Route · CHS → SEA · 2020–2025 BTS data
Charleston to Seattle
The CHS–SEA corridor (Charleston, SC → Seattle, WA) runs behind the national average, served by 1 carrier across roughly 2,415 miles.
Data updated 2026-06-13
- 78.5%
- On-time
- -0.5 pts
- vs US avg
- 53 min
- Delay when late
- 1,314
- Flights
Cancelled
0.8%
Best Month
N/A
Worst Month
N/A
Distance
2,415 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 31 | 14 | 0 | 0 | AS |
| Oct 2025 | 30 | 9 | 1 | 0 | AS |
| Sep 2025 | 30 | 5 | 0 | 0 | AS |
| Aug 2025 | 31 | 9 | 0 | 0 | AS |
| Jul 2025 | 31 | 16 | 1 | 0 | AS |
| Jun 2025 | 30 | 11 | 0 | 0 | AS |
| May 2025 | 31 | 8 | 0 | 0 | AS |
| Apr 2025 | 30 | 15 | 0 | 0 | AS |
| Mar 2025 | 31 | 3 | 0 | 0 | AS |
| Dec 2024 | 31 | 3 | 1 | 0 | AS |
| Oct 2024 | 30 | 2 | 0 | 0 | AS |
| Sep 2024 | 30 | 10 | 0 | 0 | AS |
| Aug 2024 | 31 | 10 | 2 | 1 | AS |
| Jul 2024 | 31 | 12 | 0 | 0 | AS |
| Jun 2024 | 30 | 8 | 0 | 1 | AS |
| May 2024 | 31 | 13 | 0 | 0 | AS |
| Apr 2024 | 30 | 8 | 0 | 0 | AS |
| Mar 2024 | 31 | 1 | 0 | 1 | AS |
| Nov 2023 | 30 | 6 | 0 | 0 | AS |
| Oct 2023 | 31 | 1 | 0 | 0 | AS |
| Sep 2023 | 30 | 4 | 0 | 0 | AS |
| Aug 2023 | 31 | 8 | 1 | 0 | AS |
| Jul 2023 | 31 | 4 | 0 | 0 | AS |
| Jun 2023 | 30 | 4 | 0 | 0 | AS |
Cancellation Rate
0.8%
6 of 733 flights
Diversion Rate
0.4%
3 of 733 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
CHS - Charleston
Full on-time, delay-cause, and seasonal performance for Charleston, SC.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See CHS 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 CHS–SEA.
Routes with a similar on-time rate
What the Data Says About CHS to SEA
1,314 tracked flights put the CHS to SEA pairing (Charleston to Seattle) at a 78.5% on-time rate, squarely in line with the wider network. Delays that do occur run 52.8 minutes on average. Across the 2,415-mile route and its 1 carrier, the trailing 24 months show 0.8% cancelled and 0.4% diverted (733 flights sampled).
Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.
Frequently Asked Questions
How often are flights delayed from CHS to SEA? ▼
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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.