Historical on-time performance
Washington to Austin
1,297 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–AUS arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,065 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time79%Medianon timep9035 minCancel0.6%Flights1,065
Why flights run late
Delay causes
- Airline27%
- Weather12%
- Air traffic (NAS)28%
- Late aircraft33%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 89% on time.
- Mornings89% on time · p90 10 min · 944 flights
- Middays85% on time · p90 25 min · 935 flights
- Afternoons75% on time · p90 35 min · 292 flights
- Evenings72% on time · p90 60 min · 1,128 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 85% on time.
- Fridays85% on time · p90 25 min · 509 flights
- Tuesdays85% on time · p90 20 min · 489 flights
- Wednesdays83% on time · p90 25 min · 461 flights
- Mondays80% on time · p90 30 min · 521 flights
- Thursdays80% on time · p90 35 min · 572 flights
- Sundays78% on time · p90 50 min · 484 flights
- Saturdays72% on time · p90 50 min · 290 flights
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