Historical on-time performance
Phoenix to Washington
1,956 miData through May 2026Source: US DOT · BTS
Flights on PHX–IAD arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,098 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time87%Medianon timep9015 minCancel0.8%Flights791
- Southwest AirlinesOn-time70%Medianon timep9035 minCancel0.3%Flights307
Why flights run late
Delay causes
- Airline51%
- Weather1%
- Air traffic (NAS)20%
- Late aircraft25%
- Security3%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline29%
- Weather71%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 7 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 PHX → IAD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 81% to 88% on time.
- Afternoons88% on time · p90 15 min · 377 flights
- Overnights85% on time · p90 20 min · 686 flights
- Mornings84% on time · p90 20 min · 1,370 flights
- Middays81% on time · p90 25 min · 628 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 87% on time.
- Mondays87% on time · p90 15 min · 445 flights
- Saturdays86% on time · p90 15 min · 440 flights
- Wednesdays86% on time · p90 20 min · 423 flights
- Tuesdays86% on time · p90 20 min · 418 flights
- Fridays84% on time · p90 25 min · 450 flights
- Thursdays83% on time · p90 20 min · 442 flights
- Sundays78% on time · p90 30 min · 451 flights
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