PlainFlights

Route · ATL → SDF · 2020–2025 BTS data

Atlanta to Louisville

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ATL to SDF (Atlanta to Louisville) ranks #515 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

86.5%
On-time
+7.5 pts
vs US avg
63 min
Delay when late
16,535
Flights
#515 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Sep 2025 94%

Worst Month

Jul 2024 63%

Distance

321 mi

Carriers

18

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 215 41 7 0 DL
Nov 2025 214 39 4 0 DL
Oct 2025 229 24 0 1 DL
Sep 2025 222 14 0 0 DL
Aug 2025 241 36 1 3 DL
Jul 2025 230 48 2 1 DL,NK
Jun 2025 241 76 8 0 DL,OO,NK
May 2025 254 73 0 1 DL,OO,NK
Apr 2025 222 35 3 0 DL,WN
Mar 2025 239 39 1 2 DL,WN
Feb 2025 204 37 0 1 DL,WN
Jan 2025 210 28 12 0 DL,WN
Dec 2024 238 46 0 0 DL,WN
Nov 2024 226 17 0 1 WN,DL
Oct 2024 248 22 1 0 DL,WN
Sep 2024 233 30 0 0 WN,DL
Aug 2024 237 44 0 0 DL,WN
Jul 2024 252 92 18 2 DL,WN
Jun 2024 242 37 1 0 DL,WN
May 2024 262 55 0 2 DL,WN
Apr 2024 250 31 0 1 DL,WN
Mar 2024 249 34 0 0 DL,WN
Feb 2024 198 13 0 0 DL,WN
Jan 2024 212 34 0 1 DL,WN

ATL–SDF seasonal on-time pattern

Best: September (91.8%) · weakest: July (76.9%)

75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 85.8%

Strongest calendar month

September

91.8% on-time · ~235 flights/mo

Busiest calendar month

March

~255 flights/mo avg

Weakest calendar month

July

76.9% on-time · ~228 flights/mo

Cancellation Rate

1.0%

58 of 5,568 flights

Diversion Rate

0.3%

16 of 5,568 flights

Explore origin & destination

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

ATL - Atlanta

Full on-time, delay-cause, and seasonal performance for Atlanta, GA.

ATL 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 ATL and SDF side by side on delays, cancellations, and reliability.

Compare ATL vs SDF

Origin-hub reliability standing

Among ATL's stronger departures

ATL → SDF posts a 86.5% on-time rate, landing in the ≥85% band with 67 of 144 BTS-tracked routes leaving Atlanta. The same hub also shows 75 mid-band and 2 challenged departures · fleet-wide on-time rank #756 of 4927 (highest on-time = #1).

What the Data Says About ATL to SDF

Atlanta to Louisville (ATL to SDF) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.5% on-time rate across 16,535 flights, with delays that do happen averaging 62.9 minutes. The corridor runs roughly 321 miles and is served by 18 carriers. Over the most recent 24 months, 58 of 5,568 flights were cancelled (1.0%) and 16 diverted (0.3%).

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 94% on-time, while Jul 2024 came in at just 63% - a 30-point swing worth factoring into travel timing.

On the multi-year calendar, ATL–SDF peaks in September at 91.8% on-time while March carries the heaviest traffic (~255 flights per month) ; the softest month is July at 76.9%, a 14.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ATL to SDF rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ATL to SDF ranks #515 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 ATL to SDF? ▼
Flights from Atlanta to Louisville have a 86.5% on-time rate based on 16,535 flights. The average delay is 62.9 minutes. The best recent month was Sep 2025 with 94% on-time.
What is the cancellation rate for ATL to SDF? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (58 of 5,568 flights) and 0.3% were diverted.
How far is the flight from ATL to SDF? ▼
The flight distance from Atlanta (ATL) to Louisville (SDF) is approximately 321 miles. This route is served by 18 carriers.
When is the best time to fly from ATL to SDF? ▼
The best recent month for on-time performance was Sep 2025 (94% on-time). The worst was Jul 2024 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

ATL Airport

Atlanta
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 ATL–SDF data

ATL–SDF runs 7.5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare ATL and SDF airport profiles: delay causes and top routes differ even on the same corridor. ATL airport
  • If your dates flex, September (91.8% on-time) beats July (76.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 86.5% 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.