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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.

DAL → ORD

Dallas to Chicago: 622 nonstop flights a year

On time (12 months)

71%

Cancelled

0.8%

avg delay 20 min

Best time to leave

Before 9 AM

85% on time vs 56% 6 to 9 PM

Most reliable airline

Southwest

71% chance on time

Check DAL to ORD 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 1728

    8:45 AM → 11:10 AM2h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2264; its record covers all of them.

    78%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 76% of the time (63 flights, Jun 2025 to May 2026).
    • Never cancelled in 65 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 85% on time; 6 to 9 PM: 56%).
    • Departs outside DAL's trouble window (10 AM to 4 PM, when 67% of its 42 ground stops and delay programs started).

    Moderate track record · 63 flights

    Find Southwest 1728 fares Opens this date on Aviasales

  2. #2 · Southwest 3337

    1:05 PM → 3:30 PM2h 25m nonstop

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

    58%

    chance on time

    On time (history)
    41%
    Cancelled
    0.0%
    Avg arrival delay
    33 min
    • Arrived on time 41% of the time (22 flights, Jun 2025 to May 2026).
    • Departs inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (22 flights), so its score leans on the airline's record at this hour.

    Limited track record · 22 flights

    Find Southwest 3337 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines71%

    622 flights · 71% on time as flown · 0.8% cancel

On time by departure time

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

  • Before 9 AM85%

    173 flights · avg delay 10 min

  • 9 AM to noon85%

    154 flights · avg delay 12 min

  • Noon to 3 PM58%

    143 flights · avg delay 23 min

  • 6 to 9 PM56%

    151 flights · avg delay 37 min

Best day: Saturday (83%). 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