Southwest Airlines BWI to SEA on-time performance
Southwest Airlines nonstop flights from Baltimore to Seattle · Aug 2025 – Jul 2026
On-time arrivals
72%
arrived < 15 min late
Cancelled
0.8%
1 flights
Avg arrival delay
21 min
70 min when late
Rank on route
#1 of 2
route average 71% on time
Key facts
- Southwest Airlines flights on BWI to SEA arrived on time 72% of the time in Aug 2025 – Jul 2026.
- 0.8% were cancelled, and 10% arrived an hour or more late.
- That ranks #1 of 2 airlines on this route, which averaged 71% on time overall.
- The largest source of delay minutes was late-arriving aircraft (36%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft36%
- Air traffic control & airport congestion27%
- Airline (crew, maintenance, cleaning, fueling)21%
- Extreme weather16%
- Security0%
Other airlines on BWI to SEA
- Alaska Airlines71% on time · 15 min avg delay
Full BWI to SEA comparison →
Southwest Airlines on-time record across all routes →
120 Southwest Airlines flights tracked on this route; 1 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.