Seattle-Tacoma International ⇄ Baltimore/Washington International Thurgood Marshall SEA–BWI
Airlines flew 1,441 flights between Seattle-Tacoma International SEA in Seattle, WA and Baltimore/Washington International Thurgood Marshall BWI in Baltimore, MD in the twelve months to July 2026, both directions together: 218,647 passengers in 251,647 seats, 87% of them filled, and 886,226 pounds of freight. 2,335 miles, about 266 minutes in the air, on 6 airlines: Alaska Airlines Inc. (1,192), Southwest Airlines Co. (239), Atlas Air Inc. (7), United Air Lines Inc. (1) and 2 more. Planning to fly it yourself? The weather and winds along this route right now.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 57 |
| 2/25 | 48 |
| 3/25 | 62 |
| 4/25 | 73 |
| 5/25 | 115 |
| 6/25 | 173 |
| 7/25 | 182 |
| 8/25 | 186 |
| 9/25 | 181 |
| 10/25 | 111 |
| 11/25 | 105 |
| 12/25 | 121 |
| 1/26 | 69 |
| 2/26 | 55 |
| 3/26 | 62 |
| 4/26 | 75 |
| 5/26 | 116 |
| 6/26 | 175 |
| 7/26 | 185 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 8,401 |
| 2/25 | 7,056 |
| 3/25 | 9,002 |
| 4/25 | 11,342 |
| 5/25 | 18,403 |
| 6/25 | 26,606 |
| 7/25 | 28,482 |
| 8/25 | 29,346 |
| 9/25 | 27,468 |
| 10/25 | 16,296 |
| 11/25 | 14,196 |
| 12/25 | 17,609 |
| 1/26 | 9,215 |
| 2/26 | 7,457 |
| 3/26 | 9,825 |
| 4/26 | 11,410 |
| 5/26 | 17,866 |
| 6/26 | 27,895 |
| 7/26 | 30,064 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Alaska Airlines Inc. AS | 1,192 | 180,900 | 86% | scheduled passenger service |
| Southwest Airlines Co. WN | 239 | 37,346 | 94% | scheduled passenger service |
| Atlas Air Inc. 5Y | 7 | 174 | 12% | charter passenger service |
| United Air Lines Inc. UA | 1 | 35 | 21% | scheduled passenger service |
| Delta Air Lines Inc. DL | 1 | 192 | 99% | scheduled passenger service |
| Omni Air International LLC X9 | 1 | 0 | 0% | charter passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing 737-900ER | 583 | 178 | 88,813 |
| Boeing B737 Max 900 | 469 | 178 | 72,866 |
| Boeing 737-800 | 211 | 166 | 31,455 |
| Boeing B737 Max 800 | 113 | 173 | 17,893 |
| Boeing 737-700/700LR/Max 7 | 56 | 141 | 7,254 |
| Boeing 747-400 | 7 | 215 | 174 |
| Boeing 767-300/300ER | 1 | 272 | 0 |
| Airbus Industrie A321-200n | 1 | 194 | 192 |
SEA → BWI this direction alone · flown January 2025 to July 2026
723 flights of 729 scheduled, 111,510 passengers in 127,068 seats, 625,927 pounds of freight, 6,632 pounds of mail. Alaska Airlines Inc. 598; Southwest Airlines Co. 120; Atlas Air Inc. 4; United Air Lines Inc. 1.
BWI → SEA this direction alone · flown January 2025 to July 2026
718 flights of 731 scheduled, 107,137 passengers in 124,579 seats, 260,299 pounds of freight, 4,542 pounds of mail. Alaska Airlines Inc. 594; Southwest Airlines Co. 119; Atlas Air Inc. 3; Delta Air Lines Inc. 1; Omni Air International LLC 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 Baltimore/Washington International Thurgood Marshall BWI; all routes.