Route
SEA → MIA
Seattle–Tacoma International Airport Miami International Airport
2,724 miles
Return route MIA → SEA →
How punctual is this route?
- On-time arrivals
- 79.7%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,231
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 47%
- Air traffic control & airport 28%
- Late-arriving aircraft 23%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.9% | 90 |
| October 2025 | 90.2% | 93 |
| November 2025 | 81.1% | 97 |
| December 2025 | 77.3% | 120 |
| January 2026 | 77.6% | 102 |
| February 2026 | 81.9% | 84 |
| March 2026 | 70.3% | 93 |
| April 2026 | 74.2% | 90 |
| May 2026 | 79.8% | 104 |
| June 2026 | 79.8% | 120 |
| July 2026 | 81.8% | 124 |
| August 2026 | 81.6% | 114 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| American Airlines | 475 | 78.4% | 0.8% | 73 min |
| Alaska Airlines | 391 | 80.5% | 0.3% | 45 min |
| Delta Air Lines | 365 | 80.7% | 1.4% | 71 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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