Route · SEA → MIA · 2020–2025 BTS data
Seattle to Miami
The SEA–MIA corridor (Seattle, WA → Miami, FL) runs behind the national average, served by 6 carriers across roughly 2,724 miles.
Data updated 2026-06-13
- 78.6%
- On-time
- -0.4 pts
- vs US avg
- 72 min
- Delay when late
- 3,504
- Flights
Cancelled
1.2%
Best Month
Oct 2025 90%
Worst Month
Aug 2025 65%
Distance
2,724 mi
Carriers
6
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 120 | 27 | 1 | 0 | DL,AS,AA |
| Nov 2025 | 97 | 18 | 1 | 1 | AA,AS,DL |
| Oct 2025 | 93 | 9 | 1 | 0 | AA,AS,DL |
| Sep 2025 | 90 | 17 | 0 | 1 | DL,AA,AS |
| Aug 2025 | 93 | 33 | 1 | 0 | AA,AS,DL |
| Jul 2025 | 93 | 28 | 2 | 1 | AA,AS,DL |
| Jun 2025 | 90 | 24 | 0 | 0 | AA,AS,DL |
| May 2025 | 92 | 13 | 0 | 0 | AA,AS,DL |
| Apr 2025 | 90 | 14 | 0 | 0 | AA,AS,DL |
| Mar 2025 | 93 | 14 | 0 | 0 | AA,AS,DL |
| Feb 2025 | 84 | 15 | 0 | 0 | AA,AS,DL |
| Jan 2025 | 102 | 22 | 0 | 0 | AA,AS,DL |
| Dec 2024 | 103 | 25 | 0 | 0 | AA,AS,DL |
| Nov 2024 | 69 | 14 | 0 | 1 | AS,AA |
| Oct 2024 | 62 | 6 | 3 | 1 | AS,AA |
| Sep 2024 | 60 | 10 | 1 | 0 | AA,AS |
| Aug 2024 | 62 | 20 | 2 | 0 | AA,AS |
| Jul 2024 | 62 | 17 | 0 | 0 | AA,AS |
| Jun 2024 | 60 | 8 | 2 | 0 | AA,AS |
| May 2024 | 62 | 11 | 0 | 0 | AA,AS |
| Apr 2024 | 60 | 6 | 0 | 0 | AA,AS |
| Mar 2024 | 62 | 14 | 0 | 0 | AA,AS |
| Feb 2024 | 58 | 10 | 0 | 0 | AA,AS |
| Jan 2024 | 69 | 24 | 9 | 0 | AA,AS |
Cancellation Rate
1.2%
23 of 1,926 flights
Diversion Rate
0.3%
5 of 1,926 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Origin airport →MIA - Miami
Full on-time, delay-cause, and seasonal performance for Miami, FL.
Destination airport →Compare the two airports
See SEA and MIA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–MIA.
Routes with a similar on-time rate
What the Data Says About SEA to MIA
3,504 tracked flights put the SEA to MIA pairing (Seattle to Miami) at a 78.6% on-time rate, squarely in line with the wider network. Delays that do occur run 71.8 minutes on average. Across the 2,724-mile route and its 6 carriers, the trailing 24 months show 1.2% cancelled and 0.3% diverted (1,926 flights sampled).
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 90% on-time, while Aug 2025 came in at just 65% - a 26-point swing worth factoring into travel timing.
Frequently Asked Questions
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Flight Guides
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.