Route on-time record
SAT to IAD: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Dulles (Washington Dulles International Airport). 636 nonstop flights in Jun 2025 to May 2026, 93% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 471 at 7:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → IAD
San Antonio to Dulles: 636 nonstop flights a year
On time (12 months)
93%
Cancelled
0.6%
avg delay 7 min
Best time to leave
Before 9 AM
96% on time vs 86% 9 AM to noon
Most reliable airline
United
93% chance on time
Lowest nonstop fare seen in the next two months: $263 (United 471 on 2026-11-29). 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 471
7:15 AM → 11:36 AM3h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31.
95%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.8%
- Avg arrival delay
- 5 min
- Arrived on time 96% of the time (243 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; 9 AM to noon: 86%).
Strong track record · 243 flights
Find United 471 fares Opens this date on Aviasales#2 · United 2250
12:17 PM → 4:30 PM3h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.6%
- Avg arrival delay
- 9 min
- Arrived on time 90% of the time (315 flights, Jun 2025 to May 2026).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 315 flights
Find United 2250 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines93%
636 flights · 93% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM96%
313 flights · avg delay 4 min
- 9 AM to noon86%
95 flights · avg delay 16 min
- Noon to 3 PM92%
228 flights · avg delay 6 min
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
- Late-arriving aircraft44%
- Airline (crew, maintenance, boarding)42%
- Air traffic control and airport volume14%
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
SAT to IAD questions
- What time of day is best to fly SAT to IAD?
- Before 9 AM: 96% of flights arrived on time, against 86% for departures 9 AM to noon. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SAT to IAD?
- United, with a season-adjusted 93% chance of operating and arriving on time over 636 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 SAT to IAD?
- June (83% on time); the best was April (96%), 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 SAT
- IAD to SAT (return)
- SAT to DFW 77%
- SAT to ATL 85%
- SAT to DEN 81%
- SAT to DAL 84%
- SAT to PHX 83%
- SAT to IAH 81%
- SAT to LAS 83%
- SAT to ORD 76%
- SAT to LAX 87%
- SAT to HOU 74%
- SAT to CLT 86%
- SAT to MCO 77%
Most on-time flights from SAT on every route →
Live status: FAA delays and ground stops