Route Reliability
Charleston → Seattle
CHS–SEA · 2,415 miles · Charleston International Airport to Seattle–Tacoma International Airport
- 71%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 0.9%
- 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 71% of the time across 347 flights. No comparison to make.
What the data says
Mondays have been rough.
CHS–SEA flights arrived on time 81% of the time on Saturdays and just 62% on Mondays. That gap is worth planning around.
Trending in the right direction.
CHS–SEA flights arrived on time 77% of the time over the last three months in the data, compared with 69% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon62%(52 flights)
- Tue71%(42 flights)
- Wed73%(52 flights)
- Thu70%(50 flights)
- Fri69%(52 flights)
- Sat81%(43 flights)
- Sun70%(53 flights)
Jun 63% → May 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 63% | 30 |
| July 2025 | 53% | 30 |
| August 2025 | 71% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 69% | 29 |
| November 2025 | 70% | 23 |
| December 2025 | 55% | 31 |
| January 2026 | 67% | 24 |
| February 2026 | 84% | 25 |
| March 2026 | 74% | 31 |
| April 2026 | 77% | 30 |
| May 2026 | 80% | 30 |
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.