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1,332 km · Domestic

Boston Logan (BOS) – Louisville Muhammad Ali (SDF)

In July 2026, 120 flights operated between Boston Logan and Louisville Muhammad Ali (both directions), and 75.0% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January9992▼ 7.1%
February8491▲ 8.3%
March104122▲ 17.3%
April116124▲ 6.9%
May132128▼ 3.0%
June1201200.0%
July1201200.0%
August122––
September118––
October121–in progress
November118––
December114––
Year to date (Jan–Jul)775797▲ 2.8%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January86.9%81.5%▼ 6.2%
February77.4%90.1%▲ 16.4%
March89.4%89.3%▼ 0.1%
April87.9%83.1%▼ 5.5%
May75.8%86.7%▲ 14.4%
June72.5%80.0%▲ 10.3%
July75.8%75.0%▼ 1.1%
August82.0%––
September69.5%––
October71.9%–in progress
November87.3%––
December80.7%––
Year-to-date average (Jan–Jul)80.8%83.7%▲ 3.5%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January410▲ 150.0%
February07–
March00–
April00–
May00–
June00–
July24▲ 100.0%
August0––
September2––
October1–in progress
November0––
December2––
Year to date (Jan–Jul)621▲ 250.0%

Airlines on this route

  1. Republic Airways 81.5%
  2. Envoy Air 18.2%
  3. Delta Air Lines 0.3%

Oct 1, 2024 – Jul 31, 2026

By direction

BOS → SDF

Scheduled flights
1,250
Flights operated
1,236
Cancelled
14 · 1.1%
On-time departures
87.7%

SDF → BOS

Scheduled flights
1,250
Flights operated
1,230
Cancelled
20 · 1.6%
On-time departures
76.3%

BOS → SDF and SDF → BOS counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Republic Airways YX 2,038 81.5% 82.8% 30
Envoy Air MQ 454 18.2% 78.7% 4
Delta Air Lines DL 8 0.3% 62.5% 0

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay10:00–11:00-0.4min · 364 recorded · 358 measured
Gap to highest-delay hour18.5min10:00 ↔ 16:00
Recorded flights2,500BOS–SDF

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 2 recorded · 2 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 80 recorded · 76 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 34 recorded · 34 measured · Source: the US BTS 09:00 · 88.5% · 259 recorded · 253 measured · Source: the US BTS 10:00 · 90.5% · 364 recorded · 358 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 63 recorded · 63 measured · Source: the US BTS 12:00 · 83.5% · 353 recorded · 346 measured · Source: the US BTS 13:00 · 80.8% · 518 recorded · 516 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 191 recorded · 191 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 81 recorded · 80 measured · Source: the US BTS 16:00 · 70.9% · 436 recorded · 430 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 108 recorded · 106 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 8 recorded · 8 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 2 recorded · 2 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 80 recorded · 76 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 34 recorded · 34 measured · Source: the US BTS 09:00 · 1.7 min · 259 recorded · 253 measured · Source: the US BTS 10:00 · -0.4 min · 364 recorded · 358 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 63 recorded · 63 measured · Source: the US BTS 12:00 · 6.0 min · 353 recorded · 346 measured · Source: the US BTS 13:00 · 9.2 min · 518 recorded · 516 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 191 recorded · 191 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 81 recorded · 80 measured · Source: the US BTS 16:00 · 18.2 min · 436 recorded · 430 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 108 recorded · 106 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 8 recorded · 8 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · 2 · 2 recorded · 2 measured · Source: the US BTS 07:00 · 80 · 80 recorded · 76 measured · Source: the US BTS 08:00 · 34 · 34 recorded · 34 measured · Source: the US BTS 09:00 · 259 · 259 recorded · 253 measured · Source: the US BTS 10:00 · 364 · 364 recorded · 358 measured · Source: the US BTS 11:00 · 63 · 63 recorded · 63 measured · Source: the US BTS 12:00 · 353 · 353 recorded · 346 measured · Source: the US BTS 13:00 · 518 · 518 recorded · 516 measured · Source: the US BTS 14:00 · 191 · 191 recorded · 191 measured · Source: the US BTS 15:00 · 81 · 81 recorded · 80 measured · Source: the US BTS 16:00 · 436 · 436 recorded · 430 measured · Source: the US BTS 17:00 · 108 · 108 recorded · 106 measured · Source: the US BTS 18:00 · 8 · 8 recorded · 8 measured · Source: the US BTS 19:00 · 3 · 3 recorded · 3 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00No observations———
06:00Fewer than 200 measured departures—22
07:00Fewer than 200 measured departures—7680
08:00Fewer than 200 measured departures—3434
09:0088.5%1.7 min253259
10:0090.5%-0.4 min358364
11:00Fewer than 200 measured departures—6363
12:0083.5%6.0 min346353
13:0080.8%9.2 min516518
14:00Fewer than 200 measured departures—191191
15:00Fewer than 200 measured departures—8081
16:0070.9%18.2 min430436
17:00Fewer than 200 measured departures—106108
18:00Fewer than 200 measured departures—88
19:00Fewer than 200 measured departures—33
20:00No observations———
21:00No observations———
22:00No observations———
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 82.7% · 376 recorded · 364 measured · Source: the US BTS Tuesday · 81.0% · 366 recorded · 357 measured · Source: the US BTS Wednesday · 84.3% · 364 recorded · 362 measured · Source: the US BTS Thursday · 80.9% · 367 recorded · 366 measured · Source: the US BTS Friday · 81.9% · 366 recorded · 365 measured · Source: the US BTS Saturday · 85.0% · 296 recorded · 294 measured · Source: the US BTS Sunday · 78.8% · 365 recorded · 358 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 7.4 min · 376 recorded · 364 measured · Source: the US BTS Tuesday · 9.7 min · 366 recorded · 357 measured · Source: the US BTS Wednesday · 5.6 min · 364 recorded · 362 measured · Source: the US BTS Thursday · 8.7 min · 367 recorded · 366 measured · Source: the US BTS Friday · 6.3 min · 366 recorded · 365 measured · Source: the US BTS Saturday · 5.4 min · 296 recorded · 294 measured · Source: the US BTS Sunday · 10.3 min · 365 recorded · 358 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 376 · 376 recorded · 364 measured · Source: the US BTS Tuesday · 366 · 366 recorded · 357 measured · Source: the US BTS Wednesday · 364 · 364 recorded · 362 measured · Source: the US BTS Thursday · 367 · 367 recorded · 366 measured · Source: the US BTS Friday · 366 · 366 recorded · 365 measured · Source: the US BTS Saturday · 296 · 296 recorded · 294 measured · Source: the US BTS Sunday · 365 · 365 recorded · 358 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday82.7%7.4 min364376
Tuesday81.0%9.7 min357366
Wednesday84.3%5.6 min362364
Thursday80.9%8.7 min366367
Friday81.9%6.3 min365366
Saturday85.0%5.4 min294296
Sunday78.8%10.3 min358365

