Delta Air Lines MIA to SEA on-time performance
Delta Air Lines nonstop flights from Miami to Seattle · Aug 2025 – Jul 2026
On-time arrivals
62%
arrived < 15 min late
Cancelled
1.6%
6 flights
Avg arrival delay
37 min
94 min when late
Rank on route
#3 of 3
route average 67% on time
Key facts
- Delta Air Lines flights on MIA to SEA arrived on time 62% of the time in Aug 2025 – Jul 2026.
- 1.6% were cancelled, and 12% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 67% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (60%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)60%
- Late-arriving aircraft23%
- Air traffic control & airport congestion14%
- Extreme weather3%
- Security0%
Other airlines on MIA to SEA
- American Airlines70% on time · 17 min avg delay
- Alaska Airlines68% on time · 17 min avg delay
Full MIA to SEA comparison →
Delta Air Lines on-time record across all routes →
366 Delta Air Lines flights tracked on this route; 6 cancelled, 2 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.