Route
MIA → SEA
Miami International Airport Seattle–Tacoma International Airport
2,724 miles
Return route SEA → MIA →
How punctual is this route?
- On-time arrivals
- 68.7%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 68 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,233
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 44%
- Late-arriving aircraft 30%
- Air traffic control & airport 21%
- Extreme weather 4%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 64.4% | 90 |
| October 2025 | 78.3% | 93 |
| November 2025 | 69.1% | 96 |
| December 2025 | 66.9% | 121 |
| January 2026 | 62.4% | 103 |
| February 2026 | 69.0% | 84 |
| March 2026 | 46.6% | 93 |
| April 2026 | 60.7% | 90 |
| May 2026 | 66.0% | 104 |
| June 2026 | 81.7% | 120 |
| July 2026 | 74.8% | 125 |
| August 2026 | 77.0% | 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 | 72.5% | 0.4% | 56 min |
| Alaska Airlines | 392 | 69.1% | 1.3% | 52 min |
| Delta Air Lines | 366 | 63.4% | 1.6% | 94 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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