Route · DTW → SJU · 2020–2025 BTS data
Detroit to San Juan
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), DTW to SJU (Detroit to San Juan) ranks #4466 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 80.4%
- On-time
- +1.4 pts
- vs US avg
- 59 min
- Delay when late
- 1,046
- Flights
- #4466 of 4927
- Corpus placement
Cancelled
0.0%
Best Month
Jul 2025 79%
Worst Month
Jun 2023 69%
Distance
1,930 mi
Carriers
4
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 43 | 16 | 0 | 0 | DL |
| Aug 2025 | 38 | 6 | 0 | 0 | NK,DL |
| Jul 2025 | 58 | 12 | 0 | 0 | DL,NK |
| Jun 2025 | 41 | 6 | 0 | 0 | NK,DL |
| May 2025 | 31 | 6 | 0 | 0 | DL |
| Apr 2025 | 32 | 7 | 0 | 0 | DL |
| Mar 2025 | 36 | 6 | 0 | 0 | DL |
| Feb 2025 | 32 | 8 | 0 | 0 | DL |
| Jan 2025 | 39 | 15 | 0 | 1 | DL |
| Dec 2024 | 44 | 11 | 0 | 0 | DL |
| Aug 2024 | 31 | 4 | 0 | 1 | DL |
| Jul 2024 | 31 | 7 | 0 | 0 | DL |
| Jun 2024 | 30 | 2 | 0 | 0 | DL |
| May 2024 | 30 | 7 | 0 | 1 | DL |
| Mar 2024 | 36 | 3 | 0 | 0 | DL |
| Feb 2024 | 33 | 3 | 0 | 0 | DL |
| Jan 2024 | 34 | 11 | 0 | 0 | DL |
| Dec 2023 | 31 | 0 | 0 | 0 | DL |
| Oct 2023 | 31 | 2 | 0 | 0 | DL |
| Sep 2023 | 35 | 4 | 0 | 0 | DL,NK |
| Aug 2023 | 62 | 14 | 0 | 1 | DL,NK |
| Jul 2023 | 64 | 14 | 0 | 0 | DL,F9,NK |
| Jun 2023 | 77 | 24 | 0 | 0 | DL,F9,NK |
| May 2023 | 66 | 14 | 0 | 0 | DL,F9,NK |
DTW–SJU seasonal on-time pattern
Best: October (93.5%) · weakest: January (74.0%)
Strongest calendar month
October
93.5% on-time · ~31 flights/mo
Busiest calendar month
July
~51 flights/mo avg
Weakest calendar month
January
74.0% on-time · ~35 flights/mo
Cancellation Rate
0.0%
0 of 985 flights
Diversion Rate
0.4%
4 of 985 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
DTW - Detroit
Full on-time, delay-cause, and seasonal performance for Detroit, MI.
DTW on-time profileSJU - San Juan
Full on-time, delay-cause, and seasonal performance for San Juan, PR.
SJU on-time profileCompare the two airports
See DTW and SJU side by side on delays, cancellations, and reliability.
Compare DTW vs SJUOrigin-hub reliability standing
Mid-pack among DTW departures
From DTW, this corridor sits with 60 other 75–85% on-time routes out of 94 tracked departures, not the hub's reliability leaders (34 at ≥85%) and not the softest ( 0 below 75%). Destination: San Juan · fleet on-time rank #2978 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to DTW–SJU.
Routes with a similar on-time rate
What the Data Says About DTW to SJU
1,046 tracked flights put the DTW to SJU pairing (Detroit to San Juan) at a 80.4% on-time rate, squarely in line with the wider network. Delays that do occur run 58.6 minutes on average. Across the 1,930-mile route and its 4 carriers, the trailing 24 months show 0.0% cancelled and 0.4% diverted (985 flights sampled).
Monthly performance varies moderately here: Jul 2025 was the strongest month at 79% on-time versus Jun 2023 at 69%, a 11-point difference.
On the multi-year calendar, DTW–SJU peaks in October at 93.5% on-time while July carries the heaviest traffic (~51 flights per month) ; the softest month is January at 74.0%, a 19.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does DTW to SJU rank among US routes by traffic? ▼
How often are flights delayed from DTW to SJU? ▼
What is the cancellation rate for DTW to SJU? ▼
How far is the flight from DTW to SJU? ▼
When is the best time to fly from DTW to SJU? ▼
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 DTW–SJU data
DTW–SJU is mid-pack at 80.4% on-time; month and carrier mix move more than the corridor headline.
- Compare DTW and SJU airport profiles: delay causes and top routes differ even on the same corridor. DTW airport
- If your dates flex, October (93.5% on-time) beats January (74.0%) on this corridor. Seasonal chart
- 4 other routes post a similar 80.4% 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.