Southwest Airlines MCI to BOS on-time performance
Southwest Airlines nonstop flights from Kansas City to Boston · Aug 2025 – Jul 2026
On-time arrivals
46%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
34 min
61 min when late
Rank on route
#3 of 3
route average 73% on time
Key facts
- Southwest Airlines flights on MCI to BOS arrived on time 46% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 19% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (44%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion44%
- Late-arriving aircraft42%
- Airline (crew, maintenance, cleaning, fueling)14%
- Extreme weather0%
- Security0%
Other airlines on MCI to BOS
- Delta Air Lines69% on time · 35 min avg delay
- Republic Airways83% on time · 16 min avg delay
Full MCI to BOS comparison →
Southwest Airlines on-time record across all routes →
57 Southwest Airlines flights tracked on this route; 0 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.