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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.

MDW → ATL

Chicago to Atlanta: 3,538 nonstop flights a year

On time (12 months)

80%

Cancelled

2.0%

avg delay 15 min

Best time to leave

9 AM to noon

86% on time vs 70% 6 to 9 PM

Most reliable airline

Delta

83% chance on time

Check MDW to ATL fares

Lowest nonstop fare seen in the next two months: $60 (Frontier 2292 on 2026-11-15). 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 2931

    8:05 AM → 11:00 AM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-27. Same departure also flew as Southwest 979; its record covers all of them.

    87%

    chance on time

    On time (history)
    94%
    Cancelled
    4.1%
    Avg arrival delay
    10 min
    • Arrived on time 94% of the time (47 flights, Jun 2025 to May 2026).
    • Cancelled 4.1% of the time (2 of 49).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (47 flights), so its score leans on the airline's record at this hour.

    Limited track record · 47 flights

    Find Southwest 2931 fares Opens this date on Aviasales

  2. #2 · Delta 1285

    6:00 AM → 9:00 AM2h 00m nonstop

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

    86%

    chance on time

    On time (history)
    90%
    Cancelled
    3.5%
    Avg arrival delay
    18 min
    • Arrived on time 90% of the time (163 flights, Jun 2025 to May 2026).
    • Cancelled 3.5% of the time (6 of 170).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).

    Moderate track record · 163 flights

    Find Delta 1285 fares Opens this date on Aviasales

  3. #3 · Delta 2417

    12:47 PM → 3:42 PM1h 55m nonstop

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

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    3.7%
    Avg arrival delay
    10 min
    • Arrived on time 89% of the time (255 flights, Jun 2025 to May 2026).
    • Cancelled 3.7% of the time (10 of 268).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 255 flights

    Find Delta 2417 fares Opens this date on Aviasales

  4. #4 · Southwest 1397

    7:45 AM → 10:40 AM1h 55m nonstop

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

    85%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 89% of the time (38 flights, Jun 2025 to May 2026).
    • Never cancelled in 38 scheduled flights.
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (38 flights), so its score leans on the airline's record at this hour.

    Limited track record · 38 flights

    Find Southwest 1397 fares Opens this date on Aviasales

  5. #5 · Delta 1063

    10:45 AM → 1:42 PM1h 57m nonstop

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

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    2.5%
    Avg arrival delay
    12 min
    • Arrived on time 87% of the time (356 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (9 AM to noon: 86% on time; 6 to 9 PM: 70%).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 356 flights

    Find Delta 1063 fares Opens this date on Aviasales

  6. #6 · Delta 2060

    6:07 PM → 9:12 PM2h 05m nonstop

    Local times, typical schedule. Last flown 2026-04-12.

    81%

    chance on time

    On time (history)
    84%
    Cancelled
    2.8%
    Avg arrival delay
    14 min
    • Arrived on time 84% of the time (246 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 70% on time; 9 AM to noon: 86%).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).

    Strong track record · 246 flights

    Find Delta 2060 fares Opens this date on Aviasales

  7. #7 · Delta 1728

    5:21 PM → 8:24 PM2h 03m nonstop

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

    79%

    chance on time

    On time (history)
    78%
    Cancelled
    0.0%
    Avg arrival delay
    32 min
    • Arrived on time 78% of the time (49 flights, Jun 2025 to May 2026).
    • Never cancelled in 49 scheduled flights.
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Short track record (49 flights), so its score leans on the airline's record at this hour.

    Limited track record · 49 flights

    Find Delta 1728 fares Opens this date on Aviasales

  8. #8 · Southwest 3453

    2:35 PM → 5:25 PM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-27.

    74%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 75% of the time (16 flights, Jun 2025 to May 2026).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • 59% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 16 flights

    Find Southwest 3453 fares Opens this date on Aviasales

  9. #9 · Southwest 3217

    12:50 PM → 3:45 PM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1440; its record covers all of them.

    73%

    chance on time

    On time (history)
    70%
    Cancelled
    1.1%
    Avg arrival delay
    17 min
    • Arrived on time 70% of the time (86 flights, Jun 2025 to May 2026).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Moderate track record · 86 flights

    Find Southwest 3217 fares Opens this date on Aviasales

  10. #10 · Frontier 2780

    2:15 PM → 5:21 PM2h 06m nonstop

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

    73%

    chance on time

    On time (history)
    76%
    Cancelled
    0.7%
    Avg arrival delay
    16 min
    • Arrived on time 76% of the time (142 flights, Jun 2025 to May 2026).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • 52% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 142 flights

    Find Frontier 2780 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines83%

    1,406 flights · 86% on time as flown · 2.9% cancel

  • Southwest Airlines77%

    1,553 flights · 78% on time as flown · 1.3% cancel

  • Frontier Airlines70%

    579 flights · 70% on time as flown · 1.5% cancel

On time by departure time

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

  • Before 9 AM83%

    1,057 flights · avg delay 12 min

  • 9 AM to noon86%

    690 flights · avg delay 11 min

  • Noon to 3 PM81%

    754 flights · avg delay 12 min

  • 3 to 6 PM74%

    584 flights · avg delay 19 min

  • 6 to 9 PM70%

    443 flights · avg delay 23 min

Best day: Wednesday (83%). Worst: Sunday (76%).

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