Best Time to Fly CMH to SEA: On-Time Stats by Hour & Airline
John Glenn Columbus International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
464 flights were scheduled from Columbus (CMH) to Seattle (SEA) in the last 12 months, and 71.9% of those that flew arrived on time, 5.7 points below the US average of 77.6%.
Alaska Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (80% on time) and December the worst month (63%).
The cancellation rate was 1.1% (US average 1.8%).
CMH 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 | 71.9% | 47 min | 1.1% | 460 |
| American Airlines | Limited data | 1 | ||
| Delta Air Lines | Limited data | 1 | ||
| United Airlines | Limited data | 1 | ||
| Southwest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CMH to SEA
On-time arrival % by scheduled departure hour (local time), 930 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 23 | |
| 7am–8am | 82.5% | 0.4% | 247 |
| 8am–9am | 80.0% | 7.4% | 54 |
| 9am–10am | 93.8% | 0.0% | 66 |
| 12pm–1pm | Limited data | 1 | |
| 2pm–3pm | Limited data | 2 | |
| 5pm–6pm | Limited data | 1 | |
| 6pm–7pm | 65.6% | 0.4% | 459 |
| 7pm–8pm | 68.4% | 1.3% | 77 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CMH 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 | 13 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 70.0% | -7.1 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 66.9% | -10.1 pts | 0.4% | 246 |
| All other days | 77.1% | — | 1.1% | 641 |
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).