PHX to IAD flight delays & on-time performance
Nonstop flights from Phoenix Sky Harbor International Airport to Washington Dulles International Airport · 1,956 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at PHX or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Phoenix (PHX) to Washington (IAD) arrived on time 86% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.7% were cancelled, and 3% arrived an hour or more late.
- United Airlines was the most punctual airline here (91% on time); Southwest Airlines was the least (74%).
- Departures scheduled around 11pm did best (94% on time); around 10am did worst (74%).
- Wednesday was the most reliable day to fly (90% on time) and Sunday the least (79%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (45%).
Which airline is most on time from PHX to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 91% | 0.8% | 8 min | 3.2% | 731 |
| Southwest Airlines | 74% | 0.3% | 12 min | 2.6% | 306 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am93%82 flights
- 8am85%303 flights
- 9am88%82 flights
- 10am74%96 flights
- 11am82%78 flights
- 12pm57%23 flights
- 1pm87%134 flights
- 2pm100%11 flights
- 3pm91%119 flights
- 11pm94%103 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%0.7% cancelled
- Tuesday86%0.0% cancelled
- Wednesday90%1.4% cancelled
- Thursday85%0.0% cancelled
- Friday86%0.0% cancelled
- Saturday89%0.0% cancelled
- Sunday79%2.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)45%
- Late-arriving aircraft30%
- Air traffic control & airport congestion19%
- Security4%
- Extreme weather1%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather71%
- Airline (crew, maintenance, cleaning, fueling)29%
- Air traffic control & airport congestion0%
- Security0%
PHX to IAD: common questions
- How often are PHX to IAD flights on time?
- 86% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Phoenix to Washington cancelled?
- 0.7% of scheduled flights were cancelled (7 of 1,037).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 53 min behind schedule on average, and 3.0% of flights were an hour or more late.
- How long is taxi time at PHX?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to PHX — 82% on time
More flights from Phoenix
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: PHX → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.