Historical on-time performance
Phoenix to Washington
1,956 miData through Dec 2025Source: US DOT · BTS
Flights on PHX–IAD arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 1,153 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time84%Medianon timep9020 minCancel0.5%Flights847
- Southwest AirlinesOn-time77%Medianon timep9030 minCancel0.0%Flights306
Why flights run late
Delay causes
- Airline46%
- Weather2%
- Air traffic (NAS)23%
- Late aircraft26%
- Security3%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PHX → IAD
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 82% to 86% on time.
- Afternoons86% on time · p90 20 min · 359 flights
- Overnights85% on time · p90 20 min · 732 flights
- Mornings83% on time · p90 20 min · 1,312 flights
- Middays82% on time · p90 25 min · 466 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 80% to 87% on time.
- Mondays87% on time · p90 15 min · 418 flights
- Tuesdays86% on time · p90 15 min · 392 flights
- Saturdays86% on time · p90 20 min · 412 flights
- Wednesdays85% on time · p90 25 min · 396 flights
- Fridays82% on time · p90 25 min · 421 flights
- Thursdays81% on time · p90 25 min · 414 flights
- Sundays80% on time · p90 25 min · 424 flights
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