DTW to SJU flight delays & on-time performance
Nonstop flights from Detroit Metropolitan Wayne County Airport to Luis Munoz Marin International Airport · 1,930 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at DTW or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Detroit (DTW) to San Juan (SJU) arrived on time 76% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.8% were cancelled, and 5% arrived an hour or more late.
- Spirit Airlines was the most punctual airline here (79% on time); Delta Air Lines was the least (76%).
- Departures scheduled around 9am did best (78% on time); around 10am did worst (69%).
- Thursday was the most reliable day to fly (85% on time) and Tuesday the least (69%).
- The largest source of delay minutes was air traffic control & airport congestion (49%).
Which airline is most on time from DTW to SJU?
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 |
|---|---|---|---|---|---|
| Spirit Airlines | 79% | 0.0% | 13 min | 5.9% | 34 |
| Delta Air Lines | 76% | 0.9% | 13 min | 4.4% | 324 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am75%12 flights
- 8am76%291 flights
- 9am78%37 flights
- 10am69%17 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday75%0.0% cancelled
- Tuesday69%0.0% cancelled
- Wednesday79%0.0% cancelled
- Thursday85%0.0% cancelled
- Friday79%0.0% cancelled
- Saturday74%5.3% cancelled
- Sunday71%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion49%
- Airline (crew, maintenance, cleaning, fueling)41%
- Late-arriving aircraft6%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Security67%
- Airline (crew, maintenance, cleaning, fueling)33%
- Extreme weather0%
- Air traffic control & airport congestion0%
DTW to SJU: common questions
- How often are DTW to SJU flights on time?
- 76% 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 Detroit to San Juan cancelled?
- 0.8% of scheduled flights were cancelled (3 of 358).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 47 min behind schedule on average, and 4.5% of flights were an hour or more late.
- How long is taxi time at DTW?
- Flights on this route spent 24 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to DTW — 82% on time
More flights from Detroit
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: DTW → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.