Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

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.

BWI → MDW

Baltimore to Chicago: 1,852 nonstop flights a year

On time (12 months)

76%

Cancelled

2.0%

avg delay 17 min

Best time to leave

Before 9 AM

91% on time vs 55% after 9 PM

Most reliable airline

Southwest

75% chance on time

Check BWI to MDW fares

Lowest nonstop fare seen in the next two months: $138 (Southwest 323 on 2026-11-02). 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 3482

    6:30 AM → 7:35 AM2h 05m nonstop

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

    91%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 55%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • 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 · 23 flights

    Find Southwest 3482 fares Opens this date on Aviasales

  2. #2 · Southwest 2015

    6:05 AM → 7:10 AM2h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    88%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 94% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 55%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 31 flights

    Find Southwest 2015 fares Opens this date on Aviasales

  3. #3 · Southwest 4014

    8:35 AM → 9:50 AM2h 15m nonstop

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

    83%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 92% of the time (13 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 55%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • 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 · 13 flights

    Find Southwest 4014 fares Opens this date on Aviasales

  4. #4 · Southwest 1583

    6:40 AM → 7:50 AM2h 10m nonstop

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

    83%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 79% 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: 91% on time; After 9 PM: 55%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 33 flights

    Find Southwest 1583 fares Opens this date on Aviasales

  5. #5 · Southwest 2455

    2:00 PM → 3:05 PM2h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    81%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 94% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (31 flights), so its score leans on the airline's record at this hour.

    Limited track record · 31 flights

    Find Southwest 2455 fares Opens this date on Aviasales

  6. #6 · Southwest 1717

    3:00 PM → 4:05 PM2h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2786; its record covers all of them.

    81%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 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 1717 fares Opens this date on Aviasales

  7. #7 · Southwest 2646

    11:05 AM → 12:05 PM2h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 3108; its record covers all of them.

    80%

    chance on time

    On time (history)
    83%
    Cancelled
    2.1%
    Avg arrival delay
    15 min
    • Arrived on time 83% of the time (47 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • 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 (47 flights), so its score leans on the airline's record at this hour.

    Limited track record · 47 flights

    Find Southwest 2646 fares Opens this date on Aviasales

  8. #8 · Southwest 3522

    9:35 AM → 10:40 AM2h 05m nonstop

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

    80%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • 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 3522 fares Opens this date on Aviasales

  9. #9 · Southwest 3413

    3:10 PM → 4:15 PM2h 05m nonstop

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

    78%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 81% of the time (16 flights, Jun 2025 to May 2026).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 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 3413 fares Opens this date on Aviasales

  10. #10 · Southwest 4543

    5:10 PM → 6:15 PM2h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    73%

    chance on time

    On time (history)
    63%
    Cancelled
    0.0%
    Avg arrival delay
    37 min
    • Arrived on time 63% of the time (8 flights, Jun 2025 to May 2026).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • 93% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 4543 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines75%

    1,755 flights · 76% on time as flown · 2.0% cancel

  • Frontier Airlines68%

    97 flights · 66% on time as flown · 2.0% cancel

On time by departure time

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

  • Before 9 AM91%

    440 flights · avg delay 5 min

  • 9 AM to noon85%

    221 flights · avg delay 10 min

  • Noon to 3 PM79%

    312 flights · avg delay 14 min

  • 3 to 6 PM75%

    315 flights · avg delay 19 min

  • 6 to 9 PM60%

    407 flights · avg delay 30 min

  • After 9 PM55%

    157 flights · avg delay 28 min

Best day: Tuesday (79%). Worst: Sunday (72%).

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