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795 km · Domestic

Baltimore/Washington International Thurgood Marshall (BWI) – Louisville Muhammad Ali (SDF)

In July 2026, 159 flights operated between Baltimore/Washington International Thurgood Marshall and Louisville Muhammad Ali (both directions), and 73.0% 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
January1181180.0%
February112109▼ 2.7%
March1221220.0%
April144148▲ 2.8%
May159160▲ 0.6%
June160159▼ 0.6%
July149159▲ 6.7%
August158––
September154––
October190–in progress
November138––
December130––
Year to date (Jan–Jul)964975▲ 1.1%

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
January89.8%88.1%▼ 1.9%
February83.0%90.8%▲ 9.4%
March84.4%76.2%▼ 9.7%
April77.8%77.7%▼ 0.1%
May79.9%74.4%▼ 6.9%
June73.8%74.2%▲ 0.5%
July63.1%73.0%▲ 15.7%
August81.0%––
September86.4%––
October76.8%–in progress
November84.8%––
December76.9%––
Year-to-date average (Jan–Jul)78.8%79.2%▲ 0.5%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January880.0%
February03–
March220.0%
April00–
May10▼ 100.0%
June53▼ 40.0%
July137▼ 46.2%
August2––
September0––
October0–in progress
November9––
December2––
Year to date (Jan–Jul)2923▼ 20.7%

By direction

BWI → SDF

Scheduled flights
1,583
Flights operated
1,550
Cancelled
33 · 2.1%
On-time departures
75.9%

SDF → BWI

Scheduled flights
1,584
Flights operated
1,552
Cancelled
32 · 2.0%
On-time departures
84.1%

BWI → SDF and SDF → BWI counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 3,167 100.0% 80.0% 65

