Newark (EWR) to San Antonio (SAT): On-Time Performance
Data through July 2026
Newark (EWR) to San Antonio (SAT) effectively runs on two schedules. In November 2025, 95% of arrivals were on time; in May 2025 that fell to 68% — a 26-point seasonal swing. Across the full period the route averages 84% on-time against a national 78%.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 1.6
- last 12 months
- Duration
- 4h 13m
- scheduled
- Distance
- 1,569 mi
Best airline from EWR to SAT
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 85% | 11 min | 0.8% | 1,151 |
| Spirit Airlines | 81% | 13 min | 3.6% | 138 |
Monthly on-time trend
Best time to fly from EWR to SAT
Aim for departures around 6 a.m. (90% on-time); avoid 9 a.m. departures (74%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 85% | 10 min |
| Tuesdaybest | 91% | 6 min |
| Wednesday | 85% | 14 min |
| Thursday | 86% | 8 min |
| Friday | 80% | 16 min |
| Saturday | 80% | 14 min |
| Sunday | 82% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft35%
- Airline operations35%
- National airspace system26%
- Weather4%
Frequently asked questions
- How often are flights from EWR to SAT delayed?
- 16% of EWR–SAT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from EWR to SAT?
- United Airlines has the best on-time record on this route at 85%, based on 1,151 flights. 2 airlines flew EWR–SAT frequently enough to compare in this period.
- What is the best time of day to fly from EWR to SAT?
- Departures around 6 a.m. have the best record (90% on-time), while departures around 9 a.m. have the worst (74%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from EWR to SAT?
- The scheduled EWR–SAT flight time averages 4h 13m over 1,569 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are EWR to SAT flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from EWR to SAT?
- May 2025 was the roughest month in this dataset, with only 68% of arrivals on time. The best was November 2025 at 95%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 1,289 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.