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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.

CHS → MDW

Charleston to Chicago: 346 nonstop flights a year

On time (12 months)

85%

Cancelled

0.3%

avg delay 10 min

Best time to leave

Before 9 AM

94% on time vs 63% 3 to 6 PM

Most reliable airline

Southwest

84% chance on time

Check CHS to MDW fares

Lowest nonstop fare seen in the next two months: $195 (Southwest 1063 on 2026-11-04). 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 3165

    7:40 AM → 8:55 AM2h 15m nonstop

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

    91%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 94% of the time (47 flights, Jun 2025 to May 2026).
    • Never cancelled in 47 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 63%).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 47 flights

    Find Southwest 3165 fares Opens this date on Aviasales

  2. #2 · Southwest 2430

    5:15 PM → 8:20 PM2h 25m nonstop

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

    83%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (9 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 63% on time; Before 9 AM: 94%).
    • Short track record (9 flights), so its score leans on the airline's record at this hour.

    Limited track record · 9 flights

    Find Southwest 2430 fares Opens this date on Aviasales

  3. #3 · Southwest 1291

    4:35 PM → 5:55 PM2h 20m nonstop

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

    82%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 71% of the time (7 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 63% on time; Before 9 AM: 94%).
    • 87% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (7 flights), so its score leans on the airline's record at this hour.

    Limited track record · 7 flights

    Find Southwest 1291 fares Opens this date on Aviasales

  4. #4 · Southwest 947

    8:00 AM → 9:15 AM2h 18m nonstop

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

    80%

    chance on time

    On time (history)
    69%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 69% of the time (16 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 63%).
    • 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 (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 947 fares Opens this date on Aviasales

  5. #5 · Southwest 3304

    5:45 PM → 7:05 PM2h 20m nonstop

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

    70%

    chance on time

    On time (history)
    36%
    Cancelled
    0.0%
    Avg arrival delay
    33 min
    • Arrived on time 36% of the time (14 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 63% on time; Before 9 AM: 94%).
    • 86% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (14 flights), so its score leans on the airline's record at this hour.

    Limited track record · 14 flights

    Find Southwest 3304 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines84%

    346 flights · 85% on time as flown · 0.3% cancel

On time by departure time

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

  • Before 9 AM94%

    217 flights · avg delay 4 min

  • 3 to 6 PM63%

    35 flights · avg delay 24 min

  • 6 to 9 PM70%

    93 flights · avg delay 18 min

Best day: Wednesday (91%). Worst: Sunday (83%).

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