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Route on-time record

SBP to SFO: most on-time flights and the best time to fly

San Luis Obispo (San Luis County Regional Airport) to San Francisco (San Francisco International Airport). 1,145 nonstop flights in Jun 2025 to May 2026, 65% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was United 1639 at 6:15 AM.

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

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SBP → SFO

San Luis Obispo to San Francisco: 1,145 nonstop flights a year

On time (12 months)

65%

Cancelled

1.0%

avg delay 25 min

Best time to leave

3 to 6 PM

95% on time vs 57% before 9 AM

Most reliable airline

United

71% chance on time

Check SBP to SFO 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 · United 1639

    6:15 AM → 7:20 AM1h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    83%

    chance on time

    On time (history)
    77%
    Cancelled
    0.0%
    Avg arrival delay
    28 min
    • Arrived on time 77% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Leaves in this route's least on-time window (Before 9 AM: 57% on time; 3 to 6 PM: 95%).
    • Lands inside SFO's trouble window: 60% of its 334 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 53 flights

    Find United 1639 fares Opens this date on Aviasales

  2. #2 · United 1205

    6:25 AM → 7:24 AM59m nonstop

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

    80%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (Before 9 AM: 57% on time; 3 to 6 PM: 95%).
    • Lands inside SFO's trouble window: 60% of its 334 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 11 flights

    Find United 1205 fares Opens this date on Aviasales

  3. #3 · SkyWest 5951 · sold as United Express, Delta Connection, American Eagle or Alaska

    2:12 PM → 3:25 PM1h 13m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    70%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 71% of the time (351 flights, Jun 2025 to May 2026).
    • Never cancelled in 351 scheduled flights.

    Strong track record · 351 flights

    Find 2:12 PM flight fares Opens this date on Aviasales

  4. #4 · United 1846

    2:06 PM → 3:07 PM1h 01m nonstop

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

    65%

    chance on time

    On time (history)
    18%
    Cancelled
    0.0%
    Avg arrival delay
    82 min
    • Arrived on time 18% of the time (11 flights, Jun 2025 to May 2026).

    Limited track record · 11 flights

    Find United 1846 fares Opens this date on Aviasales

  5. #5 · SkyWest 5713 · sold as United Express, Delta Connection, American Eagle or Alaska

    8:34 PM → 9:44 PM1h 10m nonstop

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

    51%

    chance on time

    On time (history)
    20%
    Cancelled
    9.1%
    Avg arrival delay
    59 min
    • Arrived on time 20% of the time (10 flights, Jun 2025 to May 2026).

    Limited track record · 10 flights

    Find 8:34 PM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 6035 · sold as United Express, Delta Connection, American Eagle or Alaska

    8:20 AM → 9:35 AM1h 12m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    43%

    chance on time

    On time (history)
    40%
    Cancelled
    1.1%
    Avg arrival delay
    37 min
    • Arrived on time 40% of the time (92 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (Before 9 AM: 57% on time; 3 to 6 PM: 95%).
    • Lands inside SFO's trouble window: 60% of its 334 ground stops and delay programs started between 7 AM and 1 PM.

    Moderate track record · 92 flights

    Find 8:20 AM flight fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines71%

    120 flights · 71% on time as flown · 1.0% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)63%

    1,025 flights · 65% on time as flown · 1.1% cancel

On time by departure time

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

  • Before 9 AM57%

    510 flights · avg delay 33 min

  • 9 AM to noon72%

    68 flights · avg delay 14 min

  • Noon to 3 PM69%

    362 flights · avg delay 20 min

  • 3 to 6 PM95%

    43 flights · avg delay 5 min

  • 6 to 9 PM71%

    162 flights · avg delay 26 min

Best day: Tuesday (79%). Worst: Friday (69%).

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
81
F
67
M
75
A
61
M
66
J
72
J
78
A
79
S
69
O
73
N
74
D
76

What delays this route

  • Air traffic control and airport volume45%
  • Airline (crew, maintenance, boarding)38%
  • Late-arriving aircraft9%
  • Severe weather8%

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 SBP to SFO…

SBP to SFO questions

What time of day is best to fly SBP to SFO?
3 to 6 PM: 95% of flights arrived on time, against 57% for departures before 9 AM.
Which airline is most on time from SBP to SFO?
United, with a season-adjusted 71% chance of operating and arriving on time over 120 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 SBP to SFO?
April (61% on time); the best was January (81%), 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 SBP

Live status: FAA delays and ground stops