Route · CHS → SEA · 2020–2025 BTS data
Charleston to Seattle
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), CHS to SEA (Charleston to Seattle) ranks #4275 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 78.5%
- On-time
- -0.5 pts
- vs US avg
- 53 min
- Delay when late
- 1,314
- Flights
- #4275 of 4927
- Corpus placement
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 |
CHS–SEA seasonal on-time pattern
Best: March (93.5%) · weakest: December (68.8%)
Strongest calendar month
March
93.5% on-time · ~31 flights/mo
Busiest calendar month
March
~31 flights/mo avg
Weakest calendar month
December
68.8% on-time · ~31 flights/mo
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.
CHS on-time profileSEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
SEA on-time profileCompare the two airports
See CHS and SEA side by side on delays, cancellations, and reliability.
Compare CHS vs SEAOrigin-hub reliability standing
Mid-pack among CHS departures
From CHS, this corridor sits with 18 other 75–85% on-time routes out of 21 tracked departures, not the hub's reliability leaders (3 at ≥85%) and not the softest ( 0 below 75%). Destination: Seattle · fleet on-time rank #3669 of 4927.
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.
On the multi-year calendar, CHS–SEA peaks in March at 93.5% on-time ; the softest month is December at 68.8%, a 24.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does CHS to SEA rank among US routes by traffic? ▼
How often are flights delayed from CHS to SEA? ▼
What is the cancellation rate for CHS to SEA? ▼
How far is the flight from CHS to SEA? ▼
Airports on this route
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.
Using CHS–SEA data
CHS–SEA is mid-pack at 78.5% on-time; month and carrier mix move more than the corridor headline.
- Compare CHS and SEA airport profiles: delay causes and top routes differ even on the same corridor. CHS airport
- If your dates flex, March (93.5% on-time) beats December (68.8%) on this corridor. Seasonal chart
- 4 other routes post a similar 78.5% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.