Best Time to Fly CHS to SEA: On-Time Stats by Hour & Airline
Charleston AFB/International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
347 flights were scheduled from Charleston (CHS) to Seattle (SEA) in the last 12 months, and 73.9% of those that flew arrived on time, 3.7 points below the US average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
February has been the best month (86% on time) and Monday the weakest day of the week (69%).
0.6% of flights were cancelled, versus 1.8% nationally.
CHS to SEA 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 | 73.9% | 39 min | 0.6% | 347 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CHS to SEA
On-time arrival % by scheduled departure hour (local time), 696 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6pm–7pm | 74.2% | 0.9% | 583 |
| 7pm–8pm | 71.2% | 1.8% | 113 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CHS to SEA
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) | 76.7% | +2.2 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 70.2% | -4.2 pts | 2.4% | 124 |
| All other days | 74.5% | — | 0.8% | 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).