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Route on-time record

SAN to STS: most on-time flights and the best time to fly

San Diego (San Diego International Airport) to Santa Rosa (Charles M. Schulz Sonoma County Airport). 904 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 3.1% were cancelled. The most reliable flight number was SkyWest 3445 at 7:59 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

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SAN → STS

San Diego to Santa Rosa: 904 nonstop flights a year

On time (12 months)

78%

Cancelled

3.1%

avg delay 11 min

Best time to leave

3 to 6 PM

90% on time vs 58% 6 to 9 PM

Most reliable airline

SkyWest

77% chance on time

Check SAN to STS fares

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. #1 · SkyWest 3445 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:59 AM → 10:03 AM2h 03m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    81%

    chance on time

    On time (history)
    83%
    Cancelled
    1.8%
    Avg arrival delay
    8 min
    • Arrived on time 83% of the time (211 flights, Jun 2025 to May 2026).
    • Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.

    Strong track record · 211 flights

    Find 7:59 AM flight fares Opens this date on Aviasales

  2. #2 · Southwest 388

    8:30 AM → 10:20 AM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    80%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 93% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
    • Short track record (30 flights), so its score leans on the airline's record at this hour.

    Limited track record · 30 flights

    Find Southwest 388 fares Opens this date on Aviasales

  3. #3 · SkyWest 3225 · sold as United Express, Delta Connection, American Eagle or Alaska

    12:12 PM → 2:13 PM2h 01m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    79%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 95% of the time (19 flights, Jun 2025 to May 2026).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
    • Short track record (19 flights), so its score leans on the airline's record at this hour.

    Limited track record · 19 flights

    Find 12:12 PM flight fares Opens this date on Aviasales

  4. #4 · SkyWest 3302 · sold as United Express, Delta Connection, American Eagle or Alaska

    9:14 PM → 11:13 PM1h 59m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    75%

    chance on time

    On time (history)
    80%
    Cancelled
    7.4%
    Avg arrival delay
    9 min
    • Arrived on time 80% of the time (247 flights, Jun 2025 to May 2026).
    • Cancelled 7.4% of the time (20 of 269).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).

    Strong track record · 247 flights

    Find 9:14 PM flight fares Opens this date on Aviasales

  5. #5 · Southwest 2019

    8:55 PM → 10:40 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    57%

    chance on time

    On time (history)
    55%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 55% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 58% on time; 3 to 6 PM: 90%).
    • Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).

    Limited track record · 55 flights

    Find Southwest 2019 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)77%

    818 flights · 79% on time as flown · 3.4% cancel

  • Southwest Airlines70%

    86 flights · 69% on time as flown · 2.0% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM83%

    227 flights · avg delay 9 min

  • 9 AM to noon82%

    83 flights · avg delay 9 min

  • Noon to 3 PM71%

    188 flights · avg delay 16 min

  • 3 to 6 PM90%

    63 flights · avg delay 6 min

  • 6 to 9 PM58%

    48 flights · avg delay 20 min

  • After 9 PM79%

    295 flights · avg delay 9 min

Best day: Tuesday (86%). Worst: Friday (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.

J
80
F
76
M
80
A
80
M
83
J
79
J
83
A
80
S
80
O
77
N
67
D
63

What delays this route

  • Late-arriving aircraft46%
  • Air traffic control and airport volume28%
  • Airline (crew, maintenance, boarding)21%
  • 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

Finding the most reliable connections from SAN to STS…

SAN to STS questions

What time of day is best to fly SAN to STS?
3 to 6 PM: 90% of flights arrived on time, against 58% for departures 6 to 9 PM.
Which airline is most on time from SAN to STS?
SkyWest, with a season-adjusted 77% chance of operating and arriving on time over 818 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 SAN to STS?
December (63% on time); the best was July (83%), 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 SAN

Live status: FAA delays and ground stops