Best Time to Fly SEA to CHS: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Charleston AFB/International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 87.2% of Seattle (SEA) to Charleston (CHS) flights arrived on time (347 scheduled flights). That is 9.6 points above the national average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
February has been the best month (98% on time) and Thursday the weakest day of the week (79%).
0.3% of flights were cancelled, versus 1.8% nationally.
SEA to CHS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlines | 87.2% | 43 min | 0.3% | 347 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to CHS
On-time arrival % by scheduled departure hour (local time), 696 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 75.4% | 1.1% | 183 |
| 9am–10am | 84.8% | 0.5% | 443 |
| 10am–11am | 90.0% | 0.0% | 70 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to CHS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 12 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 83.3% | -1.9 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 72.5% | -12.7 pts | 1.6% | 124 |
| All other days | 85.2% | — | 0.4% | 530 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).