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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 → BWI

Chicago to Baltimore: 1,856 nonstop flights a year

On time (12 months)

79%

Cancelled

2.6%

avg delay 14 min

Best time to leave

Before 9 AM

93% on time vs 60% 6 to 9 PM

Most reliable airline

Southwest

77% chance on time

Check MDW to BWI fares

Lowest nonstop fare seen in the next two months: $210 (Southwest 2848 on 2026-10-24). 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 3203

    6:35 AM → 9:30 AM1h 55m nonstop

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

    91%

    chance on time

    On time (history)
    97%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 97% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 60%).
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).

    Limited track record · 33 flights

    Find Southwest 3203 fares Opens this date on Aviasales

  2. #2 · Southwest 1266

    9:00 AM → 11:50 AM1h 50m nonstop

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

    86%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 91% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 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 (54 flights), so its score leans on the airline's record at this hour.

    Limited track record · 54 flights

    Find Southwest 1266 fares Opens this date on Aviasales

  3. #3 · Southwest 2561

    7:30 AM → 10:20 AM1h 50m nonstop

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

    84%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 87% 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: 93% on time; 6 to 9 PM: 60%).
    • Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 55 flights

    Find Southwest 2561 fares Opens this date on Aviasales

  4. #4 · Southwest 1162

    11:45 AM → 2:35 PM1h 50m nonstop

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

    83%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 87% of the time (23 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 BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 1162 fares Opens this date on Aviasales

  5. #5 · Southwest 857

    12:05 PM → 2:55 PM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2037; its record covers all of them.

    83%

    chance on time

    On time (history)
    94%
    Cancelled
    5.6%
    Avg arrival delay
    4 min
    • Arrived on time 94% of the time (17 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 BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (17 flights), so its score leans on the airline's record at this hour.

    Limited track record · 17 flights

    Find Southwest 857 fares Opens this date on Aviasales

  6. #6 · Southwest 3247

    1:00 PM → 3:50 PM1h 50m nonstop

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

    81%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 83% of the time (47 flights, Jun 2025 to May 2026).
    • Never cancelled in 47 scheduled flights.
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 47 flights

    Find Southwest 3247 fares Opens this date on Aviasales

  7. #7 · Southwest 2713

    10:35 AM → 1:20 PM1h 45m nonstop

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

    79%

    chance on time

    On time (history)
    83%
    Cancelled
    13.3%
    Avg arrival delay
    9 min
    • Arrived on time 83% of the time (12 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.
    • Short track record (12 flights), so its score leans on the airline's record at this hour.

    Limited track record · 12 flights

    Find Southwest 2713 fares Opens this date on Aviasales

  8. #8 · Southwest 1473

    5:40 PM → 8:25 PM1h 50m nonstop

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

    69%

    chance on time

    On time (history)
    76%
    Cancelled
    5.6%
    Avg arrival delay
    20 min
    • Arrived on time 76% of the time (17 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).
    • Short track record (17 flights), so its score leans on the airline's record at this hour.

    Limited track record · 17 flights

    Find Southwest 1473 fares Opens this date on Aviasales

  9. #9 · Southwest 1766

    5:00 PM → 7:45 PM1h 45m nonstop

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

    63%

    chance on time

    On time (history)
    60%
    Cancelled
    8.7%
    Avg arrival delay
    42 min
    • Arrived on time 60% of the time (20 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 BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (20 flights), so its score leans on the airline's record at this hour.

    Limited track record · 20 flights

    Find Southwest 1766 fares Opens this date on Aviasales

  10. #10 · Southwest 2170

    5:50 PM → 8:40 PM1h 50m nonstop

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

    63%

    chance on time

    On time (history)
    61%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 61% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 54 flights

    Find Southwest 2170 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines77%

    1,759 flights · 79% on time as flown · 2.7% cancel

  • Frontier Airlines75%

    97 flights · 76% on time as flown · 2.0% cancel

On time by departure time

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

  • Before 9 AM93%

    512 flights · avg delay 3 min

  • 9 AM to noon86%

    361 flights · avg delay 8 min

  • Noon to 3 PM78%

    334 flights · avg delay 16 min

  • 3 to 6 PM65%

    267 flights · avg delay 23 min

  • 6 to 9 PM60%

    249 flights · avg delay 25 min

  • After 9 PM61%

    133 flights · avg delay 30 min

Best day: Tuesday (81%). Worst: Monday (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