76% of flights from Cincinnati to Seattle arrived on time over the past 12 months. That is worse than the typical U.S. route. The 7 a.m. departures ran on time 87% of the time; the 6 p.m. ones 69%. Most reliable airline: Delta Air Lines (83%). 7% 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 CVG → SEA: when a flight was late, it was under 45 minutes late 68% of the time. About 1 in 19 flights landed an hour or more late, and 1 in 88 three hours or more; 1.4% were cancelled outright.
- On time or early76%
- 15–30 min late11%
- 30–60 min late6.8%
- 1–2 hours late3.0%
- 2–3 hours late1.1%
- 3+ hours late1.1%
- Diverted0.0%
- Cancelled1.4%
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 | 70% | 1.9% | −1 min | 7.0% | +57 min | Alaska Airlines |
| Delta Air Lines | 362 | 83% | 0.8% | −7 min | 3.3% | +52 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 CVG). 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 |
|---|---|---|
| 6 a.m. | — | 81% |
| 6 p.m. | 69% | — |
By month
Each calendar month pooled over 2023–2026. Best: October (91%). Worst: December (71%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 116 | 70% | 1.7% |
| Tuesday | 114 | 82% | 0.0% |
| Wednesday | 114 | 81% | 1.8% |
| Thursday | 112 | 71% | 1.8% |
| Friday | 113 | 74% | 0.0% |
| Saturday | 110 | 80% | 2.7% |
| Sunday | 114 | 74% | 1.8% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 6 · airline 5
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 |
|---|---|---|---|---|---|---|
| DL 966 | 6:35 a.m. | 346 | 84% | 0.6% | −8 min | Delta Air Lines |
| AS 508 | 5:07 p.m. | 278 | 71% | 1.1% | −2 min | Alaska Airlines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jun 17, 2026 | 3 | 33% | 0 |
| Jul 6, 2026 | 3 | 33% | 0 |
| Jun 12, 2026 | 3 | 33% | 0 |
| Jul 8, 2026 | 3 | 33% | 0 |
| Jun 15, 2026 | 3 | 33% | 0 |
Questions
How often are flights from CVG to SEA on time?
76% of 793 scheduled flights from Cincinnati, OH to Seattle, WA arrived within 15 minutes of schedule between September 2025 and August 2026. 1.4% were cancelled.
What is the best time of day to fly CVG to SEA?
Flights scheduled to leave at 7 a.m. were the most reliable (87% on time). The 6 p.m. departures were the least (69%).
Which airline is most on time from CVG to SEA?
Delta Air Lines: 83% of its 362 flights on the route arrived on time. Alaska Airlines: 70%.
What month has the most delays from CVG to SEA?
December (71% on time). The best month is October (91%), over 2023–2026.
Related
- SEA → CVG (return)
- Cincinnati Northern Kentucky (CVG) delays by hour
- Flights into Seattle-Tacoma (SEA)
- 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.