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Route on-time record

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

Boston (Boston Logan International Airport) to Louisville (Louisville Muhammad Ali International Airport). 707 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 1.6% were cancelled. The most reliable flight number was Envoy 3767 at 10:05 AM.

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

BOS → SDF

Boston to Louisville: 707 nonstop flights a year

On time (12 months)

85%

Cancelled

1.6%

avg delay 8 min

Best time to leave

Before 9 AM

89% on time vs 69% 3 to 6 PM

Most reliable airline

Envoy

86% chance on time

Check BOS 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 · Envoy 3767 · sold as American Eagle

    10:05 AM → 12:49 PM2h 44m nonstop

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

    89%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 92% of the time (26 flights, Jun 2025 to May 2026).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • Short track record (26 flights), so its score leans on the airline's record at this hour.

    Limited track record · 26 flights

    Find 10:05 AM flight fares Opens this date on Aviasales

  2. #2 · Envoy 4163 · sold as American Eagle

    9:00 AM → 11:41 AM2h 41m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 87% of the time (38 flights, Jun 2025 to May 2026).
    • Never cancelled in 38 scheduled flights.
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • Short track record (38 flights), so its score leans on the airline's record at this hour.

    Limited track record · 38 flights

    Find 9:00 AM flight fares Opens this date on Aviasales

  3. #3 · Republic 5615 · sold as American Eagle, Delta Connection or United Express

    10:37 AM → 1:16 PM2h 40m nonstop

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

    83%

    chance on time

    On time (history)
    84%
    Cancelled
    2.7%
    Avg arrival delay
    10 min
    • Arrived on time 84% of the time (145 flights, Jun 2025 to May 2026).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Moderate track record · 145 flights

    Find 10:37 AM flight fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Envoy Air (sold as American Eagle)86%

    178 flights · 89% on time as flown · 1.3% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)83%

    527 flights · 84% on time as flown · 1.7% cancel

On time by departure time

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

  • Before 9 AM89%

    92 flights · avg delay 4 min

  • 9 AM to noon88%

    333 flights · avg delay 8 min

  • Noon to 3 PM83%

    246 flights · avg delay 8 min

  • 3 to 6 PM69%

    36 flights · avg delay 23 min

Best day: Tuesday (91%). Worst: Sunday (86%).

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
84
M
94
A
92
M
86
J
88
J
81
A
87
S
90
O
93
N
95
D
84

What delays this route

  • Late-arriving aircraft39%
  • Airline (crew, maintenance, boarding)37%
  • Air traffic control and airport volume23%
  • Severe weather2%

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

BOS to SDF questions

What time of day is best to fly BOS to SDF?
Before 9 AM: 89% of flights arrived on time, against 69% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from BOS to SDF?
Envoy, with a season-adjusted 86% chance of operating and arriving on time over 178 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 BOS to SDF?
January (81% on time); the best was November (95%), 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 BOS

Live status: FAA delays and ground stops