SJU to DTW flight delays & on-time performance
Nonstop flights from Luis Munoz Marin International Airport to Detroit Metropolitan Wayne County Airport · 1,930 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SJU or DTW right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Juan (SJU) to Detroit (DTW) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.7% were cancelled, and 3% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (83% on time); Spirit Airlines was the least (75%).
- Departures scheduled around 2pm did best (87% on time); around 4pm did worst (56%).
- Friday was the most reliable day to fly (86% on time) and Sunday the least (80%).
- The largest source of delay minutes was late-arriving aircraft (65%).
Which airline is most on time from SJU to DTW?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 83% | 1.9% | 9 min | 2.8% | 324 |
| Spirit Airlines | 75% | 0.0% | 16 min | 9.4% | 33 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 1am92%12 flights
- 2pm87%198 flights
- 3pm80%118 flights
- 4pm56%29 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%0.0% cancelled
- Tuesday80%2.4% cancelled
- Wednesday85%0.0% cancelled
- Thursday83%0.0% cancelled
- Friday86%0.0% cancelled
- Saturday81%7.0% cancelled
- Sunday80%2.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft65%
- Air traffic control & airport congestion20%
- Airline (crew, maintenance, cleaning, fueling)14%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)67%
- Security33%
- Extreme weather0%
- Air traffic control & airport congestion0%
SJU to DTW: common questions
- How often are SJU to DTW flights on time?
- 82% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from San Juan to Detroit cancelled?
- 1.7% of scheduled flights were cancelled (6 of 357).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 47 min behind schedule on average, and 3.4% of flights were an hour or more late.
- How long is taxi time at SJU?
- Flights on this route spent 16 min taxiing from the gate to takeoff on average.
Related routes
Return trip: DTW to SJU — 76% on time
More flights from San Juan
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SJU → DTW, nonstop flights by US airlines that report to the DOT. How we calculate this.