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · Fewer than 200 measured departures · 205 recorded · 191 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 182 recorded · 175 measured · Source: the US BTS Mar · 89.4% · 226 recorded · 226 measured · Source: the US BTS Apr · 85.4% · 240 recorded · 240 measured · Source: the US BTS May · 81.2% · 260 recorded · 260 measured · Source: the US BTS Jun · 76.3% · 240 recorded · 240 measured · Source: the US BTS Jul · 75.4% · 246 recorded · 240 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 122 recorded · 122 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 120 recorded · 118 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 200 recorded · 199 measured · Source: the US BTS Nov · 89.2% · 232 recorded · 232 measured · Source: the US BTS Dec · 81.6% · 227 recorded · 223 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · Fewer than 200 measured departures · 205 recorded · 191 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 182 recorded · 175 measured · Source: the US BTS Mar · 1.0 min · 226 recorded · 226 measured · Source: the US BTS Apr · 3.9 min · 240 recorded · 240 measured · Source: the US BTS May · 7.4 min · 260 recorded · 260 measured · Source: the US BTS Jun · 11.7 min · 240 recorded · 240 measured · Source: the US BTS Jul · 17.3 min · 246 recorded · 240 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 122 recorded · 122 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 120 recorded · 118 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 200 recorded · 199 measured · Source: the US BTS Nov · 4.5 min · 232 recorded · 232 measured · Source: the US BTS Dec · 7.5 min · 227 recorded · 223 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 205 · 205 recorded · 191 measured · Source: the US BTS Feb · 182 · 182 recorded · 175 measured · Source: the US BTS Mar · 226 · 226 recorded · 226 measured · Source: the US BTS Apr · 240 · 240 recorded · 240 measured · Source: the US BTS May · 260 · 260 recorded · 260 measured · Source: the US BTS Jun · 240 · 240 recorded · 240 measured · Source: the US BTS Jul · 246 · 246 recorded · 240 measured · Source: the US BTS Aug · 122 · 122 recorded · 122 measured · Source: the US BTS Sep · 120 · 120 recorded · 118 measured · Source: the US BTS Oct · 200 · 200 recorded · 199 measured · Source: the US BTS Nov · 232 · 232 recorded · 232 measured · Source: the US BTS Dec · 227 · 227 recorded · 223 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—191205
FebFewer than 200 measured departures—175182
Mar89.4%1.0 min226226
Apr85.4%3.9 min240240
May81.2%7.4 min260260
Jun76.3%11.7 min240240
Jul75.4%17.3 min240246
AugFewer than 200 measured departures—122122
SepFewer than 200 measured departures—118120
OctFewer than 200 measured departures—199200
Nov89.2%4.5 min232232
Dec81.6%7.5 min223227

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 80.9% 2,022
  • Delayed >15 min 17.8% 444
  • Cancelled 1.4% 34
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

12
12 of 12
Flight numbersBy direction DeparturesOn time
YX5615 BOS → SDF 412 89.7%
YX4786 BOS → SDF 372 85.3%
YX4786 SDF → BOS 372 76.8%
YX5615 SDF → BOS 297 82.8%
YX5596 BOS → SDF 187 88.2%
YX5596 SDF → BOS 184 66.7%
YX5823 SDF → BOS 92 82.4%
MQ4170 SDF → BOS 65 63.1%
MQ3438 SDF → BOS 51 66.0%
MQ3438 BOS → SDF 51 82.4%
MQ4163 BOS → SDF 38 89.5%
MQ4170 BOS → SDF 33 93.9%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 120 +0.0% 4 75.0%
June 2026 120 +0.0% 0 80.0%
May 2026 128 −3.0% 0 86.7%
April 2026 124 +6.9% 0 83.1%
March 2026 122 +17.3% 0 89.3%
February 2026 91 +8.3% 7 90.1%
January 2026 92 −7.1% 10 81.5%
December 2025 114 +4.6% 2 80.7%
November 2025 118 +3.5% 0 87.3%
October 2025 121 +55.1% 1 71.9%
September 2025 118 2 69.5%
August 2025 122 0 82.0%
July 2025 120 2 75.8%
June 2025 120 0 72.5%
May 2025 132 0 75.8%
April 2025 116 0 87.9%
March 2025 104 0 89.4%
February 2025 84 0 77.4%
January 2025 99 4 86.9%
December 2024 109 2 82.6%
November 2024 114 0 91.2%
October 2024 78 0 94.9%

How to read this chart

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