85% of flights from Seattle to Cincinnati arrived on time over the past 12 months. That is better than the typical U.S. route. The 11 a.m. departures ran on time 88% of the time; the 10 a.m. ones 81%. Most reliable airline: Delta Air Lines (88%). 5% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SEA → CVG: when a flight was late, it was under 45 minutes late 70% of the time. About 1 in 34 flights landed an hour or more late, and 1 in 397 three hours or more; 1.1% were cancelled outright.
- On time or early85%
- 15–30 min late6.6%
- 30–60 min late4.2%
- 1–2 hours late2.0%
- 2–3 hours late0.6%
- 3+ hours late0.3%
- Diverted0.5%
- Cancelled1.1%
Share of all 793 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Alaska Airlines | 431 | 82% | 1.2% | −10 min | 2.3% | +40 min | Alaska Airlines |
| Delta Air Lines | 362 | 88% | 1.1% | −14 min | 3.6% | +59 min | Delta Air Lines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SEA). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Alaska Airlines | Delta Air Lines |
|---|---|---|
| 10 a.m. | 81% | — |
| 11 a.m. | — | 88% |
By month
Each calendar month pooled over 2023–2026. Best: November (90%). Worst: August (74%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 116 | 86% | 0.0% |
| Tuesday | 114 | 87% | 0.0% |
| Wednesday | 114 | 89% | 0.0% |
| Thursday | 112 | 87% | 0.0% |
| Friday | 113 | 85% | 3.5% |
| Saturday | 110 | 87% | 0.9% |
| Sunday | 114 | 73% | 3.5% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 5 · airline 4
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| AS 508 | 8:39 a.m. | 348 | 82% | 1.4% | −10 min | Alaska Airlines |
| DL 558 | 11:45 a.m. | 346 | 88% | 0.9% | −14 min | Delta Air Lines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Aug 11, 2026 | 3 | 33% | 0 |
| Jul 30, 2026 | 3 | 33% | 0 |
| Aug 13, 2026 | 3 | 33% | 0 |
| Jul 7, 2026 | 3 | 33% | 0 |
| Aug 16, 2026 | 3 | 33% | 1 |
Questions
How often are flights from SEA to CVG on time?
85% of 793 scheduled flights from Seattle, WA to Cincinnati, OH arrived within 15 minutes of schedule between September 2025 and August 2026. 1.1% were cancelled.
What is the best time of day to fly SEA to CVG?
Flights scheduled to leave at 11 a.m. were the most reliable (88% on time). The 10 a.m. departures were the least (81%).
Which airline is most on time from SEA to CVG?
Delta Air Lines: 88% of its 362 flights on the route arrived on time. Alaska Airlines: 82%.
What month has the most delays from SEA to CVG?
August (74% on time). The best month is November (90%), over 2023–2026.
Related
- CVG → SEA (return)
- Seattle-Tacoma (SEA) delays by hour
- Flights into Cincinnati Northern Kentucky (CVG)
- Alaska Airlines on-time record
- Delta Air Lines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.