Seattle-Tacoma International ⇄ London SEA–LHR
Airlines flew 2,703 flights between Seattle-Tacoma International SEA in Seattle, WA and London, United Kingdom LHR in London, GB in the twelve months to July 2026, both directions together: 563,864 passengers in 695,460 seats, 81% of them filled, and 24,247,676 pounds of freight. 4,800 miles, about 174 minutes in the air, on 4 airlines: British Airways Plc (1,253), Delta Air Lines Inc. (723), Virgin Atlantic Airways (584), Alaska Airlines Inc. (143).
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 166 |
| 2/25 | 142 |
| 3/25 | 170 |
| 4/25 | 240 |
| 5/25 | 245 |
| 6/25 | 239 |
| 7/25 | 244 |
| 8/25 | 247 |
| 9/25 | 239 |
| 10/25 | 233 |
| 11/25 | 177 |
| 12/25 | 184 |
| 1/26 | 185 |
| 2/26 | 162 |
| 3/26 | 187 |
| 4/26 | 223 |
| 5/26 | 269 |
| 6/26 | 293 |
| 7/26 | 304 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 31,818 |
| 2/25 | 25,910 |
| 3/25 | 35,955 |
| 4/25 | 44,767 |
| 5/25 | 50,405 |
| 6/25 | 53,008 |
| 7/25 | 58,107 |
| 8/25 | 59,499 |
| 9/25 | 56,028 |
| 10/25 | 46,103 |
| 11/25 | 32,836 |
| 12/25 | 37,134 |
| 1/26 | 33,458 |
| 2/26 | 28,686 |
| 3/26 | 37,597 |
| 4/26 | 43,579 |
| 5/26 | 55,164 |
| 6/26 | 64,021 |
| 7/26 | 69,759 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| British Airways Plc BA | 1,253 | 276,279 | 88% | scheduled passenger service |
| Delta Air Lines Inc. DL | 723 | 141,110 | 76% | scheduled passenger service |
| Virgin Atlantic Airways VS | 584 | 114,377 | 74% | scheduled passenger service |
| Alaska Airlines Inc. AS | 143 | 32,098 | 75% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing 787-10 Dreamliner | 534 | 256 | 119,616 |
| Boeing 777-300/300ER/333ER | 467 | 254 | 108,864 |
| Airbus Industrie A330-900 | 425 | 281 | 87,269 |
| Airbus A330-900neo | 410 | 266 | 85,029 |
| B787-900 Dreamliner | 396 | 264 | 76,878 |
| Airbus Industrie A330-200 | 295 | 222 | 53,155 |
| Boeing 777-200ER/200LR/233LR | 166 | 235 | 30,894 |
| Airbus Industrie A330-300/333 | 10 | 269 | 2,159 |
SEA → LHR this direction alone · flown January 2025 to July 2026
1,351 flights of 437 scheduled, 284,793 passengers in 347,678 seats, 7,364,998 pounds of freight, 16 pounds of mail. British Airways Plc 626; Delta Air Lines Inc. 362; Virgin Atlantic Airways 291; Alaska Airlines Inc. 72.
LHR → SEA this direction alone · flown January 2025 to July 2026
1,352 flights of 436 scheduled, 279,071 passengers in 347,782 seats, 16,882,678 pounds of freight. British Airways Plc 627; Delta Air Lines Inc. 361; Virgin Atlantic Airways 293; Alaska Airlines Inc. 71.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: Seattle-Tacoma International SEA and London, United Kingdom LHR; all routes.