Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

IAD to AUS: most on-time flights and the best time to fly

Dulles (Washington Dulles International Airport) to Austin (Austin Bergstrom International Airport). 1,074 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 637 at 8:23 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

Find me the most reliable flights fromtoonreturning(optional)

IAD → AUS

Dulles to Austin: 1,074 nonstop flights a year

On time (12 months)

83%

Cancelled

0.8%

avg delay 13 min

Best time to leave

Before 9 AM

92% on time vs 73% 3 to 6 PM

Most reliable airline

United

82% chance on time

Check IAD to AUS fares

Lowest nonstop fare seen in the next two months: $231 (United 2337 on 2026-11-10). 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. #1 · United 637

    8:23 AM → 11:08 AM3h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    91%

    chance on time

    On time (history)
    92%
    Cancelled
    0.7%
    Avg arrival delay
    4 min
    • Arrived on time 92% of the time (283 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 73%).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • Lands inside AUS's trouble window: 79% of its 92 ground stops and delay programs started between 10 AM and 4 PM.

    Strong track record · 283 flights

    Find United 637 fares Opens this date on Aviasales

  2. #2 · United 2746

    12:50 PM → 3:36 PM3h 46m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 84% of the time (91 flights, Jun 2025 to May 2026).
    • Never cancelled in 91 scheduled flights.
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • Lands inside AUS's trouble window: 79% of its 92 ground stops and delay programs started between 10 AM and 4 PM.

    Moderate track record · 91 flights

    Find United 2746 fares Opens this date on Aviasales

  3. #3 · United 2337

    5:55 PM → 8:43 PM3h 48m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    77%

    chance on time

    On time (history)
    80%
    Cancelled
    0.8%
    Avg arrival delay
    14 min
    • Arrived on time 80% of the time (240 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 73% on time; Before 9 AM: 92%).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 240 flights

    Find United 2337 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines82%

    1,033 flights · 82% on time as flown · 0.9% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM92%

    318 flights · avg delay 3 min

  • Noon to 3 PM86%

    316 flights · avg delay 10 min

  • 3 to 6 PM73%

    409 flights · avg delay 22 min

Best day: Tuesday (86%). Worst: Saturday (74%).

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.

J
79
F
88
M
85
A
84
M
76
J
70
J
70
A
79
S
86
O
89
N
89
D
85

What delays this route

  • Late-arriving aircraft37%
  • Airline (crew, maintenance, boarding)26%
  • Air traffic control and airport volume23%
  • Severe weather14%

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

Finding the most reliable connections from IAD to AUS…

IAD to AUS questions

What time of day is best to fly IAD to AUS?
Before 9 AM: 92% of flights arrived on time, against 73% 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 IAD to AUS?
United, with a season-adjusted 82% 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 IAD to AUS?
July (70% on time); the best was November (89%), 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 IAD

Most on-time flights from IAD on every route →

Live status: FAA delays and ground stops