Route · MIA → SEA · 2020–2025 BTS data
Miami to Seattle
The MIA–SEA corridor (Miami, FL → Seattle, WA) runs behind the national average, served by 6 carriers across roughly 2,724 miles.
Data updated 2026-06-13
- 70.7%
- On-time
- -8.3 pts
- vs US avg
- 77 min
- Delay when late
- 3,534
- Flights
Cancelled
1.6%
Best Month
Oct 2024 85%
Worst Month
Aug 2025 54%
Distance
2,724 mi
Carriers
6
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 121 | 39 | 1 | 2 | DL,AS,AA |
| Nov 2025 | 96 | 29 | 2 | 0 | AA,AS,DL |
| Oct 2025 | 93 | 20 | 1 | 0 | AA,AS,DL |
| Sep 2025 | 90 | 32 | 0 | 0 | DL,AA,AS |
| Aug 2025 | 93 | 43 | 1 | 1 | AA,AS,DL |
| Jul 2025 | 93 | 32 | 2 | 0 | AA,AS,DL |
| Jun 2025 | 90 | 27 | 0 | 0 | AA,AS,DL |
| May 2025 | 93 | 30 | 0 | 1 | AA,AS,DL |
| Apr 2025 | 90 | 21 | 0 | 0 | DL,AA,AS |
| Mar 2025 | 93 | 35 | 0 | 1 | AA,AS,DL |
| Feb 2025 | 84 | 21 | 0 | 1 | AA,AS,DL |
| Jan 2025 | 103 | 26 | 0 | 1 | AA,AS,DL |
| Dec 2024 | 103 | 34 | 1 | 0 | AA,AS,DL |
| Nov 2024 | 68 | 11 | 0 | 1 | AS,AA |
| Oct 2024 | 62 | 9 | 4 | 0 | AS,AA |
| Sep 2024 | 60 | 13 | 1 | 0 | AA,AS |
| Aug 2024 | 62 | 17 | 3 | 0 | AA,AS |
| Jul 2024 | 62 | 28 | 0 | 0 | AA,AS |
| Jun 2024 | 60 | 25 | 2 | 0 | AA,AS |
| May 2024 | 62 | 28 | 0 | 0 | AA,AS |
| Apr 2024 | 60 | 15 | 0 | 0 | AA,AS |
| Mar 2024 | 62 | 21 | 2 | 1 | AA,AS |
| Feb 2024 | 58 | 15 | 0 | 0 | AA,AS |
| Jan 2024 | 69 | 19 | 11 | 0 | AA,AS |
Cancellation Rate
1.6%
31 of 1,927 flights
Diversion Rate
0.5%
9 of 1,927 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MIA - Miami
Full on-time, delay-cause, and seasonal performance for Miami, FL.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See MIA and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to MIA–SEA.
Routes with a similar on-time rate
What the Data Says About MIA to SEA
On-time performance on the MIA to SEA pairing (Miami to Seattle) trails a chunk of the network: 70.7% of 3,534 tracked flights arrived on schedule, with a 77.4-minute average delay on the ones that ran late. The route spans about 2,724 miles across 6 carriers. Cancellations over the trailing 24 months hit 1.6% (31 of 1,927 flights), with 0.5% diverted.
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 85% on-time, while Aug 2025 came in at just 54% - a 32-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.