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 delay06:00–07:00-1.6min · 202 recorded · 200 measured
Gap to highest-delay hour21.9min06:00 ↔ 17:00
Recorded flights3,167BWI–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 · 95.8% · 418 recorded · 409 measured · Source: the US BTS 06:00 · 98.0% · 202 recorded · 200 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 10 recorded · 10 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 43 recorded · 43 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 61 recorded · 61 measured · Source: the US BTS 10:00 · 84.0% · 465 recorded · 461 measured · Source: the US BTS 11:00 · 88.0% · 311 recorded · 309 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 68 recorded · 67 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 27 recorded · 26 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 56 recorded · 56 measured · Source: the US BTS 15:00 · 71.6% · 221 recorded · 218 measured · Source: the US BTS 16:00 · 74.6% · 276 recorded · 268 measured · Source: the US BTS 17:00 · 64.7% · 261 recorded · 252 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 80 recorded · 79 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 56 recorded · 55 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 168 recorded · 162 measured · Source: the US BTS 21:00 · 62.6% · 265 recorded · 259 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 179 recorded · 167 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 · 3.7 min · 418 recorded · 409 measured · Source: the US BTS 06:00 · -1.6 min · 202 recorded · 200 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 10 recorded · 10 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 43 recorded · 43 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 61 recorded · 61 measured · Source: the US BTS 10:00 · 7.3 min · 465 recorded · 461 measured · Source: the US BTS 11:00 · 4.1 min · 311 recorded · 309 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 68 recorded · 67 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 27 recorded · 26 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 56 recorded · 56 measured · Source: the US BTS 15:00 · 14.2 min · 221 recorded · 218 measured · Source: the US BTS 16:00 · 14.1 min · 276 recorded · 268 measured · Source: the US BTS 17:00 · 20.3 min · 261 recorded · 252 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 80 recorded · 79 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 56 recorded · 55 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 168 recorded · 162 measured · Source: the US BTS 21:00 · 18.7 min · 265 recorded · 259 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 179 recorded · 167 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 · 418 · 418 recorded · 409 measured · Source: the US BTS 06:00 · 202 · 202 recorded · 200 measured · Source: the US BTS 07:00 · 10 · 10 recorded · 10 measured · Source: the US BTS 08:00 · 43 · 43 recorded · 43 measured · Source: the US BTS 09:00 · 61 · 61 recorded · 61 measured · Source: the US BTS 10:00 · 465 · 465 recorded · 461 measured · Source: the US BTS 11:00 · 311 · 311 recorded · 309 measured · Source: the US BTS 12:00 · 68 · 68 recorded · 67 measured · Source: the US BTS 13:00 · 27 · 27 recorded · 26 measured · Source: the US BTS 14:00 · 56 · 56 recorded · 56 measured · Source: the US BTS 15:00 · 221 · 221 recorded · 218 measured · Source: the US BTS 16:00 · 276 · 276 recorded · 268 measured · Source: the US BTS 17:00 · 261 · 261 recorded · 252 measured · Source: the US BTS 18:00 · 80 · 80 recorded · 79 measured · Source: the US BTS 19:00 · 56 · 56 recorded · 55 measured · Source: the US BTS 20:00 · 168 · 168 recorded · 162 measured · Source: the US BTS 21:00 · 265 · 265 recorded · 259 measured · Source: the US BTS 22:00 · 179 · 179 recorded · 167 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———
05:0095.8%3.7 min409418
06:0098.0%-1.6 min200202
07:00Fewer than 200 measured departures—1010
08:00Fewer than 200 measured departures—4343
09:00Fewer than 200 measured departures—6161
10:0084.0%7.3 min461465
11:0088.0%4.1 min309311
12:00Fewer than 200 measured departures—6768
13:00Fewer than 200 measured departures—2627
14:00Fewer than 200 measured departures—5656
15:0071.6%14.2 min218221
16:0074.6%14.1 min268276
17:0064.7%20.3 min252261
18:00Fewer than 200 measured departures—7980
19:00Fewer than 200 measured departures—5556
20:00Fewer than 200 measured departures—162168
21:0062.6%18.7 min259265
22:00Fewer than 200 measured departures—167179
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 80.9% · 484 recorded · 471 measured · Source: the US BTS Tuesday · 85.1% · 384 recorded · 376 measured · Source: the US BTS Wednesday · 85.0% · 385 recorded · 381 measured · Source: the US BTS Thursday · 79.5% · 487 recorded · 479 measured · Source: the US BTS Friday · 76.5% · 491 recorded · 485 measured · Source: the US BTS Saturday · 80.0% · 425 recorded · 419 measured · Source: the US BTS Sunday · 75.2% · 511 recorded · 491 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 · 10.1 min · 484 recorded · 471 measured · Source: the US BTS Tuesday · 6.5 min · 384 recorded · 376 measured · Source: the US BTS Wednesday · 6.6 min · 385 recorded · 381 measured · Source: the US BTS Thursday · 12.9 min · 487 recorded · 479 measured · Source: the US BTS Friday · 11.8 min · 491 recorded · 485 measured · Source: the US BTS Saturday · 11.3 min · 425 recorded · 419 measured · Source: the US BTS Sunday · 12.3 min · 511 recorded · 491 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 · 484 · 484 recorded · 471 measured · Source: the US BTS Tuesday · 384 · 384 recorded · 376 measured · Source: the US BTS Wednesday · 385 · 385 recorded · 381 measured · Source: the US BTS Thursday · 487 · 487 recorded · 479 measured · Source: the US BTS Friday · 491 · 491 recorded · 485 measured · Source: the US BTS Saturday · 425 · 425 recorded · 419 measured · Source: the US BTS Sunday · 511 · 511 recorded · 491 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday80.9%10.1 min471484
Tuesday85.1%6.5 min376384
Wednesday85.0%6.6 min381385
Thursday79.5%12.9 min479487
Friday76.5%11.8 min485491
Saturday80.0%11.3 min419425
Sunday75.2%12.3 min491511

