route. You'll find the operators on file, the great-circle geometry, the connecting options if no nonstop fits your dates, and a short profile of each endpoint airport.
The flight from Seattle (SEA) to London (LHR) covers a great-circle distance of roughly 7,702 km (4,786 miles). Aircraft leave Seattle Tacoma International Airport on an initial northeast heading. As international sectors go, this one sits in the extended long-haul bracket: long enough that most carriers run it as its own dedicated rotation, but short enough to fit inside a single crew duty period.
8 carriers file a direct SEA to LHR sector, with American Airlines and Air France among the operators on record. A route attracting this many carriers usually points to a city pair with both leisure and business demand, or a competitive hub-to-hub link where the airline alliances overlap on the same metal.
Operators on the SEA → LHR direction
Carriers with at least one scheduled rotation on this sector in the OpenFlights dataset, ranked by the number of code-shared filings.
| IATA | Airline | Country | Callsign |
|---|---|---|---|
| AA | American Airlines | United States | AMERICAN |
| AF | Air France | France | AIRFRANS |
| AY | Finnair | Finland | FINNAIR |
| BA | British Airways | United Kingdom | SPEEDBIRD |
| DL | Delta Air Lines | United States | DELTA |
| IB | Iberia Airlines | Spain | IBERIA |
| KL | KLM Royal Dutch Airlines | Netherlands | KLM |
| VS | Virgin Atlantic Airways | United Kingdom | VIRGIN |
Sectors this long are almost always flown by widebodies with extra fuel tankage. The 787-9, A350-900, and 777 family are the regulars on routes like this. Block time runs about 9h 48m, with two meal services, a long sleep cycle, and (on premium fares) lie-flat seating that's now the industry default for journeys this long.
If a nonstop doesn't match your dates, Atlanta (ATL), Chicago (ORD), and Paris (CDG) show up on both ends of the network and make the most natural connecting points. The connecting-hubs grid below extends that list to the eight strongest options, ranked by each airport's overall departure activity. That ranking is a fast proxy for how many onward flights a single stop is likely to feed.
Connecting hubs
Airports that already appear on both ends of this network. They're the natural one-stop options when no nonstop matches your dates, ranked by overall departure activity.
This is an international sector between United States and United Kingdom. Build in time for passport validity, possible visa requirements, and the time-zone gap between Seattle and London. International itineraries are quoted in local time at each end, so a "midnight" departure in Seattle typically lands the next morning in London. Customs clearance happens on first arrival in the destination country.
On the day of operation, the SEA to LHR direction lifts off heading northeast, then the great-circle track curves to compensate for the Earth's rotation. The return LHR to SEA sector heads northwest out of the gate, with 3 operators on file for the inbound side. Combine the two operator lists for a full picture of the city pair's competitive landscape.
Endpoints
Other routes from Seattle (SEA)
Other destinations served from the same origin. Handy for combining trips or for finding an alternate first leg.
Other routes into London (LHR)
Other origins that already file scheduled service into the destination airport.
Reading this route page
The operator list reflects scheduled-route filings in the OpenFlights dataset, not real-time availability. A carrier appearing here publishes a scheduled service on this sector. It isn't a live timetable, and the actual flight numbers, frequencies, and aircraft types shift season to season. For booking and current schedules, cross-reference the airline page above with the carrier's own website.
Distance here is the great-circle arc between the two airports' published coordinates. Real flight tracks wander off that line because of wind, ATC routings, oceanic crossings, and political airspace constraints. Block time is an estimate covering ground taxi, climb, cruise at typical jet speeds, and descent. Real block times shift with aircraft type, weather, and traffic, so treat the stat-strip number as a planning indicator rather than a published flight time.