Columbus (CMH) to Seattle (SEA): On-Time Performance
Data through May 2026
The calendar drives reliability on CMH–SEA. November 2024 flights landed on schedule 97% of the time, but December 2025 dropped to 39% — a gap of 58 points. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 67%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 1.3
- last 12 months
- Duration
- 5h 9m
- scheduled
- Distance
- 2,016 mi
Monthly on-time trend
Best time to fly from CMH to SEA
Aim for departures around 9 a.m. (92% on-time); avoid 6 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 13 min |
| Tuesdaybest | 82% | 10 min |
| Wednesday | 77% | 12 min |
| Thursday | 71% | 13 min |
| Friday | 71% | 17 min |
| Saturday | 75% | 12 min |
| Sunday | 68% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations20%
- National airspace system28%
- Weather9%
Frequently asked questions
- How often are flights from CMH to SEA delayed?
- 26% of CMH–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 14 minutes.
- What is the best time of day to fly from CMH to SEA?
- Departures around 9 a.m. have the best record (92% on-time), while departures around 6 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from CMH to SEA?
- The scheduled CMH–SEA flight time averages 5h 9m over 2,016 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are CMH to SEA flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from CMH to SEA?
- December 2025 was the roughest month in this dataset, with only 39% of arrivals on time. The best was November 2024 at 97%. If your dates are flexible, that 58-point gap is worth planning around.
Explore related pages
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Based on 934 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.