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 · 89.0% · 252 recorded · 236 measured · Source: the US BTS Feb · 86.9% · 224 recorded · 221 measured · Source: the US BTS Mar · 80.3% · 248 recorded · 244 measured · Source: the US BTS Apr · 77.7% · 292 recorded · 292 measured · Source: the US BTS May · 77.1% · 320 recorded · 319 measured · Source: the US BTS Jun · 74.0% · 327 recorded · 319 measured · Source: the US BTS Jul · 68.2% · 328 recorded · 308 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 160 recorded · 158 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 154 recorded · 154 measured · Source: the US BTS Oct · 80.1% · 302 recorded · 302 measured · Source: the US BTS Nov · 87.7% · 294 recorded · 285 measured · Source: the US BTS Dec · 79.9% · 266 recorded · 264 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 · 7.7 min · 252 recorded · 236 measured · Source: the US BTS Feb · 4.7 min · 224 recorded · 221 measured · Source: the US BTS Mar · 10.3 min · 248 recorded · 244 measured · Source: the US BTS Apr · 8.5 min · 292 recorded · 292 measured · Source: the US BTS May · 10.8 min · 320 recorded · 319 measured · Source: the US BTS Jun · 17.1 min · 327 recorded · 319 measured · Source: the US BTS Jul · 24.4 min · 328 recorded · 308 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 160 recorded · 158 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 154 recorded · 154 measured · Source: the US BTS Oct · 7.8 min · 302 recorded · 302 measured · Source: the US BTS Nov · 3.1 min · 294 recorded · 285 measured · Source: the US BTS Dec · 8.5 min · 266 recorded · 264 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 · 252 · 252 recorded · 236 measured · Source: the US BTS Feb · 224 · 224 recorded · 221 measured · Source: the US BTS Mar · 248 · 248 recorded · 244 measured · Source: the US BTS Apr · 292 · 292 recorded · 292 measured · Source: the US BTS May · 320 · 320 recorded · 319 measured · Source: the US BTS Jun · 327 · 327 recorded · 319 measured · Source: the US BTS Jul · 328 · 328 recorded · 308 measured · Source: the US BTS Aug · 160 · 160 recorded · 158 measured · Source: the US BTS Sep · 154 · 154 recorded · 154 measured · Source: the US BTS Oct · 302 · 302 recorded · 302 measured · Source: the US BTS Nov · 294 · 294 recorded · 285 measured · Source: the US BTS Dec · 266 · 266 recorded · 264 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan89.0%7.7 min236252
Feb86.9%4.7 min221224
Mar80.3%10.3 min244248
Apr77.7%8.5 min292292
May77.1%10.8 min319320
Jun74.0%17.1 min319327
Jul68.2%24.4 min308328
AugFewer than 200 measured departures—158160
SepFewer than 200 measured departures—154154
Oct80.1%7.8 min302302
Nov87.7%3.1 min285294
Dec79.9%8.5 min264266

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 78.3% 2,481
  • Delayed >15 min 19.6% 621
  • Cancelled 2.1% 65
  • 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

36
36 of 36
Flight numbersBy direction DeparturesOn time
WN548 SDF → BWI 123 97.5%
WN4535 BWI → SDF 86 77.7%
WN1003 SDF → BWI 74 83.3%
WN4285 SDF → BWI 64 98.4%
WN1936 BWI → SDF 61 54.2%
WN3372 SDF → BWI 61 81.4%
WN1941 BWI → SDF 60 66.7%
WN1036 BWI → SDF 58 89.1%
WN1319 BWI → SDF 58 51.7%
WN2189 BWI → SDF 58 79.3%
WN3478 SDF → BWI 58 94.6%
WN3479 SDF → BWI 58 92.6%
WN4186 SDF → BWI 58 100.0%
WN4612 SDF → BWI 58 91.1%
WN479 SDF → BWI 58 94.8%
WN538 BWI → SDF 58 67.2%
WN984 SDF → BWI 58 96.6%
WN156 BWI → SDF 57 52.9%
WN1935 BWI → SDF 55 70.9%
WN2275 SDF → BWI 51 70.8%
WN1388 BWI → SDF 47 88.9%
WN3145 BWI → SDF 46 73.3%
WN1908 BWI → SDF 45 86.1%
WN2137 BWI → SDF 44 93.2%
WN1297 BWI → SDF 42 83.3%
WN2517 BWI → SDF 42 78.6%
WN1539 SDF → BWI 40 72.5%
WN4209 SDF → BWI 34 69.7%
WN1201 BWI → SDF 33 69.7%
WN3211 BWI → SDF 33 56.3%
WN4416 SDF → BWI 33 90.6%
WN2507 BWI → SDF 32 100.0%
WN2573 BWI → SDF 32 87.5%
WN1938 BWI → SDF 31 67.7%
WN2668 SDF → BWI 31 90.3%
WN1105 BWI → SDF 30 93.3%

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 159 +6.7% 7 73.0%
June 2026 159 −0.6% 3 74.2%
May 2026 160 +0.6% 0 74.4%
April 2026 148 +2.8% 0 77.7%
March 2026 122 +0.0% 2 76.2%
February 2026 109 −2.7% 3 90.8%
January 2026 118 +0.0% 8 88.1%
December 2025 130 −3.0% 2 76.9%
November 2025 138 −6.1% 9 84.8%
October 2025 190 +69.6% 0 76.8%
September 2025 154 0 86.4%
August 2025 158 2 81.0%
July 2025 149 13 63.1%
June 2025 160 5 73.8%
May 2025 159 1 79.9%
April 2025 144 0 77.8%
March 2025 122 2 84.4%
February 2025 112 0 83.0%
January 2025 118 8 89.8%
December 2024 134 0 82.8%
November 2024 147 0 90.5%
October 2024 112 0 85.7%

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