WN551: Boston to Baltimore
Southwest Airlines flight WN551 flies from Boston (BOS) to Baltimore (BWI), 594 km. Over August 2025 to July 2026 it usually arrives about 11 minutes late: 71% of 435 flights arrived within 15 minutes of schedule and 0.2% were cancelled (US Department of Transportation data).
On-time record, last 12 months
Every operation of WN551, August 2025 to July 2026: 435 flights. Source: US Bureau of Transportation Statistics, public domain.
Routes flown as WN551
- Boston (BOS) to Baltimore (BWI)57 flights
- Austin Bergstrom (AUS) to Denver (DEN)42 flights
- Tampa (TPA) to Austin Bergstrom (AUS)42 flights
- Nashville (BNA) to Los Angeles (LAX)41 flights
- Austin Bergstrom (AUS) to Panama City (ECP)35 flights
- Atlanta (ATL) to Las Vegas (LAS)33 flights
- Austin Bergstrom (AUS) to Boston (BOS)32 flights
- Houston (HOU) to Las Vegas (LAS)31 flights
- St. Louis (STL) to Atlanta (ATL)28 flights
- Baltimore (BWI) to Orlando (MCO)24 flights
Other flights from Boston to Baltimore
More about Boston (BOS) and Baltimore (BWI).
Questions and answers
- Is WN551 usually on time?
- 71% of Southwest Airlines flight WN551's 435 flights from August 2025 to July 2026 arrived within 15 minutes of schedule, 7.1 points below the US average of 77.6%. It arrived about 11 minutes late on average.
- How often is WN551 cancelled or badly delayed?
- 0.2% of WN551's scheduled flights were cancelled from August 2025 to July 2026 (1 of 435), and 17% of the flights that operated arrived more than 30 minutes late.
- What route does WN551 fly?
- WN551 most often flies from Boston (BOS) to Baltimore (BWI), 594 km (57 flights in the period). The same flight number also flew Austin Bergstrom (AUS) to Denver (DEN), Tampa (TPA) to Austin Bergstrom (AUS), Nashville (BNA) to Los Angeles (LAX).
- Where do these WN551 figures come from?
- From the US Bureau of Transportation Statistics (BTS) on-time records, which cover every domestic flight by the larger US airlines. The figures cover August 2025 to July 2026 and are updated each month when new BTS data is published, about two months after the month ends. See how TripStow measures punctuality.
How does Southwest Airlines compare? Southwest Airlines' on-time record and the US airline league table.
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