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725 km · Domestic

Washington Dulles (IAD) – Louisville Muhammad Ali (SDF)

In July 2026, 119 flights operated between Washington Dulles and Louisville Muhammad Ali (both directions), and 84.0% 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 periods14 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January55––
February54––
March114––
April1003▼ 97.0%
May6984▲ 21.7%
June59120▲ 103.4%
July116119▲ 2.6%
August92––
September48––
October––in progress
November1––
December–––

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods14 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January92.7%––
February92.6%––
March93.0%––
April93.0%100.0%▲ 7.5%
May92.8%89.3%▼ 3.8%
June84.7%85.8%▲ 1.3%
July87.9%84.0%▼ 4.4%
August97.8%––
September100.0%––
October––in progress
November100.0%––
December–––

Cancelled flights by month

The most recent periods14 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January7––
February2––
March0––
April00–
May00–
June00–
July05–
August0––
September0––
October––in progress
November0––
December–––

Airlines on this route

  1. Republic Airways 99.1%
  2. United Airlines 0.9%

Oct 1, 2024 – Jul 31, 2026

By direction

IAD → SDF

Scheduled flights
657
Flights operated
649
Cancelled
8 · 1.2%
On-time departures
89.8%

SDF → IAD

Scheduled flights
658
Flights operated
652
Cancelled
6 · 0.9%
On-time departures
92.6%

IAD → SDF and SDF → IAD counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Republic Airways YX 1,303 99.1% 91.4% 14
United Airlines UA 12 0.9% 75.0% 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 delay10:00–11:001.7min · 344 recorded · 341 measured
Gap to highest-delay hour7.2min10:00 ↔ 17:00
Recorded flights1,315IAD–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 · Fewer than 200 measured departures · 20 recorded · 20 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 173 recorded · 172 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 90.3% · 279 recorded · 277 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 37 recorded · 35 measured · Source: the US BTS 10:00 · 89.7% · 344 recorded · 341 measured · Source: the US BTS 11:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 46 recorded · 46 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 37 recorded · 37 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 5 recorded · 5 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 79 recorded · 79 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · 88.2% · 216 recorded · 212 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 55 recorded · 53 measured · Source: the US BTS 19:00 · No observations · 0 recorded · 0 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 · Fewer than 200 measured departures · 24 recorded · 24 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 · Fewer than 200 measured departures · 20 recorded · 20 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 173 recorded · 172 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 4.6 min · 279 recorded · 277 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 37 recorded · 35 measured · Source: the US BTS 10:00 · 1.7 min · 344 recorded · 341 measured · Source: the US BTS 11:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 46 recorded · 46 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 37 recorded · 37 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 5 recorded · 5 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 79 recorded · 79 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · 8.9 min · 216 recorded · 212 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 55 recorded · 53 measured · Source: the US BTS 19:00 · No observations · 0 recorded · 0 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 · Fewer than 200 measured departures · 24 recorded · 24 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 · 20 · 20 recorded · 20 measured · Source: the US BTS 06:00 · 173 · 173 recorded · 172 measured · Source: the US BTS 07:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 08:00 · 279 · 279 recorded · 277 measured · Source: the US BTS 09:00 · 37 · 37 recorded · 35 measured · Source: the US BTS 10:00 · 344 · 344 recorded · 341 measured · Source: the US BTS 11:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 12:00 · 46 · 46 recorded · 46 measured · Source: the US BTS 13:00 · 37 · 37 recorded · 37 measured · Source: the US BTS 14:00 · 5 · 5 recorded · 5 measured · Source: the US BTS 15:00 · 79 · 79 recorded · 79 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · 216 · 216 recorded · 212 measured · Source: the US BTS 18:00 · 55 · 55 recorded · 53 measured · Source: the US BTS 19:00 · No observations · 0 recorded · 0 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 · 24 · 24 recorded · 24 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.

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———
05:00Fewer than 200 measured departures—2020
06:00Fewer than 200 measured departures—172173
07:00No observations———
08:0090.3%4.6 min277279
09:00Fewer than 200 measured departures—3537
10:0089.7%1.7 min341344
11:00No observations———
12:00Fewer than 200 measured departures—4646
13:00Fewer than 200 measured departures—3737
14:00Fewer than 200 measured departures—55
15:00Fewer than 200 measured departures—7979
16:00No observations———
17:0088.2%8.9 min212216
18:00Fewer than 200 measured departures—5355
19:00No observations———
20:00No observations———
21:00No observations———
22:00Fewer than 200 measured departures—2424
23:00No observations———

