Route on-time record
CMH to SEA: most on-time flights and the best time to fly
Columbus (John Glenn Columbus International Airport) to Seattle (Seattle–Tacoma International Airport). 467 nonstop flights in Jun 2025 to May 2026, 70% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was Alaska 456 at 7:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
CMH → SEA
Columbus to Seattle: 467 nonstop flights a year
On time (12 months)
70%
Cancelled
1.3%
avg delay 17 min
Best time to leave
Before 9 AM
82% on time vs 63% 6 to 9 PM
Most reliable airline
Alaska
69% chance on time
Lowest nonstop fare seen in the next two months: $299 (Alaska 1639 on 2026-10-29). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Alaska 456
7:00 AM → 9:12 AM5h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 78% of the time (18 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 82% on time; 6 to 9 PM: 63%).
Limited track record · 18 flights
Find Alaska 456 fares Opens this date on Aviasales#2 · Alaska 450
7:30 PM → 9:43 PM5h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
63%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.7%
- Avg arrival delay
- 20 min
- Arrived on time 63% of the time (292 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 63% on time; Before 9 AM: 82%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 292 flights
Find Alaska 450 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines69%
463 flights · 70% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM82%
157 flights · avg delay 10 min
- 6 to 9 PM63%
306 flights · avg delay 20 min
Best day: Tuesday (83%). Worst: Sunday (73%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft40%
- Air traffic control and airport volume28%
- Airline (crew, maintenance, boarding)22%
- Severe weather10%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
CMH to SEA questions
- What time of day is best to fly CMH to SEA?
- Before 9 AM: 82% of flights arrived on time, against 63% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from CMH to SEA?
- Alaska, with a season-adjusted 69% chance of operating and arriving on time over 463 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on CMH to SEA?
- December (70% on time); the best was November (91%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from CMH
- SEA to CMH (return)
- CMH to ORD 74%
- CMH to ATL 86%
- CMH to LGA 78%
- CMH to MCO 78%
- CMH to DCA 68%
- CMH to CLT 83%
- CMH to BOS 81%
- CMH to EWR 82%
- CMH to DEN 78%
- CMH to DFW 78%
- CMH to JFK 83%
- CMH to DTW 85%
Most on-time flights from CMH on every route →
Live status: FAA delays and ground stops