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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.

CLT → MDW

Charlotte to Chicago: 718 nonstop flights a year

On time (12 months)

76%

Cancelled

1.8%

avg delay 15 min

Best time to leave

Before 9 AM

89% on time vs 61% 6 to 9 PM

Most reliable airline

Southwest

74% chance on time

Check CLT to MDW fares

Lowest nonstop fare seen in the next two months: $284 (Southwest 1226 on 2026-10-22). 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 2667

    7:30 AM → 8:45 AM2h 10m nonstop

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

    85%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    6 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: 89% on time; 6 to 9 PM: 61%).
    • Departs outside CLT's trouble window (2 PM to 8 PM, when 63% of its 48 ground stops and delay programs started).

    Limited track record · 55 flights

    Find Southwest 2667 fares Opens this date on Aviasales

  2. #2 · Southwest 1901

    8:00 AM → 9:05 AM2h 05m nonstop

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

    79%

    chance on time

    On time (history)
    84%
    Cancelled
    3.0%
    Avg arrival delay
    11 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 most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 61%).
    • Departs outside CLT's trouble window (2 PM to 8 PM, when 63% of its 48 ground stops and delay programs started).

    Limited track record · 32 flights

    Find Southwest 1901 fares Opens this date on Aviasales

  3. #3 · Southwest 3591

    7:00 PM → 8:05 PM2h 05m nonstop

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

    68%

    chance on time

    On time (history)
    72%
    Cancelled
    0.0%
    Avg arrival delay
    22 min
    • Arrived on time 72% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 61% on time; Before 9 AM: 89%).
    • Departs inside CLT's trouble window: 63% of its 48 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 54 flights

    Find Southwest 3591 fares Opens this date on Aviasales

  4. #4 · Southwest 2382

    7:20 PM → 8:30 PM2h 10m nonstop

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

    61%

    chance on time

    On time (history)
    52%
    Cancelled
    3.6%
    Avg arrival delay
    26 min
    • Arrived on time 52% of the time (25 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 61% on time; Before 9 AM: 89%).
    • Departs inside CLT's trouble window: 63% of its 48 ground stops and delay programs started between 2 PM and 8 PM.
    • 61% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 25 flights

    Find Southwest 2382 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines74%

    718 flights · 76% on time as flown · 1.8% cancel

On time by departure time

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

  • Before 9 AM89%

    314 flights · avg delay 7 min

  • Noon to 3 PM62%

    52 flights · avg delay 24 min

  • 3 to 6 PM78%

    97 flights · avg delay 10 min

  • 6 to 9 PM61%

    252 flights · avg delay 27 min

Best day: Tuesday (80%). 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