Day of week

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 192 · 192 recorded · 189 measured · Source: the US BTS Tuesday · 180 · 180 recorded · 177 measured · Source: the US BTS Wednesday · 180 · 180 recorded · 179 measured · Source: the US BTS Thursday · 195 · 195 recorded · 194 measured · Source: the US BTS Friday · 192 · 192 recorded · 192 measured · Source: the US BTS Saturday · 179 · 179 recorded · 179 measured · Source: the US BTS Sunday · 197 · 197 recorded · 191 measured · Source: the US BTS

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

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
MondayFewer than 200 measured departures—189192
TuesdayFewer than 200 measured departures—177180
WednesdayFewer than 200 measured departures—179180
ThursdayFewer than 200 measured departures—194195
FridayFewer than 200 measured departures—192192
SaturdayFewer than 200 measured departures—179179
SundayFewer than 200 measured departures—191197

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 · 62 recorded · 55 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 56 recorded · 54 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 114 recorded · 114 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 103 recorded · 103 measured · Source: the US BTS May · Fewer than 200 measured departures · 153 recorded · 153 measured · Source: the US BTS Jun · Fewer than 200 measured departures · 179 recorded · 179 measured · Source: the US BTS Jul · 86.0% · 240 recorded · 235 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 92 recorded · 92 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 48 recorded · 48 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 80 recorded · 80 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 121 recorded · 121 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 67 recorded · 67 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 · 62 recorded · 55 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 56 recorded · 54 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 114 recorded · 114 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 103 recorded · 103 measured · Source: the US BTS May · Fewer than 200 measured departures · 153 recorded · 153 measured · Source: the US BTS Jun · Fewer than 200 measured departures · 179 recorded · 179 measured · Source: the US BTS Jul · 7.6 min · 240 recorded · 235 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 92 recorded · 92 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 48 recorded · 48 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 80 recorded · 80 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 121 recorded · 121 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 67 recorded · 67 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 · 62 · 62 recorded · 55 measured · Source: the US BTS Feb · 56 · 56 recorded · 54 measured · Source: the US BTS Mar · 114 · 114 recorded · 114 measured · Source: the US BTS Apr · 103 · 103 recorded · 103 measured · Source: the US BTS May · 153 · 153 recorded · 153 measured · Source: the US BTS Jun · 179 · 179 recorded · 179 measured · Source: the US BTS Jul · 240 · 240 recorded · 235 measured · Source: the US BTS Aug · 92 · 92 recorded · 92 measured · Source: the US BTS Sep · 48 · 48 recorded · 48 measured · Source: the US BTS Oct · 80 · 80 recorded · 80 measured · Source: the US BTS Nov · 121 · 121 recorded · 121 measured · Source: the US BTS Dec · 67 · 67 recorded · 67 measured · Source: the US BTS

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

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—5562
FebFewer than 200 measured departures—5456
MarFewer than 200 measured departures—114114
AprFewer than 200 measured departures—103103
MayFewer than 200 measured departures—153153
JunFewer than 200 measured departures—179179
Jul86.0%7.6 min235240
AugFewer than 200 measured departures—9292
SepFewer than 200 measured departures—4848
OctFewer than 200 measured departures—8080
NovFewer than 200 measured departures—121121
DecFewer than 200 measured departures—6767

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 90.3% 1,187
  • Delayed >15 min 8.7% 114
  • Cancelled 1.1% 14
  • 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

13
13 of 13
Flight numbersBy direction DeparturesOn time
YX3543 SDF → IAD 256 92.4%
YX3570 IAD → SDF 161 91.8%
YX3473 IAD → SDF 109 87.2%
YX3547 SDF → IAD 100 96.0%
YX3438 SDF → IAD 72 91.6%
YX3526 IAD → SDF 71 88.4%
YX3698 SDF → IAD 53 90.6%
YX3653 IAD → SDF 52 94.2%
YX3427 IAD → SDF 37 94.4%
YX3538 IAD → SDF 37 74.3%
YX3717 SDF → IAD 37 86.5%
YX3518 IAD → SDF 35 85.7%
YX3508 SDF → IAD 34 85.3%

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 119 +2.6% 5 84.0%
June 2026 120 +103.4% 0 85.8%
May 2026 84 +21.7% 0 89.3%
April 2026 3 −97.0% 0 100.0%
November 2025 1 −99.2% 0 100.0%
September 2025 48 0 100.0%
August 2025 92 0 97.8%
July 2025 116 0 87.9%
June 2025 59 0 84.7%
May 2025 69 0 92.8%
April 2025 100 0 93.0%
March 2025 114 0 93.0%
February 2025 54 2 92.6%
January 2025 55 7 92.7%
December 2024 67 0 91.0%
November 2024 120 0 96.7%
October 2024 80 0 92.5%

How to read this chart

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