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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.

FLL → MDW

Fort Lauderdale to Chicago: 1,133 nonstop flights a year

On time (12 months)

71%

Cancelled

1.4%

avg delay 17 min

Best time to leave

Before 9 AM

90% on time vs 54% 6 to 9 PM

Most reliable airline

Southwest

70% chance on time

Check FLL to MDW fares

Lowest nonstop fare seen in the next two months: $86 (Southwest 4823 on 2026-11-12). 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 1923

    6:55 AM → 9:05 AM3h 10m nonstop

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

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 89% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 54%).
    • Departs outside FLL's trouble window (1 PM to 7 PM, when 70% of its 20 ground stops and delay programs started).

    Limited track record · 55 flights

    Find Southwest 1923 fares Opens this date on Aviasales

  2. #2 · Southwest 1955

    6:45 AM → 9:00 AM3h 15m nonstop

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

    85%

    chance on time

    On time (history)
    90%
    Cancelled
    9.1%
    Avg arrival delay
    11 min
    • Arrived on time 90% of the time (30 flights, Jun 2025 to May 2026).
    • Cancelled 9.1% of the time (3 of 33).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 6 to 9 PM: 54%).
    • Departs outside FLL's trouble window (1 PM to 7 PM, when 70% of its 20 ground stops and delay programs started).

    Limited track record · 30 flights

    Find Southwest 1955 fares Opens this date on Aviasales

  3. #3 · Southwest 784

    9:25 AM → 11:40 AM3h 15m nonstop

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

    76%

    chance on time

    On time (history)
    100%
    Cancelled
    10.0%
    Avg arrival delay
    3 min
    • Arrived on time 100% of the time (9 flights, Jun 2025 to May 2026).
    • Departs outside FLL's trouble window (1 PM to 7 PM, when 70% of its 20 ground stops and delay programs started).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (9 flights), so its score leans on the airline's record at this hour.

    Limited track record · 9 flights

    Find Southwest 784 fares Opens this date on Aviasales

  4. #4 · Southwest 235

    11:45 AM → 2:00 PM3h 15m nonstop

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

    67%

    chance on time

    On time (history)
    59%
    Cancelled
    0.0%
    Avg arrival delay
    30 min
    • Arrived on time 59% of the time (17 flights, Jun 2025 to May 2026).
    • Departs outside FLL's trouble window (1 PM to 7 PM, when 70% of its 20 ground stops and delay programs started).
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (17 flights), so its score leans on the airline's record at this hour.

    Limited track record · 17 flights

    Find Southwest 235 fares Opens this date on Aviasales

  5. #5 · Southwest 2253

    2:40 PM → 5:00 PM3h 20m nonstop

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

    63%

    chance on time

    On time (history)
    53%
    Cancelled
    0.0%
    Avg arrival delay
    28 min
    • Arrived on time 53% of the time (15 flights, Jun 2025 to May 2026).
    • Departs inside FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 2253 fares Opens this date on Aviasales

  6. #6 · Southwest 1540

    2:20 PM → 4:30 PM3h 10m nonstop

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

    62%

    chance on time

    On time (history)
    59%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 59% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Departs inside FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (54 flights), so its score leans on the airline's record at this hour.

    Limited track record · 54 flights

    Find Southwest 1540 fares Opens this date on Aviasales

  7. #7 · Southwest 3440

    6:40 PM → 8:50 PM3h 10m nonstop

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

    59%

    chance on time

    On time (history)
    58%
    Cancelled
    1.9%
    Avg arrival delay
    21 min
    • Arrived on time 58% of the time (53 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 54% on time; Before 9 AM: 90%).
    • Departs inside FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (53 flights), so its score leans on the airline's record at this hour.

    Limited track record · 53 flights

    Find Southwest 3440 fares Opens this date on Aviasales

  8. #8 · Southwest 2373

    6:20 PM → 8:40 PM3h 20m nonstop

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

    49%

    chance on time

    On time (history)
    33%
    Cancelled
    3.0%
    Avg arrival delay
    43 min
    • Arrived on time 33% of the time (30 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: 54% on time; Before 9 AM: 90%).
    • Departs inside FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.

    Limited track record · 30 flights

    Find Southwest 2373 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines70%

    1,133 flights · 71% on time as flown · 1.4% cancel

On time by departure time

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

  • Before 9 AM90%

    364 flights · avg delay 8 min

  • 9 AM to noon76%

    94 flights · avg delay 14 min

  • Noon to 3 PM64%

    289 flights · avg delay 20 min

  • 3 to 6 PM62%

    155 flights · avg delay 21 min

  • 6 to 9 PM54%

    159 flights · avg delay 28 min

  • After 9 PM57%

    72 flights · avg delay 24 min

Best day: Wednesday (82%). Worst: Sunday (67%).

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