Historical on-time performance
Washington to Phoenix
1,956 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–PHX arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 1,152 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time82%Medianon timep9030 minCancel0.5%Flights846
- Southwest AirlinesOn-time66%Medianon timep9050 minCancel0.3%Flights306
Why flights run late
Delay causes
- Airline25%
- Weather7%
- Air traffic (NAS)29%
- Late aircraft39%
- 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 → PHX
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 73% to 90% on time.
- Mornings90% on time · p90 10 min · 812 flights
- Middays88% on time · p90 15 min · 373 flights
- Afternoons75% on time · p90 40 min · 311 flights
- Evenings73% on time · p90 45 min · 1,376 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 82% on time.
- Tuesdays82% on time · p90 25 min · 392 flights
- Saturdays81% on time · p90 35 min · 410 flights
- Mondays81% on time · p90 25 min · 419 flights
- Sundays80% on time · p90 40 min · 424 flights
- Wednesdays80% on time · p90 30 min · 391 flights
- Thursdays78% on time · p90 30 min · 417 flights
- Fridays78% on time · p90 45 min · 420 flights
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