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Route on-time record

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

San Francisco (San Francisco International Airport) to Las Vegas (Harry Reid International Airport). 6,055 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was Southwest 4213 at 5:05 AM.

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

SFO → LAS

San Francisco to Las Vegas: 6,055 nonstop flights a year

On time (12 months)

76%

Cancelled

0.7%

avg delay 17 min

Best time to leave

Before 9 AM

93% on time vs 68% 3 to 6 PM

Most reliable airline

United

80% chance on time

Check SFO to LAS fares

Lowest nonstop fare seen in the next two months: $24 (Frontier 1850 on 2026-11-17). 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 · Southwest 4213

    5:05 AM → 6:40 AM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3026; its record covers all of them.

    92%

    chance on time

    On time (history)
    93%
    Cancelled
    1.2%
    Avg arrival delay
    2 min
    • Arrived on time 93% of the time (81 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs outside SFO's trouble window (7 AM to 1 PM, when 61% of its 333 ground stops and delay programs started).

    Moderate track record · 81 flights

    Find Southwest 4213 fares Opens this date on Aviasales

  2. #2 · United 582

    6:00 AM → 7:46 AM1h 46m nonstop

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

    92%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs outside SFO's trouble window (7 AM to 1 PM, when 61% of its 333 ground stops and delay programs started).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find United 582 fares Opens this date on Aviasales

  3. #3 · United 2492

    8:10 AM → 9:57 AM1h 47m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    90%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 91% of the time (259 flights, Jun 2025 to May 2026).
    • Never cancelled in 259 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Strong track record · 259 flights

    Find United 2492 fares Opens this date on Aviasales

  4. #4 · Alaska 718

    7:20 AM → 9:02 AM1h 42m nonstop

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

    88%

    chance on time

    On time (history)
    90%
    Cancelled
    2.7%
    Avg arrival delay
    7 min
    • Arrived on time 90% of the time (284 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Strong track record · 284 flights

    Find Alaska 718 fares Opens this date on Aviasales

  5. #5 · Southwest 127

    6:25 AM → 7:55 AM1h 30m nonstop

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

    87%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs outside SFO's trouble window (7 AM to 1 PM, when 61% of its 333 ground stops and delay programs started).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 127 fares Opens this date on Aviasales

  6. #6 · Southwest 2569

    8:05 AM → 9:35 AM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    86%

    chance on time

    On time (history)
    84%
    Cancelled
    2.6%
    Avg arrival delay
    8 min
    • Arrived on time 84% of the time (38 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (38 flights), so its score leans on the airline's record at this hour.

    Limited track record · 38 flights

    Find Southwest 2569 fares Opens this date on Aviasales

  7. #7 · United 1995

    7:08 PM → 8:59 PM1h 51m nonstop

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

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 83% of the time (323 flights, Jun 2025 to May 2026).
    • Never cancelled in 325 scheduled flights.
    • Departs outside SFO's trouble window (7 AM to 1 PM, when 61% of its 333 ground stops and delay programs started).

    Strong track record · 323 flights

    Find United 1995 fares Opens this date on Aviasales

  8. #8 · Southwest 3502

    7:35 AM → 9:05 AM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-04-05.

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 84% of the time (49 flights, Jun 2025 to May 2026).
    • Never cancelled in 49 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 68%).
    • Departs inside SFO's trouble window: 61% of its 333 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 49 flights

    Find Southwest 3502 fares Opens this date on Aviasales

  9. #9 · United 2400

    11:15 PM → 12:58 AM1h 51m nonstop

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

    82%

    chance on time

    On time (history)
    80%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 80% of the time (129 flights, Jun 2025 to May 2026).
    • Never cancelled in 129 scheduled flights.
    • Departs outside SFO's trouble window (7 AM to 1 PM, when 61% of its 333 ground stops and delay programs started).

    Moderate track record · 129 flights

    Find United 2400 fares Opens this date on Aviasales

  10. #10 · Alaska 634

    1:12 PM → 2:54 PM1h 42m nonstop

    Local times, typical schedule. Last flown 2026-03-17.

    79%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 89% of the time (63 flights, Jun 2025 to May 2026).
    • Never cancelled in 63 scheduled flights.
    • Departs outside SFO's trouble window (7 AM to 1 PM, when 61% of its 333 ground stops and delay programs started).
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Moderate track record · 63 flights

    Find Alaska 634 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines80%

    2,733 flights · 81% on time as flown · 0.4% cancel

  • Alaska Airlines76%

    1,134 flights · 77% on time as flown · 0.9% cancel

  • Southwest Airlines69%

    1,313 flights · 69% on time as flown · 0.5% cancel

  • Frontier Airlines68%

    873 flights · 68% on time as flown · 1.3% cancel

On time by departure time

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

  • Before 9 AM93%

    1,498 flights · avg delay 6 min

  • 9 AM to noon68%

    845 flights · avg delay 18 min

  • Noon to 3 PM70%

    913 flights · avg delay 21 min

  • 3 to 6 PM68%

    1,083 flights · avg delay 23 min

  • 6 to 9 PM75%

    920 flights · avg delay 17 min

  • After 9 PM71%

    796 flights · avg delay 22 min

Best day: Saturday (81%). Worst: Thursday (68%).

Smarter routing

Nearby airports that run more on time

  • OAK → LAS 79% chance on time

    Oakland San Francisco Bay Airport to Harry Reid International Airport · 3,412 flights a year · 11 mi from your airports · yours: 75%

    Rank flightsFares

  • SJC → LAS 79% chance on time

    Norman Y. Mineta San Jose International Airport to Harry Reid International Airport · 3,941 flights a year · 30 mi from your airports · yours: 75%

    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
78
F
74
M
71
A
68
M
68
J
73
J
73
A
77
S
76
O
75
N
78
D
76

What delays this route

  • Late-arriving aircraft55%
  • Airline (crew, maintenance, boarding)25%
  • Air traffic control and airport volume19%
  • 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

SFO to LAS questions

What time of day is best to fly SFO to LAS?
Before 9 AM: 93% of flights arrived on time, against 68% for departures 3 to 6 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 SFO to LAS?
United, with a season-adjusted 80% 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 SFO to LAS?
May (68% on time); the best was January (78%), 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 SFO

Live status: FAA delays and ground stops