Route on-time record
PIT to SEA: most on-time flights and the best time to fly
Pittsburgh (Pittsburgh International Airport) to Seattle (Seattle–Tacoma International Airport). 471 nonstop flights in Jun 2025 to May 2026, 69% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was Alaska 568 at 7:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PIT → SEA
Pittsburgh to Seattle: 471 nonstop flights a year
On time (12 months)
69%
Cancelled
1.3%
avg delay 18 min
Best time to leave
Before 9 AM
77% on time vs 64% 6 to 9 PM
Most reliable airline
Alaska
68% 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 568
7:00 AM → 9:22 AM5h 22m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 95% of the time (19 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 77% on time; 6 to 9 PM: 64%).
Limited track record · 19 flights
Find Alaska 568 fares Opens this date on Aviasales#2 · Alaska 412
7:24 PM → 9:46 PM5h 22m nonstop
Local times, typical schedule. Last flown 2026-05-31.
64%
chance on time
- On time (history)
- 65%
- Cancelled
- 0.6%
- Avg arrival delay
- 20 min
- Arrived on time 65% of the time (307 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 64% on time; Before 9 AM: 77%).
- 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 · 307 flights
Find Alaska 412 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines68%
471 flights · 69% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM77%
159 flights · avg delay 14 min
- 6 to 9 PM64%
312 flights · avg delay 20 min
Best day: Wednesday (82%). Worst: Thursday (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 aircraft53%
- Air traffic control and airport volume25%
- Airline (crew, maintenance, boarding)17%
- Severe weather5%
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
PIT to SEA questions
- What time of day is best to fly PIT to SEA?
- Before 9 AM: 77% of flights arrived on time, against 64% 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 PIT to SEA?
- Alaska, with a season-adjusted 68% chance of operating and arriving on time over 471 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 PIT to SEA?
- June (62% on time); the best was September (88%), 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 PIT
- SEA to PIT (return)
- PIT to ORD 78%
- PIT to LGA 80%
- PIT to ATL 90%
- PIT to MCO 79%
- PIT to BOS 79%
- PIT to CLT 84%
- PIT to EWR 87%
- PIT to JFK 87%
- PIT to DEN 81%
- PIT to DFW 79%
- PIT to DCA 69%
- PIT to IAD 88%
Most on-time flights from PIT on every route →
Live status: FAA delays and ground stops