Route on-time record
AUS to IAD: most on-time flights and the best time to fly
Austin (Austin Bergstrom International Airport) to Dulles (Washington Dulles International Airport). 1,074 nonstop flights in Jun 2025 to May 2026, 89% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 525 at 7:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
AUS → IAD
Austin to Dulles: 1,074 nonstop flights a year
On time (12 months)
89%
Cancelled
0.8%
avg delay 11 min
Best time to leave
Before 9 AM
93% on time vs 83% 3 to 6 PM
Most reliable airline
United
88% chance on time
Lowest nonstop fare seen in the next two months: $240 (United 2344 on 2026-11-12). 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 525
7:15 AM → 11:31 AM3h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.9%
- Avg arrival delay
- 4 min
- Arrived on time 93% of the time (323 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 83%).
- Departs outside AUS's trouble window (10 AM to 4 PM, when 79% of its 92 ground stops and delay programs started).
Strong track record · 323 flights
Find United 525 fares Opens this date on Aviasales#2 · United 2344
12:14 PM → 4:30 PM3h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.7%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (301 flights, Jun 2025 to May 2026).
- Departs inside AUS's trouble window: 79% of its 92 ground stops and delay programs started between 10 AM and 4 PM.
- 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 · 301 flights
Find United 2344 fares Opens this date on Aviasales#3 · United 376
4:57 PM → 9:13 PM3h 16m nonstop
Local times, typical schedule. Last flown 2026-05-29.
83%
chance on time
- On time (history)
- 84%
- Cancelled
- 1.1%
- Avg arrival delay
- 15 min
- Arrived on time 84% of the time (274 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 83% on time; Before 9 AM: 93%).
- Departs outside AUS's trouble window (10 AM to 4 PM, when 79% of its 92 ground stops and delay programs started).
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 274 flights
Find United 376 fares Opens this date on Aviasales#4 · United 2031
4:47 PM → 9:03 PM3h 16m nonstop
Local times, typical schedule. Last flown 2026-05-20.
82%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 76% of the time (17 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 83% on time; Before 9 AM: 93%).
- Departs outside AUS's trouble window (10 AM to 4 PM, when 79% of its 92 ground stops and delay programs started).
Limited track record · 17 flights
Find United 2031 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines88%
1,033 flights · 89% on time as flown · 0.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM93%
346 flights · avg delay 4 min
- 9 AM to noon91%
77 flights · avg delay 4 min
- Noon to 3 PM89%
336 flights · avg delay 6 min
- 3 to 6 PM83%
315 flights · avg delay 23 min
Best day: Wednesday (90%). Worst: Friday (84%).
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
- Airline (crew, maintenance, boarding)36%
- Late-arriving aircraft36%
- Air traffic control and airport volume25%
- Severe weather3%
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
AUS to IAD questions
- What time of day is best to fly AUS to IAD?
- Before 9 AM: 93% of flights arrived on time, against 83% for departures 3 to 6 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 AUS to IAD?
- United, with a season-adjusted 88% chance of operating and arriving on time over 1,033 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 AUS to IAD?
- July (77% on time); the best was April (94%), 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 AUS
- IAD to AUS (return)
- AUS to DEN 78%
- AUS to DFW 73%
- AUS to ATL 81%
- AUS to LAX 82%
- AUS to PHX 79%
- AUS to ORD 73%
- AUS to BNA 77%
- AUS to LAS 75%
- AUS to SFO 76%
- AUS to MCO 73%
- AUS to IAH 76%
- AUS to SAN 75%
Most on-time flights from AUS on every route →
Live status: FAA delays and ground stops