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Route · PHL → SDF · 2020–2025 BTS data

Philadelphia to Louisville

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PHL to SDF (Philadelphia to Louisville) ranks #3612 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

83.1%
On-time
+4.1 pts
vs US avg
82 min
Delay when late
2,337
Flights
#3612 of 4927
Corpus placement

Cancelled

2.4%

Best Month

Sep 2023 93%

Worst Month

May 2025 69%

Distance

576 mi

Carriers

7

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Oct 2025 86 18 0 0 OH,YX
Sep 2025 66 7 1 1 OH,YX
Aug 2025 36 11 2 0 YX,OH
Jul 2025 56 14 5 1 OH,YX
Jun 2025 34 14 3 0 OH,YX
May 2025 52 16 1 0 AA,OH,YX
Oct 2024 56 9 0 0 YX,OH
Sep 2024 92 11 0 0 YX,OH
Aug 2024 62 15 6 0 YX,OH
Jul 2024 87 24 1 1 OH,YX
Jun 2024 58 13 1 0 OH,YX
May 2024 56 13 1 0 AA,OH,YX
Mar 2024 30 5 0 0 OH
Oct 2023 35 3 0 0 OH,YX
Sep 2023 58 4 3 0 YX
Aug 2023 57 6 0 1 OH,YX
Jul 2023 57 16 2 0 YX,OH
Jun 2023 84 10 3 0 OH,YX
May 2023 56 7 0 1 AA,YX,OH
Apr 2023 30 6 0 0 YX
Mar 2023 31 2 1 0 YX
Jan 2023 40 3 0 0 YX
Dec 2022 48 10 2 0 YX,OH
Nov 2022 54 10 0 0 OH,YX

PHL–SDF seasonal on-time pattern

Best: January (91.7%) · weakest: June (75.3%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 84.8%

Strongest calendar month

January

91.7% on-time · ~44 flights/mo

Busiest calendar month

September

~60 flights/mo avg

Weakest calendar month

June

75.3% on-time · ~53 flights/mo

Cancellation Rate

2.4%

32 of 1,321 flights

Diversion Rate

0.4%

5 of 1,321 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

PHL - Philadelphia

Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.

PHL on-time profile

SDF - Louisville

Full on-time, delay-cause, and seasonal performance for Louisville, KY.

SDF on-time profile

Compare the two airports

See PHL and SDF side by side on delays, cancellations, and reliability.

Compare PHL vs SDF

Origin-hub reliability standing

Mid-pack among PHL departures

From PHL, this corridor sits with 60 other 75–85% on-time routes out of 65 tracked departures, not the hub's reliability leaders (4 at ≥85%) and not the softest ( 1 below 75%). Destination: Louisville · fleet on-time rank #1924 of 4927.

What the Data Says About PHL to SDF

Bureau of Transportation Statistics records show Philadelphia to Louisville (PHL to SDF) running a 83.1% on-time rate over 2,337 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 82.2 minutes. The 576-mile corridor is served by 7 carriers, and over the last 24 months 2.4% of 1,321 flights were cancelled, 0.4% diverted.

The monthly split is wide on this route: Sep 2023 posted the strongest performance at 93% on-time, while May 2025 came in at just 69% - a 24-point swing worth factoring into travel timing.

On the multi-year calendar, PHL–SDF peaks in January at 91.7% on-time while September carries the heaviest traffic (~60 flights per month) ; the softest month is June at 75.3%, a 16.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does PHL to SDF rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, PHL to SDF ranks #3612 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from PHL to SDF? ▼
Flights from Philadelphia to Louisville have a 83.1% on-time rate based on 2,337 flights. The average delay is 82.2 minutes. The best recent month was Sep 2023 with 93% on-time.
What is the cancellation rate for PHL to SDF? ▼
Over the last 24 months, 2.4% of flights on this route were cancelled (32 of 1,321 flights) and 0.4% were diverted.
How far is the flight from PHL to SDF? ▼
The flight distance from Philadelphia (PHL) to Louisville (SDF) is approximately 576 miles. This route is served by 7 carriers.
When is the best time to fly from PHL to SDF? ▼
The best recent month for on-time performance was Sep 2023 (93% on-time). The worst was May 2025 (69% on-time). Consider booking during months with historically better performance.

Airports on this route

PHL Airport

Philadelphia
SDF Airport

Louisville
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using PHL–SDF data

PHL–SDF runs 4.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare PHL and SDF airport profiles: delay causes and top routes differ even on the same corridor. PHL airport
  • If your dates flex, January (91.7% on-time) beats June (75.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 83.1% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.