Historical on-time performance
Washington to Austin
1,297 miData through May 2026Source: US DOT · BTS
Flights on IAD–AUS arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 1,033 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time81%Medianon timep9030 minCancel0.9%Flights1,033
Why flights run late
Delay causes
- Airline26%
- Weather14%
- Air traffic (NAS)23%
- Late aircraft37%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline33%
- Weather56%
- Air traffic (NAS)11%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 9 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → AUS
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 90% on time.
- Mornings90% on time · p90 10 min · 944 flights
- Middays84% on time · p90 25 min · 898 flights
- Afternoons75% on time · p90 40 min · 269 flights
- Evenings72% on time · p90 60 min · 1,121 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 86% on time.
- Tuesdays86% on time · p90 20 min · 473 flights
- Fridays83% on time · p90 25 min · 509 flights
- Wednesdays82% on time · p90 25 min · 449 flights
- Thursdays81% on time · p90 30 min · 548 flights
- Mondays79% on time · p90 35 min · 513 flights
- Sundays77% on time · p90 50 min · 464 flights
- Saturdays72% on time · p90 50 min · 300 flights
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