Route on-time record
STS to SEA: most on-time flights and the best time to fly
Santa Rosa (Charles M. Schulz Sonoma County Airport) to Seattle (Seattle–Tacoma International Airport). 481 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was Alaska 1481 at 6:53 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
STS → SEA
Santa Rosa to Seattle: 481 nonstop flights a year
On time (12 months)
71%
Cancelled
1.7%
avg delay 17 min
Best time to leave
Before 9 AM
81% on time vs 51% 6 to 9 PM
Most reliable airline
SkyWest
73% 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 1481
6:53 PM → 8:58 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-04-21.
74%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 80% of the time (35 flights, Jun 2025 to May 2026).
- Never cancelled in 35 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 51% on time; Before 9 AM: 81%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 35 flights
Find Alaska 1481 fares Opens this date on Aviasales#2 · SkyWest 3037 · sold as United Express, Delta Connection, American Eagle or Alaska
7:57 PM → 10:05 PM2h 08m nonstop
Local times, typical schedule. Last flown 2026-03-17.
72%
chance on time
- On time (history)
- 73%
- Cancelled
- 2.9%
- Avg arrival delay
- 13 min
- Arrived on time 73% of the time (33 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 51% on time; Before 9 AM: 81%).
- Short track record (33 flights), so its score leans on the airline's record at this hour.
Limited track record · 33 flights
Find 7:57 PM flight fares Opens this date on Aviasales#3 · Alaska 1321
1:09 PM → 3:16 PM2h 07m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 1322; its record covers all of them.
65%
chance on time
- On time (history)
- 63%
- Cancelled
- 1.6%
- Avg arrival delay
- 19 min
- Arrived on time 63% of the time (252 flights, Jun 2025 to May 2026).
- 50% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 252 flights
Find Alaska 1321 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)73%
125 flights · 73% on time as flown · 2.0% cancel
- Alaska Airlines69%
356 flights · 70% on time as flown · 1.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM81%
125 flights · avg delay 16 min
- Noon to 3 PM79%
178 flights · avg delay 10 min
- 6 to 9 PM51%
158 flights · avg delay 27 min
Best day: Saturday (82%). Worst: Monday (66%).
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 aircraft45%
- Air traffic control and airport volume32%
- Airline (crew, maintenance, boarding)21%
- Security1%
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
STS to SEA questions
- What time of day is best to fly STS to SEA?
- Before 9 AM: 81% of flights arrived on time, against 51% 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 STS to SEA?
- SkyWest, with a season-adjusted 73% chance of operating and arriving on time over 125 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 STS to SEA?
- August (66% on time); the best was March (84%), 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 STS
- SEA to STS (return)
- STS to SAN 76%
- STS to SNA 77%
- STS to PHX 78%
- STS to LAX 83%
- STS to PDX 90%
- STS to BUR 79%
Live status: FAA delays and ground stops