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Route · SJU → DTW · 2020–2025 BTS data

San Juan to Detroit

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SJU to DTW (San Juan to Detroit) ranks #4441 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

83.4%
On-time
+4.4 pts
vs US avg
82 min
Delay when late
1,079
Flights
#4441 of 4927
Corpus placement

Cancelled

0.5%

Best Month

May 2023 92%

Worst Month

Jun 2023 73%

Distance

1,930 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 43 10 1 0 DL
Aug 2025 38 11 0 0 NK,DL
Jul 2025 58 5 1 0 DL,NK
Jun 2025 42 5 0 0 NK,DL
May 2025 31 3 0 0 DL
Apr 2025 32 2 0 0 DL
Mar 2025 36 5 0 0 DL
Feb 2025 32 8 0 0 DL
Jan 2025 39 14 0 1 DL
Dec 2024 44 11 1 1 DL
Aug 2024 31 7 0 0 DL
Jul 2024 31 4 0 0 DL
Jun 2024 30 5 0 0 DL
May 2024 30 8 1 1 DL
Mar 2024 36 10 0 0 DL
Feb 2024 33 5 0 0 DL
Jan 2024 34 7 0 0 DL
Dec 2023 31 0 0 0 DL
Oct 2023 31 3 0 0 DL
Sep 2023 36 2 0 0 DL,NK
Aug 2023 62 11 0 2 DL,NK
Jul 2023 64 16 0 0 DL,F9,NK
Jun 2023 77 21 1 0 DL,F9,NK
May 2023 66 5 0 0 DL,F9,NK

SJU–DTW seasonal on-time pattern

Best: September (94.4%) · weakest: August (77.9%)

75%80%85%90%95%100% JanFebMarAprMayJunJulAugSepOctDec 82.2%

Strongest calendar month

September

94.4% on-time · ~36 flights/mo

Busiest calendar month

July

~51 flights/mo avg

Weakest calendar month

August

77.9% on-time · ~44 flights/mo

Cancellation Rate

0.5%

5 of 987 flights

Diversion Rate

0.5%

5 of 987 flights

Explore origin & destination

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

SJU - San Juan

Full on-time, delay-cause, and seasonal performance for San Juan, PR.

SJU on-time profile

DTW - Detroit

Full on-time, delay-cause, and seasonal performance for Detroit, MI.

DTW on-time profile

Compare the two airports

See SJU and DTW side by side on delays, cancellations, and reliability.

Compare SJU vs DTW

Origin-hub reliability standing

Mid-pack among SJU departures

From SJU, this corridor sits with 14 other 75–85% on-time routes out of 21 tracked departures, not the hub's reliability leaders (1 at ≥85%) and not the softest ( 6 below 75%). Destination: Detroit · fleet on-time rank #1813 of 4927.

What the Data Says About SJU to DTW

Bureau of Transportation Statistics records show San Juan to Detroit (SJU to DTW) running a 83.4% on-time rate over 1,079 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 81.6 minutes. The 1,930-mile corridor is served by 4 carriers, and over the last 24 months 0.5% of 987 flights were cancelled, 0.5% diverted.

The monthly split is wide on this route: May 2023 posted the strongest performance at 92% on-time, while Jun 2023 came in at just 73% - a 20-point swing worth factoring into travel timing.

On the multi-year calendar, SJU–DTW peaks in September at 94.4% on-time while July carries the heaviest traffic (~51 flights per month) ; the softest month is August at 77.9%, a 16.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SJU to DTW rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SJU to DTW ranks #4441 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 SJU to DTW? ▼
Flights from San Juan to Detroit have a 83.4% on-time rate based on 1,079 flights. The average delay is 81.6 minutes. The best recent month was May 2023 with 92% on-time.
What is the cancellation rate for SJU to DTW? ▼
Over the last 24 months, 0.5% of flights on this route were cancelled (5 of 987 flights) and 0.5% were diverted.
How far is the flight from SJU to DTW? ▼
The flight distance from San Juan (SJU) to Detroit (DTW) is approximately 1,930 miles. This route is served by 4 carriers.
When is the best time to fly from SJU to DTW? ▼
The best recent month for on-time performance was May 2023 (92% on-time). The worst was Jun 2023 (73% on-time). Consider booking during months with historically better performance.

Airports on this route

SJU Airport

San Juan
DTW Airport

Detroit
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 SJU–DTW data

SJU–DTW runs 4.4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SJU and DTW airport profiles: delay causes and top routes differ even on the same corridor. SJU airport
  • If your dates flex, September (94.4% on-time) beats August (77.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 83.4% 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.

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.