Route on-time record
STS to PDX: most on-time flights and the best time to fly
Santa Rosa (Charles M. Schulz Sonoma County Airport) to Portland (Portland International Airport). 558 nonstop flights in Jun 2025 to May 2026, 90% arrived within 15 minutes and 1.6% were cancelled. The most reliable flight number was SkyWest 3045 at 7:02 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
STS → PDX
Santa Rosa to Portland: 558 nonstop flights a year
On time (12 months)
90%
Cancelled
1.6%
avg delay 9 min
Best time to leave
3 to 6 PM
92% on time vs 88% 6 to 9 PM
Most reliable airline
SkyWest
89% 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 · SkyWest 3045 · sold as United Express, Delta Connection, American Eagle or Alaska
7:02 PM → 8:45 PM1h 43m nonstop
Local times, typical schedule. Last flown 2026-04-20.
92%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 97% of the time (29 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 88% on time; 3 to 6 PM: 92%).
- Short track record (29 flights), so its score leans on the airline's record at this hour.
Limited track record · 29 flights
Find 7:02 PM flight fares Opens this date on Aviasales#2 · SkyWest 3417 · sold as United Express, Delta Connection, American Eagle or Alaska
7:50 AM → 9:38 AM1h 48m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 90% of the time (219 flights, Jun 2025 to May 2026).
- Never cancelled in 219 scheduled flights.
Strong track record · 219 flights
Find 7:50 AM flight fares Opens this date on Aviasales#3 · SkyWest 3081 · sold as United Express, Delta Connection, American Eagle or Alaska
11:50 AM → 1:34 PM1h 44m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
- 95% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find 11:50 AM flight fares Opens this date on Aviasales#4 · SkyWest 3371 · sold as United Express, Delta Connection, American Eagle or Alaska
2:56 PM → 4:39 PM1h 46m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 3419; its record covers all of them.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.7%
- Avg arrival delay
- 9 min
- Arrived on time 88% of the time (264 flights, Jun 2025 to May 2026).
Strong track record · 264 flights
Find 2:56 PM flight 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)89%
532 flights · 89% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
45 flights · avg delay 9 min
- 9 AM to noon91%
152 flights · avg delay 8 min
- Noon to 3 PM88%
99 flights · avg delay 10 min
- 3 to 6 PM92%
66 flights · avg delay 5 min
- 6 to 9 PM88%
196 flights · avg delay 10 min
Best day: Tuesday (90%). Worst: Sunday (80%).
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 aircraft64%
- Airline (crew, maintenance, boarding)19%
- Air traffic control and airport volume13%
- Severe weather4%
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 PDX questions
- What time of day is best to fly STS to PDX?
- 3 to 6 PM: 92% of flights arrived on time, against 88% for departures 6 to 9 PM.
- Which airline is most on time from STS to PDX?
- SkyWest, with a season-adjusted 89% chance of operating and arriving on time over 532 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 PDX?
- December (77% on time); the best was July (97%), 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
- PDX to STS (return)
- STS to SAN 76%
- STS to SNA 77%
- STS to PHX 78%
- STS to LAX 83%
- STS to BUR 79%
- STS to SEA 71%
Live status: FAA delays and ground stops