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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.

OKC → MDW

Oklahoma City to Chicago: 557 nonstop flights a year

On time (12 months)

84%

Cancelled

1.3%

avg delay 9 min

Best time to leave

Before 9 AM

93% on time vs 76% 3 to 6 PM

Most reliable airline

Southwest

84% chance on time

Check OKC to MDW 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 3622

    5:05 AM → 6:55 AM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2561, 2662; its record covers all of them.

    89%

    chance on time

    On time (history)
    91%
    Cancelled
    1.1%
    Avg arrival delay
    4 min
    • Arrived on time 91% of the time (85 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 76%).

    Moderate track record · 85 flights

    Find Southwest 3622 fares Opens this date on Aviasales

  2. #2 · Southwest 2883

    2:55 PM → 4:45 PM1h 50m nonstop

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

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    7.7%
    Avg arrival delay
    6 min
    • Arrived on time 83% of the time (12 flights, Jun 2025 to May 2026).
    • Short track record (12 flights), so its score leans on the airline's record at this hour.

    Limited track record · 12 flights

    Find Southwest 2883 fares Opens this date on Aviasales

  3. #3 · Southwest 1222

    4:00 PM → 5:50 PM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2015; its record covers all of them.

    73%

    chance on time

    On time (history)
    67%
    Cancelled
    1.4%
    Avg arrival delay
    17 min
    • Arrived on time 67% of the time (69 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; Before 9 AM: 93%).
    • 67% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 69 flights

    Find Southwest 1222 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines84%

    557 flights · 84% on time as flown · 1.3% cancel

On time by departure time

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

  • Before 9 AM93%

    235 flights · avg delay 4 min

  • Noon to 3 PM85%

    35 flights · avg delay 6 min

  • 3 to 6 PM76%

    249 flights · avg delay 14 min

Best day: Monday (90%). Worst: Tuesday (80%).

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