American Airlines SEA to MIA on-time performance
American Airlines nonstop flights from Seattle to Miami · Aug 2025 – Jul 2026
On-time arrivals
77%
arrived < 15 min late
Cancelled
0.9%
4 flights
Avg arrival delay
18 min
71 min when late
Rank on route
#3 of 3
route average 78% on time
Key facts
- American Airlines flights on SEA to MIA arrived on time 77% of the time in Aug 2025 – Jul 2026.
- 0.9% were cancelled, and 8% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was late-arriving aircraft (48%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft48%
- Airline (crew, maintenance, cleaning, fueling)44%
- Air traffic control & airport congestion8%
- Extreme weather1%
- Security0%
Other airlines on SEA to MIA
- Alaska Airlines80% on time · 9 min avg delay
- Delta Air Lines79% on time · 14 min avg delay
Full SEA to MIA comparison →
American Airlines on-time record across all routes →
454 American Airlines flights tracked on this route; 4 cancelled, 3 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.