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Route on-time record

BWI to SDF: most on-time flights and the best time to fly

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Louisville (Louisville Muhammad Ali International Airport). 890 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 2.6% were cancelled. The most reliable flight number was Southwest 2137 at 10:45 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

BWI → SDF

Baltimore to Louisville: 890 nonstop flights a year

On time (12 months)

79%

Cancelled

2.6%

avg delay 12 min

Best time to leave

9 AM to noon

87% on time vs 70% after 9 PM

Most reliable airline

Southwest

77% chance on time

Check BWI to SDF 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 2137

    10:45 AM → 12:35 PM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2032; its record covers all of them.

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 89% 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 (9 AM to noon: 87% on time; After 9 PM: 70%).
    • 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 · 55 flights

    Find Southwest 2137 fares Opens this date on Aviasales

  2. #2 · Southwest 1536

    10:35 AM → 12:25 PM1h 50m nonstop

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

    85%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 93% of the time (28 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (9 AM to noon: 87% on time; After 9 PM: 70%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find Southwest 1536 fares Opens this date on Aviasales

  3. #3 · Southwest 1319

    9:55 PM → 11:45 PM1h 50m nonstop

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

    70%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 64% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's least on-time window (After 9 PM: 70% on time; 9 AM to noon: 87%).
    • 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 · 55 flights

    Find Southwest 1319 fares Opens this date on Aviasales

  4. #4 · Southwest 1317

    3:05 PM → 4:50 PM1h 45m nonstop

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

    68%

    chance on time

    On time (history)
    57%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 57% of the time (23 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 (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 1317 fares Opens this date on Aviasales

  5. #5 · Southwest 3211

    10:45 PM → 12:40 AM1h 55m nonstop

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

    67%

    chance on time

    On time (history)
    69%
    Cancelled
    3.0%
    Avg arrival delay
    20 min
    • Arrived on time 69% of the time (32 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (1 of 33).
    • Leaves in this route's least on-time window (After 9 PM: 70% on time; 9 AM to noon: 87%).
    • 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 · 32 flights

    Find Southwest 3211 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines77%

    890 flights · 79% on time as flown · 2.6% cancel

On time by departure time

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

  • 9 AM to noon87%

    364 flights · avg delay 7 min

  • 3 to 6 PM73%

    156 flights · avg delay 15 min

  • 6 to 9 PM82%

    96 flights · avg delay 11 min

  • After 9 PM70%

    272 flights · avg delay 19 min

Best day: Tuesday (86%). Worst: Sunday (70%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
81
F
88
M
83
A
76
M
73
J
73
J
57
A
74
S
85
O
79
N
83
D
78

What delays this route

  • Late-arriving aircraft46%
  • Airline (crew, maintenance, boarding)39%
  • Air traffic control and airport volume10%
  • Severe weather5%

Share of delay minutes by the cause airlines report to the US DOT.

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

BWI to SDF questions

What time of day is best to fly BWI to SDF?
9 AM to noon: 87% of flights arrived on time, against 70% for departures after 9 PM.
Which airline is most on time from BWI to SDF?
Southwest, with a season-adjusted 77% chance of operating and arriving on time over 890 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on BWI to SDF?
July (57% on time); the best was February (88%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from BWI

Live status: FAA delays and ground stops