Historical on-time performance
Washington to Phoenix
1,956 miData through May 2026Source: US DOT · BTS
Flights on IAD–PHX 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)
Cancelled0.7%of scheduled flights
based on 1,097 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 timep9030 minCancel0.8%Flights790
- Southwest AirlinesOn-time66%Median5 minp9050 minCancel0.7%Flights307
Why flights run late
Delay causes
- Airline25%
- Weather5%
- Air traffic (NAS)25%
- Late aircraft45%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline38%
- Weather63%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 8 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 → PHX
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 — 92% on time.
- Mornings92% on time · p90 5 min · 758 flights
- Middays88% on time · p90 15 min · 477 flights
- Afternoons78% on time · p90 35 min · 410 flights
- Evenings73% on time · p90 50 min · 1,423 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.
- Tuesdays84% on time · p90 25 min · 418 flights
- Saturdays82% on time · p90 30 min · 438 flights
- Sundays81% on time · p90 45 min · 450 flights
- Mondays81% on time · p90 25 min · 449 flights
- Wednesdays80% on time · p90 30 min · 418 flights
- Fridays79% on time · p90 45 min · 450 flights
- Thursdays78% on time · p90 30 min · 445 flights
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