Route on-time record
EWR to SAT: most on-time flights and the best time to fly
Newark (Newark Liberty International Airport) to San Antonio (San Antonio International Airport). 541 nonstop flights in Jun 2025 to May 2026, 87% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was United 591 at 7:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
EWR → SAT
Newark to San Antonio: 541 nonstop flights a year
On time (12 months)
87%
Cancelled
1.1%
avg delay 8 min
Best time to leave
Before 9 AM
91% on time vs 85% noon to 3 PM
Most reliable airline
United
86% chance on time
Lowest nonstop fare seen in the next two months: $337 (United 591 on 2026-11-06). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 591
7:15 AM → 10:34 AM4h 19m nonstop
Local times, typical schedule. Last flown 2026-05-29.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 1.2%
- Avg arrival delay
- 3 min
- Arrived on time 91% of the time (166 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; Noon to 3 PM: 85%).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 261 ground stops and delay programs started).
Moderate track record · 166 flights
Find United 591 fares Opens this date on Aviasales#2 · United 515
11:54 AM → 3:11 PM4h 17m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 1.1%
- Avg arrival delay
- 7 min
- Arrived on time 87% of the time (279 flights, Jun 2025 to May 2026).
- Departs outside EWR's trouble window (1 PM to 7 PM, when 65% of its 261 ground stops and delay programs started).
Strong track record · 279 flights
Find United 515 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines86%
530 flights · 87% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
164 flights · avg delay 3 min
- 9 AM to noon87%
198 flights · avg delay 7 min
- Noon to 3 PM85%
171 flights · avg delay 12 min
Best day: Tuesday (89%). Worst: Friday (80%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume32%
- Late-arriving aircraft30%
- Airline (crew, maintenance, boarding)29%
- Severe weather9%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
EWR to SAT questions
- What time of day is best to fly EWR to SAT?
- Before 9 AM: 91% of flights arrived on time, against 85% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from EWR to SAT?
- United, with a season-adjusted 86% chance of operating and arriving on time over 530 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on EWR to SAT?
- July (70% on time); the best was November (92%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from EWR
- SAT to EWR (return)
- EWR to MCO 76%
- EWR to ATL 77%
- EWR to ORD 71%
- EWR to LAX 72%
- EWR to FLL 75%
- EWR to SFO 71%
- EWR to MIA 77%
- EWR to BOS 71%
- EWR to CLT 80%
- EWR to IAH 79%
- EWR to DTW 79%
- EWR to PBI 77%
Most on-time flights from EWR on every route →
Live status: FAA delays and ground stops