Seattle-Tacoma International ⇄ Keflavik/Reykjavik SEA–KEF
Airlines flew 1,469 flights between Seattle-Tacoma International SEA in Seattle, WA and Keflavik/Reykjavik, Iceland KEF in Keflavik/Reykjavik, IS in the twelve months to July 2026, both directions together: 207,421 passengers in 255,553 seats, 81% of them filled, and 763,857 pounds of freight. 3,622 miles, about 37 minutes in the air, on 3 airlines: Icelandair (1,338), Alaska Airlines Inc. (129), Delta Air Lines Inc. (2).
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 67 |
| 2/25 | 53 |
| 3/25 | 62 |
| 4/25 | 98 |
| 5/25 | 143 |
| 6/25 | 181 |
| 7/25 | 186 |
| 8/25 | 184 |
| 9/25 | 146 |
| 10/25 | 106 |
| 11/25 | 60 |
| 12/25 | 62 |
| 1/26 | 62 |
| 2/26 | 56 |
| 3/26 | 70 |
| 4/26 | 116 |
| 5/26 | 142 |
| 6/26 | 225 |
| 7/26 | 240 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 9,979 |
| 2/25 | 8,094 |
| 3/25 | 9,811 |
| 4/25 | 14,346 |
| 5/25 | 20,641 |
| 6/25 | 26,443 |
| 7/25 | 29,656 |
| 8/25 | 28,765 |
| 9/25 | 22,086 |
| 10/25 | 15,567 |
| 11/25 | 9,627 |
| 12/25 | 10,212 |
| 1/26 | 9,267 |
| 2/26 | 8,483 |
| 3/26 | 7,775 |
| 4/26 | 15,461 |
| 5/26 | 18,090 |
| 6/26 | 29,316 |
| 7/26 | 32,772 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Icelandair FI | 1,338 | 189,999 | 81% | scheduled passenger service |
| Alaska Airlines Inc. AS | 129 | 17,011 | 82% | scheduled passenger service |
| Delta Air Lines Inc. DL | 2 | 411 | 73% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing B737 Max 800 | 791 | 163 | 104,415 |
| Airbus Industrie A321Neoxlr | 638 | 187 | 96,662 |
| Boeing 757-200 | 34 | 183 | 5,315 |
| Boeing 767-300/300ER | 2 | 262 | 371 |
| Boeing 737-900 | 2 | 178 | 247 |
| Airbus Industrie A330-900 | 2 | 281 | 411 |
SEA → KEF this direction alone · flown January 2025 to July 2026
733 flights of 65 scheduled, 100,897 passengers in 127,386 seats, 31,963 pounds of freight. Icelandair 668; Alaska Airlines Inc. 65.
KEF → SEA this direction alone · flown January 2025 to July 2026
736 flights of 64 scheduled, 106,524 passengers in 128,167 seats, 731,894 pounds of freight. Icelandair 670; Alaska Airlines Inc. 64; Delta Air Lines Inc. 2.
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 Keflavik/Reykjavik, Iceland KEF; all routes.