Route · SDF → BOS · 2020–2025 BTS data
Louisville to Boston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SDF to BOS (Louisville to Boston) ranks #3790 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 77.1%
- On-time
- -1.9 pts
- vs US avg
- 73 min
- Delay when late
- 2,059
- Flights
- #3790 of 4927
- Corpus placement
Cancelled
1.0%
Best Month
Feb 2024 91%
Worst Month
Sep 2025 40%
Distance
829 mi
Carriers
6
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 58 | 8 | 1 | 0 | YX |
| Nov 2025 | 59 | 12 | 0 | 0 | YX |
| Oct 2025 | 61 | 29 | 1 | 0 | YX,MQ |
| Sep 2025 | 60 | 36 | 2 | 1 | MQ,YX |
| Aug 2025 | 61 | 12 | 0 | 1 | YX,MQ |
| Jul 2025 | 61 | 18 | 1 | 0 | YX |
| Jun 2025 | 60 | 28 | 0 | 0 | YX |
| May 2025 | 66 | 28 | 0 | 0 | YX,DL,MQ |
| Apr 2025 | 58 | 16 | 0 | 0 | MQ,YX |
| Mar 2025 | 52 | 11 | 0 | 0 | YX |
| Feb 2025 | 42 | 13 | 0 | 0 | YX |
| Jan 2025 | 52 | 8 | 2 | 0 | YX |
| Dec 2024 | 55 | 8 | 2 | 0 | YX |
| Nov 2024 | 57 | 10 | 0 | 0 | YX |
| Oct 2024 | 61 | 8 | 0 | 0 | YX |
| Sep 2024 | 59 | 14 | 0 | 0 | YX |
| Aug 2024 | 58 | 17 | 1 | 2 | YX |
| Jul 2024 | 59 | 15 | 1 | 0 | YX |
| Jun 2024 | 59 | 15 | 2 | 0 | YX |
| May 2024 | 62 | 21 | 0 | 1 | DL,YX |
| Apr 2024 | 56 | 12 | 0 | 0 | YX |
| Mar 2024 | 61 | 7 | 0 | 0 | YX |
| Feb 2024 | 54 | 5 | 0 | 0 | YX |
| Jan 2024 | 52 | 13 | 1 | 0 | YX |
SDF–BOS seasonal on-time pattern
Best: December (87.7%) · weakest: September (66.5%)
Strongest calendar month
December
87.7% on-time · ~51 flights/mo
Busiest calendar month
May
~72 flights/mo avg
Weakest calendar month
September
66.5% on-time · ~70 flights/mo
Cancellation Rate
1.0%
14 of 1,383 flights
Diversion Rate
0.4%
5 of 1,383 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
SDF on-time profileBOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
BOS on-time profileCompare the two airports
See SDF and BOS side by side on delays, cancellations, and reliability.
Compare SDF vs BOSOrigin-hub reliability standing
Mid-pack among SDF departures
From SDF, this corridor sits with 13 other 75–85% on-time routes out of 23 tracked departures, not the hub's reliability leaders (9 at ≥85%) and not the softest ( 1 below 75%). Destination: Boston · fleet on-time rank #4076 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SDF–BOS.
Routes with a similar on-time rate
What the Data Says About SDF to BOS
The Louisville to Boston corridor (SDF to BOS) posts a 77.1% on-time rate on the lower edge of the average band, based on 2,059 tracked flights. Late flights run 73.0 minutes behind on average. 6 carriers cover the 829-mile route; over the last 24 months, 14 of 1,383 flights were cancelled (1.0%) and 0.4% diverted.
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 91% on-time, while Sep 2025 came in at just 40% - a 51-point swing worth factoring into travel timing.
On the multi-year calendar, SDF–BOS peaks in December at 87.7% on-time while May carries the heaviest traffic (~72 flights per month) ; the softest month is September at 66.5%, a 21.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SDF to BOS rank among US routes by traffic? ▼
How often are flights delayed from SDF to BOS? ▼
What is the cancellation rate for SDF to BOS? ▼
How far is the flight from SDF to BOS? ▼
When is the best time to fly from SDF to BOS? ▼
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 SDF–BOS data
SDF–BOS is mid-pack at 77.1% on-time; month and carrier mix move more than the corridor headline.
- Compare SDF and BOS airport profiles: delay causes and top routes differ even on the same corridor. SDF airport
- If your dates flex, December (87.7% on-time) beats September (66.5%) on this corridor. Seasonal chart
- 4 other routes post a similar 77.1% 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.
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.