Route on-time record
CLE to SEA: most on-time flights and the best time to fly
Cleveland (Cleveland Hopkins International Airport) to Seattle (Seattle–Tacoma International Airport). 459 nonstop flights in Jun 2025 to May 2026, 65% arrived within 15 minutes and 2.4% were cancelled. The most reliable flight number was Alaska 548 at 7:08 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
CLE → SEA
Cleveland to Seattle: 459 nonstop flights a year
On time (12 months)
65%
Cancelled
2.4%
avg delay 22 min
Best time to leave
Before 9 AM
76% on time vs 58% 6 to 9 PM
Most reliable airline
Alaska
63% chance on time
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 548
7:08 AM → 9:19 AM5h 11m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 82%
- Cancelled
- 1.7%
- Avg arrival delay
- 15 min
- Arrived on time 82% of the time (117 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 76% on time; 6 to 9 PM: 58%).
Moderate track record · 117 flights
Find Alaska 548 fares Opens this date on Aviasales#2 · Alaska 216
6:44 PM → 8:57 PM5h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31.
57%
chance on time
- On time (history)
- 58%
- Cancelled
- 2.2%
- Avg arrival delay
- 24 min
- Arrived on time 58% of the time (270 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 58% on time; Before 9 AM: 76%).
- 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 · 270 flights
Find Alaska 216 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines63%
459 flights · 65% on time as flown · 2.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM76%
181 flights · avg delay 18 min
- 6 to 9 PM58%
277 flights · avg delay 24 min
Best day: Tuesday (81%). Worst: Monday (70%).
Smarter routing
Or connect through a calmer hub
via LAX (Los Angeles International Airport)
75% both legs on time- CLE to LAX on time 89%, LAX to SEA on time 85%.
- LAX had 15 ground stops and delay programs in 12 months.
via IAH (George Bush Intercontinental Airport)
67% both legs on time- CLE to IAH on time 89%, IAH to SEA on time 76%.
- IAH had 92 ground stops and delay programs in 12 months.
Book connections on one ticket and allow at least an hour at the hub. Leg odds are combined as independent, a rough guide.
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 aircraft33%
- Air traffic control and airport volume30%
- Airline (crew, maintenance, boarding)30%
- Severe weather6%
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
CLE to SEA questions
- What time of day is best to fly CLE to SEA?
- Before 9 AM: 76% of flights arrived on time, against 58% 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 CLE to SEA?
- Alaska, with a season-adjusted 63% chance of operating and arriving on time over 459 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 CLE to SEA?
- January (58% on time); the best was September (87%), 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 CLE
- SEA to CLE (return)
- CLE to ORD 74%
- CLE to ATL 85%
- CLE to EWR 80%
- CLE to MCO 78%
- CLE to LGA 76%
- CLE to DEN 81%
- CLE to CLT 81%
- CLE to BOS 78%
- CLE to DFW 75%
- CLE to DCA 65%
- CLE to FLL 80%
- CLE to MDW 82%
Most on-time flights from CLE on every route →
Live status: FAA delays and ground stops