Route Reliability
Seattle → Charleston
SEA–CHS · 2,415 miles · Seattle–Tacoma International Airport to Charleston International Airport
- 85%
- Arrive within 15 minutes
- 5 min early
- Average arrival delay
- 0.3%
- Cancelled
- 347
- Flights in the data
Data through May 2026.
Alaska Airlines is the only airline in this data on this route, arriving on time 85% of the time across 347 flights. No comparison to make.
What the data says
The 9 AM–12 PM departure wins.
SEA–CHS flights departing between 9 AM–12 PM arrived on time 92% of the time, versus 71% between 6–9 AM.
Friday is doing you no favors.
SEA–CHS flights arrived on time 91% of the time on Tuesdays. On Fridays: 80%.
It basically never cancels.
Out of 347 scheduled flights, only 0.3% were cancelled.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
The breakdown
- Mon83%(52 flights)
- Tue91%(43 flights)
- Wed85%(52 flights)
- Thu84%(51 flights)
- Fri80%(51 flights)
- Sat91%(43 flights)
- Sun85%(53 flights)
- 6–9 AM71%(111 flights)
- 9 AM–12 PM92%(234 flights)
Jun 83% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 53% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 77% | 30 |
| October 2025 | 86% | 29 |
| November 2025 | 83% | 23 |
| December 2025 | 90% | 31 |
| January 2026 | 88% | 24 |
| February 2026 | 100% | 25 |
| March 2026 | 94% | 31 |
| April 2026 | 97% | 30 |
| May 2026 | 94% | 31 |
Keep nerding
Based on 347 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.