Best Time to Fly CVG to SEA: On-Time Stats by Hour & Airline
Cincinnati/Northern Kentucky International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.2% of Cincinnati (CVG) to Seattle (SEA) flights arrived on time (793 scheduled flights). That is 1.4 points below the national average of 77.6%.
Delta Air Lines was the most punctual of the 2 airlines on the route at 85.0%, while Alaska Airlines trailed at 68.7%.
October has been the best month (89% on time) and Thursday the weakest day of the week (72%).
1.0% of flights were cancelled, versus 1.8% nationally.
CVG 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 |
|---|---|---|---|---|
| Delta Air Lines | 85.0% | 53 min | 0.6% | 362 |
| Alaska Airlines | 68.7% | 56 min | 1.4% | 431 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CVG to SEA
On-time arrival % by scheduled departure hour (local time), 1,542 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 82.7% | 0.6% | 355 |
| 7am–8am | 87.9% | 0.0% | 266 |
| 8am–9am | 56.7% | 2.9% | 138 |
| 3pm–4pm | Limited data | 4 | |
| 4pm–5pm | Limited data | 14 | |
| 5pm–6pm | 81.8% | 0.0% | 88 |
| 6pm–7pm | 75.0% | 0.7% | 593 |
| 7pm–8pm | 69.9% | 1.2% | 84 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CVG 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 | 24 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 64.4% | -14.6 pts | 1.7% | 60 |
| Summer peak (Jun 15 - Aug 15) | 76.0% | -3.0 pts | 0.3% | 355 |
| All other days | 79.0% | — | 0.9% | 1,103 |
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).