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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

MDW → LAS

Chicago to Las Vegas: 2,405 nonstop flights a year

On time (12 months)

77%

Cancelled

1.0%

avg delay 13 min

Best time to leave

Before 9 AM

91% on time vs 53% after 9 PM

Most reliable airline

Southwest

76% chance on time

Check MDW to LAS fares

Lowest nonstop fare seen in the next two months: $165 (Southwest 2949 on 2026-11-13). 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 3285

    7:50 AM → 9:50 AM4h 00m nonstop

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

    91%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 96% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 54 flights

    Find Southwest 3285 fares Opens this date on Aviasales

  2. #2 · Southwest 4200

    5:00 AM → 7:05 AM4h 05m nonstop

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

    91%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (20 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Short track record (20 flights), so its score leans on the airline's record at this hour.

    Limited track record · 20 flights

    Find Southwest 4200 fares Opens this date on Aviasales

  3. #3 · Southwest 2668

    6:30 AM → 8:45 AM4h 15m nonstop

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

    89%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (18 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Short track record (18 flights), so its score leans on the airline's record at this hour.

    Limited track record · 18 flights

    Find Southwest 2668 fares Opens this date on Aviasales

  4. #4 · Southwest 1181

    7:15 AM → 9:25 AM4h 10m nonstop

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

    89%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (20 flights), so its score leans on the airline's record at this hour.

    Limited track record · 20 flights

    Find Southwest 1181 fares Opens this date on Aviasales

  5. #5 · Southwest 1859

    5:10 AM → 7:05 AM3h 55m nonstop

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

    88%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 91% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 1859 fares Opens this date on Aviasales

  6. #6 · Southwest 3916

    6:10 AM → 8:05 AM3h 55m nonstop

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

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 88% of the time (24 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find Southwest 3916 fares Opens this date on Aviasales

  7. #7 · Southwest 1923

    10:05 AM → 12:00 PM3h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2793, 120; its record covers all of them.

    80%

    chance on time

    On time (history)
    80%
    Cancelled
    1.3%
    Avg arrival delay
    13 min
    • Arrived on time 80% of the time (74 flights, Jun 2025 to May 2026).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 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 · 74 flights

    Find Southwest 1923 fares Opens this date on Aviasales

  8. #8 · Southwest 1475

    10:15 AM → 12:10 PM3h 55m nonstop

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

    79%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 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 1475 fares Opens this date on Aviasales

  9. #9 · Southwest 169

    1:00 PM → 2:55 PM3h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    79%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 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.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 169 fares Opens this date on Aviasales

  10. #10 · Southwest 3981

    12:10 PM → 2:05 PM3h 55m nonstop

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

    78%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 81% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.

    Limited track record · 31 flights

    Find Southwest 3981 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines76%

    2,388 flights · 77% on time as flown · 0.9% cancel

On time by departure time

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

  • Before 9 AM91%

    677 flights · avg delay 5 min

  • 9 AM to noon83%

    454 flights · avg delay 10 min

  • Noon to 3 PM76%

    359 flights · avg delay 12 min

  • 3 to 6 PM68%

    420 flights · avg delay 20 min

  • 6 to 9 PM64%

    341 flights · avg delay 21 min

  • After 9 PM53%

    154 flights · avg delay 30 min

Best day: Wednesday (80%). Worst: Friday (74%).

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