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Route on-time record

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

Atlanta (Hartsfield Jackson Atlanta International Airport) to Las Vegas (Harry Reid International Airport). 4,843 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Southwest 245 at 6:10 AM.

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

ATL → LAS

Atlanta to Las Vegas: 4,843 nonstop flights a year

On time (12 months)

75%

Cancelled

0.9%

avg delay 16 min

Best time to leave

Before 9 AM

89% on time vs 65% 6 to 9 PM

Most reliable airline

Spirit

78% chance on time

Check ATL to LAS 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 · Southwest 245

    6:10 AM → 7:40 AM4h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 300; its record covers all of them.

    93%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 96% of the time (72 flights, Jun 2025 to May 2026).
    • Never cancelled in 72 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 65%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Moderate track record · 72 flights

    Find Southwest 245 fares Opens this date on Aviasales

  2. #2 · Southwest 1748

    7:10 AM → 8:40 AM4h 30m nonstop

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

    86%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 65%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 1748 fares Opens this date on Aviasales

  3. #3 · Delta 777

    8:55 AM → 10:26 AM4h 31m nonstop

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

    84%

    chance on time

    On time (history)
    84%
    Cancelled
    0.9%
    Avg arrival delay
    9 min
    • Arrived on time 84% of the time (338 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 65%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 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.

    Strong track record · 338 flights

    Find Delta 777 fares Opens this date on Aviasales

  4. #4 · Delta 824

    7:25 AM → 12:18 PM4h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Delta 1327; its record covers all of them.

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.8%
    Avg arrival delay
    10 min
    • Arrived on time 83% of the time (131 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 65%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 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 · 131 flights

    Find Delta 824 fares Opens this date on Aviasales

  5. #5 · Delta 945

    9:20 AM → 10:40 AM4h 25m nonstop

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

    80%

    chance on time

    On time (history)
    81%
    Cancelled
    1.8%
    Avg arrival delay
    12 min
    • Arrived on time 81% of the time (109 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 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 · 109 flights

    Find Delta 945 fares Opens this date on Aviasales

  6. #6 · Delta 549

    12:19 PM → 1:50 PM4h 22m nonstop

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

    80%

    chance on time

    On time (history)
    80%
    Cancelled
    0.3%
    Avg arrival delay
    12 min
    • Arrived on time 80% of the time (347 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 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.

    Strong track record · 347 flights

    Find Delta 549 fares Opens this date on Aviasales

  7. #7 · Delta 748

    2:02 PM → 3:30 PM4h 28m nonstop

    Local times, typical schedule. Last flown 2026-05-06.

    79%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 82% of the time (60 flights, Jun 2025 to May 2026).
    • Never cancelled in 60 scheduled flights.
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • 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 · 60 flights

    Find Delta 748 fares Opens this date on Aviasales

  8. #8 · Delta 466

    10:39 AM → 12:09 PM4h 30m nonstop

    Local times, typical schedule. Last flown 2026-04-12.

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    0.3%
    Avg arrival delay
    10 min
    • Arrived on time 78% of the time (310 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 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.

    Strong track record · 310 flights

    Find Delta 466 fares Opens this date on Aviasales

  9. #9 · Southwest 551

    8:00 PM → 9:40 PM4h 40m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    75%

    chance on time

    On time (history)
    84%
    Cancelled
    3.0%
    Avg arrival delay
    16 min
    • Arrived on time 84% of the time (32 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (1 of 33).
    • Leaves in this route's least on-time window (6 to 9 PM: 65% on time; Before 9 AM: 89%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Limited track record · 32 flights

    Find Southwest 551 fares Opens this date on Aviasales

  10. #10 · Delta 711

    6:11 PM → 7:40 PM4h 28m nonstop

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

    73%

    chance on time

    On time (history)
    73%
    Cancelled
    0.3%
    Avg arrival delay
    17 min
    • Arrived on time 73% of the time (359 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 65% on time; Before 9 AM: 89%).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 359 flights

    Find Delta 711 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Spirit Airlines78%

    223 flights · 79% on time as flown · 0.9% cancel

  • Southwest Airlines77%

    720 flights · 77% on time as flown · 0.4% cancel

  • Delta Air Lines75%

    3,356 flights · 76% on time as flown · 0.8% cancel

  • Frontier Airlines63%

    544 flights · 63% on time as flown · 2.4% cancel

On time by departure time

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

  • Before 9 AM89%

    909 flights · avg delay 6 min

  • 9 AM to noon77%

    849 flights · avg delay 15 min

  • Noon to 3 PM80%

    527 flights · avg delay 12 min

  • 3 to 6 PM73%

    833 flights · avg delay 17 min

  • 6 to 9 PM65%

    1,264 flights · avg delay 24 min

  • After 9 PM67%

    461 flights · avg delay 23 min

Best day: Wednesday (80%). Worst: Sunday (71%).

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
75
F
75
M
80
A
72
M
68
J
66
J
61
A
72
S
77
O
82
N
82
D
83

What delays this route

  • Airline (crew, maintenance, boarding)44%
  • Late-arriving aircraft30%
  • Air traffic control and airport volume21%
  • Severe weather5%

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

ATL to LAS questions

What time of day is best to fly ATL to LAS?
Before 9 AM: 89% of flights arrived on time, against 65% 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 ATL to LAS?
Spirit, with a season-adjusted 78% chance of operating and arriving on time over 223 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 ATL to LAS?
July (61% on time); the best was December (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 ATL

Live status: FAA delays and ground stops