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Route on-time record

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

Las Vegas (Harry Reid International Airport) to San Francisco (San Francisco International Airport). 6,044 nonstop flights in Jun 2025 to May 2026, 66% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was United 643 at 6:00 AM.

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

LAS → SFO

Las Vegas to San Francisco: 6,044 nonstop flights a year

On time (12 months)

66%

Cancelled

0.7%

avg delay 21 min

Best time to leave

Before 9 AM

76% on time vs 51% 6 to 9 PM

Most reliable airline

United

70% chance on time

Check LAS 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 643

    6:00 AM → 7:48 AM1h 47m nonstop

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

    96%

    chance on time

    On time (history)
    98%
    Cancelled
    0.7%
    Avg arrival delay
    1 min
    • Arrived on time 98% of the time (143 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 76% on time; 6 to 9 PM: 51%).
    • Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
    • Lands inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Moderate track record · 143 flights

    Find United 643 fares Opens this date on Aviasales

  2. #2 · Frontier 3019

    6:10 AM → 7:58 AM1h 49m nonstop

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

    82%

    chance on time

    On time (history)
    82%
    Cancelled
    1.2%
    Avg arrival delay
    10 min
    • Arrived on time 82% of the time (254 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 76% on time; 6 to 9 PM: 51%).
    • Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
    • Lands inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Strong track record · 254 flights

    Find Frontier 3019 fares Opens this date on Aviasales

  3. #3 · Alaska 1347

    4:58 PM → 6:41 PM1h 43m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    79%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 86% of the time (21 flights, Jun 2025 to May 2026).
    • Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
    • Short track record (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find Alaska 1347 fares Opens this date on Aviasales

  4. #4 · Alaska 239

    11:47 AM → 1:31 PM1h 44m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    77%

    chance on time

    On time (history)
    67%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 67% of the time (21 flights, Jun 2025 to May 2026).
    • Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
    • Short track record (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find Alaska 239 fares Opens this date on Aviasales

  5. #5 · United 548

    4:55 PM → 6:39 PM1h 44m nonstop

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

    74%

    chance on time

    On time (history)
    52%
    Cancelled
    0.0%
    Avg arrival delay
    48 min
    • Arrived on time 52% of the time (21 flights, Jun 2025 to May 2026).
    • Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
    • 84% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find United 548 fares Opens this date on Aviasales

  6. #6 · United 2047

    3:53 PM → 5:38 PM1h 45m nonstop

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

    73%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 74% of the time (363 flights, Jun 2025 to May 2026).
    • Never cancelled in 363 scheduled flights.
    • Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Strong track record · 363 flights

    Find United 2047 fares Opens this date on Aviasales

  7. #7 · Alaska 613

    9:19 AM → 11:04 AM1h 45m nonstop

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

    73%

    chance on time

    On time (history)
    75%
    Cancelled
    0.6%
    Avg arrival delay
    15 min
    • Arrived on time 75% of the time (322 flights, Jun 2025 to May 2026).
    • Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
    • Lands inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Strong track record · 322 flights

    Find Alaska 613 fares Opens this date on Aviasales

  8. #8 · United 1603

    6:00 PM → 7:45 PM1h 45m nonstop

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

    73%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 74% of the time (137 flights, Jun 2025 to May 2026).
    • Never cancelled in 137 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 51% on time; Before 9 AM: 76%).
    • Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).

    Moderate track record · 137 flights

    Find United 1603 fares Opens this date on Aviasales

  9. #9 · United 574

    10:59 AM → 12:55 PM1h 41m nonstop

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

    72%

    chance on time

    On time (history)
    72%
    Cancelled
    0.3%
    Avg arrival delay
    17 min
    • Arrived on time 72% of the time (303 flights, Jun 2025 to May 2026).
    • Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
    • Lands inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Strong track record · 303 flights

    Find United 574 fares Opens this date on Aviasales

  10. #10 · Southwest 1522

    11:00 AM → 12:45 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-04-01.

    69%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
    • Lands inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 1522 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines70%

    2,733 flights · 71% on time as flown · 0.5% cancel

  • Alaska Airlines67%

    1,133 flights · 68% on time as flown · 1.2% cancel

  • Frontier Airlines65%

    866 flights · 66% on time as flown · 1.3% cancel

  • Southwest Airlines54%

    1,309 flights · 53% on time as flown · 0.5% cancel

On time by departure time

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

  • Before 9 AM76%

    1,475 flights · avg delay 13 min

  • 9 AM to noon71%

    1,109 flights · avg delay 17 min

  • Noon to 3 PM66%

    744 flights · avg delay 20 min

  • 3 to 6 PM69%

    1,000 flights · avg delay 19 min

  • 6 to 9 PM51%

    1,276 flights · avg delay 33 min

  • After 9 PM54%

    440 flights · avg delay 24 min

Best day: Saturday (76%). Worst: Thursday (63%).

Smarter routing

Nearby airports that run more on time

  • LAS → SJC 78% chance on time

    Harry Reid International Airport to Norman Y. Mineta San Jose International Airport · 3,944 flights a year · 30 mi from your airports · yours: 65%

    Rank flightsFares

  • LAS → OAK 72% chance on time

    Harry Reid International Airport to Oakland San Francisco Bay Airport · 3,407 flights a year · 11 mi from your airports · yours: 65%

    Rank flightsFares

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
77
F
67
M
69
A
60
M
57
J
68
J
65
A
71
S
70
O
70
N
71
D
70

What delays this route

  • Air traffic control and airport volume51%
  • Late-arriving aircraft31%
  • Airline (crew, maintenance, boarding)16%
  • Severe weather1%

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

LAS to SFO questions

What time of day is best to fly LAS to SFO?
Before 9 AM: 76% 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 LAS to SFO?
United, with a season-adjusted 70% chance of operating and arriving on time over 2,733 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 LAS to SFO?
May (57% on time); the best was January (77%), 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 LAS

Live status: FAA delays and ground stops