Route · BOS → SDF · 2020–2025 BTS data
Boston to Louisville
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to SDF (Boston to Louisville) ranks #3789 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 88.3%
- On-time
- +9.3 pts
- vs US avg
- 66 min
- Delay when late
- 2,059
- Flights
- #3789 of 4927
- Corpus placement
Cancelled
0.4%
Best Month
Mar 2024 98%
Worst Month
Dec 2025 74%
Distance
829 mi
Carriers
6
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 58 | 15 | 1 | 1 | YX |
| Nov 2025 | 59 | 5 | 0 | 0 | YX |
| Oct 2025 | 61 | 9 | 0 | 0 | YX,MQ |
| Sep 2025 | 60 | 6 | 0 | 0 | MQ,YX |
| Aug 2025 | 61 | 8 | 0 | 0 | YX,MQ |
| Jul 2025 | 61 | 9 | 1 | 1 | YX |
| Jun 2025 | 60 | 10 | 0 | 1 | YX |
| May 2025 | 66 | 8 | 0 | 0 | YX,DL,MQ |
| Apr 2025 | 58 | 4 | 0 | 0 | MQ,YX |
| Mar 2025 | 52 | 3 | 0 | 0 | YX |
| Feb 2025 | 42 | 12 | 0 | 0 | YX |
| Jan 2025 | 51 | 6 | 2 | 0 | YX |
| Dec 2024 | 56 | 7 | 0 | 0 | YX |
| Nov 2024 | 57 | 4 | 0 | 0 | YX |
| Oct 2024 | 61 | 2 | 0 | 0 | YX |
| Sep 2024 | 59 | 1 | 0 | 0 | YX |
| Aug 2024 | 58 | 4 | 0 | 0 | YX |
| Jul 2024 | 59 | 6 | 0 | 1 | YX |
| Jun 2024 | 59 | 5 | 0 | 0 | YX |
| May 2024 | 62 | 11 | 0 | 0 | DL,YX |
| Apr 2024 | 56 | 4 | 0 | 0 | YX |
| Mar 2024 | 61 | 1 | 0 | 0 | YX |
| Feb 2024 | 54 | 1 | 1 | 0 | YX |
| Jan 2024 | 51 | 11 | 0 | 0 | YX |
BOS–SDF seasonal on-time pattern
Best: March (96.5%) · weakest: July (82.2%)
Strongest calendar month
March
96.5% on-time · ~57 flights/mo
Busiest calendar month
May
~72 flights/mo avg
Weakest calendar month
July
82.2% on-time · ~69 flights/mo
Cancellation Rate
0.4%
5 of 1,382 flights
Diversion Rate
0.3%
4 of 1,382 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
BOS on-time profileSDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
SDF on-time profileCompare the two airports
See BOS and SDF side by side on delays, cancellations, and reliability.
Compare BOS vs SDFOrigin-hub reliability standing
Among BOS's stronger departures
BOS → SDF posts a 88.3% on-time rate, landing in the ≥85% band with 6 of 60 BTS-tracked routes leaving Boston. The same hub also shows 49 mid-band and 5 challenged departures · fleet-wide on-time rank #359 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to BOS–SDF.
Routes with a similar on-time rate
What the Data Says About BOS to SDF
Boston to Louisville (BOS to SDF) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88.3% on-time rate across 2,059 flights, with delays that do happen averaging 66.2 minutes. The corridor runs roughly 829 miles and is served by 6 carriers. Over the most recent 24 months, 5 of 1,382 flights were cancelled (0.4%) and 4 diverted (0.3%).
The monthly split is wide on this route: Mar 2024 posted the strongest performance at 98% on-time, while Dec 2025 came in at just 74% - a 24-point swing worth factoring into travel timing.
On the multi-year calendar, BOS–SDF peaks in March at 96.5% on-time while May carries the heaviest traffic (~72 flights per month) ; the softest month is July at 82.2%, a 14.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does BOS to SDF rank among US routes by traffic? ▼
How often are flights delayed from BOS to SDF? ▼
What is the cancellation rate for BOS to SDF? ▼
How far is the flight from BOS to SDF? ▼
When is the best time to fly from BOS to SDF? ▼
Airports on this route
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 BOS–SDF data
BOS–SDF runs 9.3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare BOS and SDF airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
- If your dates flex, March (96.5% on-time) beats July (82.2%) on this corridor. Seasonal chart
- 4 other routes post a similar 88.3% 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.
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.