Route · DAL → SEA · 2020–2025 BTS data
Dallas to Seattle
The DAL–SEA corridor (Dallas, TX → Seattle, WA) runs behind the national average, served by 4 carriers across roughly 1,670 miles.
Data updated 2026-06-13
- 75.1%
- On-time
- -3.9 pts
- vs US avg
- 56 min
- Delay when late
- 1,923
- Flights
Cancelled
1.5%
Best Month
Aug 2023 91%
Worst Month
Jul 2023 78%
Distance
1,670 mi
Carriers
4
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Sep 2025 | 30 | 11 | 0 | 0 | WN |
| Aug 2025 | 32 | 10 | 0 | 0 | WN |
| Jul 2025 | 35 | 13 | 2 | 0 | WN |
| Jun 2025 | 30 | 11 | 0 | 0 | WN |
| Dec 2024 | 31 | 5 | 0 | 0 | AS |
| Oct 2024 | 31 | 3 | 0 | 0 | AS |
| Sep 2024 | 39 | 12 | 0 | 0 | WN,AS |
| Aug 2024 | 41 | 17 | 0 | 0 | AS,WN |
| Jul 2024 | 43 | 17 | 0 | 0 | AS,WN |
| Jun 2024 | 40 | 5 | 0 | 0 | AS,WN |
| Apr 2024 | 30 | 3 | 0 | 0 | AS |
| Mar 2024 | 31 | 3 | 1 | 0 | AS |
| Dec 2023 | 31 | 1 | 0 | 0 | AS |
| Oct 2023 | 31 | 2 | 0 | 0 | AS |
| Sep 2023 | 37 | 1 | 0 | 2 | AS,WN |
| Aug 2023 | 64 | 6 | 0 | 3 | AS,WN |
| Jul 2023 | 67 | 15 | 0 | 2 | AS,WN |
| Jun 2023 | 48 | 10 | 1 | 4 | AS,WN |
| May 2023 | 31 | 4 | 0 | 0 | AS |
| Apr 2023 | 30 | 6 | 0 | 0 | AS |
| Dec 2022 | 36 | 14 | 7 | 0 | AS,WN |
| Nov 2022 | 32 | 4 | 2 | 0 | WN,AS |
| Oct 2022 | 31 | 2 | 0 | 0 | AS |
| Sep 2022 | 31 | 4 | 0 | 1 | WN,AS |
Cancellation Rate
1.5%
13 of 882 flights
Diversion Rate
1.4%
12 of 882 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
DAL - Dallas
Full on-time, delay-cause, and seasonal performance for Dallas, TX.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See DAL 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 DAL–SEA.
Routes with a similar on-time rate
What the Data Says About DAL to SEA
The Dallas to Seattle corridor (DAL to SEA) posts a 75.1% on-time rate on the lower edge of the average band, based on 1,923 tracked flights. Late flights run 56.4 minutes behind on average. 4 carriers cover the 1,670-mile route; over the last 24 months, 13 of 882 flights were cancelled (1.5%) and 1.4% diverted.
Monthly performance varies moderately here: Aug 2023 was the strongest month at 91% on-time versus Jul 2023 at 78%, a 13-point difference.
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.