Seattle-Tacoma International ⇄ Seoul SEA–ICN
Airlines flew 2,958 flights between Seattle-Tacoma International SEA in Seattle, WA and Seoul, South Korea ICN in Seoul, KR in the twelve months to July 2026, both directions together: 642,521 passengers in 779,638 seats, 82% of them filled, and 89,740,760 pounds of freight. 5,217 miles, about 249 minutes in the air, on 10 airlines: Korean Air Lines Co. Ltd. (962), Delta Air Lines Inc. (758), Asiana Airlines Inc. (561), Alaska Airlines Inc. (339) and 6 more.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 223 |
| 2/25 | 202 |
| 3/25 | 223 |
| 4/25 | 219 |
| 5/25 | 222 |
| 6/25 | 225 |
| 7/25 | 231 |
| 8/25 | 208 |
| 9/25 | 215 |
| 10/25 | 242 |
| 11/25 | 248 |
| 12/25 | 253 |
| 1/26 | 251 |
| 2/26 | 229 |
| 3/26 | 256 |
| 4/26 | 258 |
| 5/26 | 264 |
| 6/26 | 263 |
| 7/26 | 271 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 47,536 |
| 2/25 | 38,253 |
| 3/25 | 44,170 |
| 4/25 | 46,435 |
| 5/25 | 47,612 |
| 6/25 | 48,836 |
| 7/25 | 48,188 |
| 8/25 | 50,493 |
| 9/25 | 46,555 |
| 10/25 | 51,802 |
| 11/25 | 50,160 |
| 12/25 | 52,492 |
| 1/26 | 49,642 |
| 2/26 | 46,606 |
| 3/26 | 61,480 |
| 4/26 | 56,825 |
| 5/26 | 59,177 |
| 6/26 | 58,205 |
| 7/26 | 59,084 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Korean Air Lines Co. Ltd. KE | 962 | 198,891 | 86% | charter cargo service, scheduled cargo service, scheduled passenger service |
| Delta Air Lines Inc. DL | 758 | 178,543 | 80% | charter passenger service, scheduled passenger service |
| Asiana Airlines Inc. OZ | 561 | 149,952 | 86% | scheduled passenger service |
| Alaska Airlines Inc. AS | 339 | 80,000 | 79% | scheduled passenger service |
| AIRZETA CO Ltd. KJ | 169 | 0 | scheduled cargo service | |
| Hawaiian Airlines Inc. HA | 156 | 34,904 | 75% | scheduled passenger service |
| National Air Cargo Group Inc d/ba National Airlines N8 | 7 | 0 | charter cargo service | |
| Kalitta Air LLC KAQ | 3 | 0 | charter cargo service | |
| Atlas Air Inc. 5Y | 2 | 0 | 0% | charter cargo service |
| Philippine Airlines Inc. PR | 1 | 231 | 47% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Airbus Industrie A350-900 | 1,293 | 305 | 328,726 |
| Boeing 787-10 Dreamliner | 616 | 325 | 172,248 |
| B787-900 Dreamliner | 609 | 296 | 141,547 |
| Boeing B747-8 | 214 | 0 | 0 |
| Boeing 747-400F | 169 | 0 | 0 |
| Boeing 747-400 | 22 | 9 | 0 |
| Boeing 767-400/ER | 16 | 148 | 0 |
| Boeing B777-F | 8 | 0 | 0 |
| Airbus Industrie A330-300/333 | 7 | 242 | 0 |
| Boeing 767-300/300ER | 3 | 214 | 0 |
| Airbus Industrie A330-900 | 1 | 281 | 0 |
SEA → ICN this direction alone · flown January 2025 to July 2026
1,665 flights of 613 scheduled, 321,758 passengers in 383,008 seats, 59,927,704 pounds of freight, 48,533 pounds of mail. Korean Air Lines Co. Ltd. 597; Delta Air Lines Inc. 362; Asiana Airlines Inc. 279; Alaska Airlines Inc. 169; AIRZETA CO Ltd. 169; Hawaiian Airlines Inc. 78; National Air Cargo Group Inc d/ba National Airlines 7; Kalitta Air LLC 3; Atlas Air Inc. 1.
ICN → SEA this direction alone · flown January 2025 to July 2026
1,293 flights of 613 scheduled, 320,763 passengers in 396,630 seats, 29,813,056 pounds of freight, 226,524 pounds of mail. Delta Air Lines Inc. 396; Korean Air Lines Co. Ltd. 365; Asiana Airlines Inc. 282; Alaska Airlines Inc. 170; Hawaiian Airlines Inc. 78; Atlas Air Inc. 1; Philippine Airlines Inc. 1.
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 Seoul, South Korea ICN; all routes.