IAD to PHX flight delays & on-time performance
Nonstop flights from Washington Dulles International Airport to Phoenix Sky Harbor International Airport · 1,956 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAD or PHX right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Washington (IAD) to Phoenix (PHX) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.8% were cancelled, and 4% arrived an hour or more late.
- United Airlines was the most punctual airline here (86% on time); Southwest Airlines was the least (71%).
- Departures scheduled around 8am did best (97% on time); around 6pm did worst (56%).
- Tuesday was the most reliable day to fly (86% on time) and Wednesday the least (77%).
- The largest source of delay minutes was late-arriving aircraft (38%).
Which airline is most on time from IAD to PHX?
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 | 86% | 0.8% | 10 min | 4.1% | 730 |
| Southwest Airlines | 71% | 0.7% | 15 min | 5.3% | 306 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am97%153 flights
- 9am100%15 flights
- 12pm87%180 flights
- 1pm87%23 flights
- 3pm88%25 flights
- 4pm75%168 flights
- 5pm79%407 flights
- 6pm56%41 flights
- 7pm53%15 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday82%1.3% cancelled
- Tuesday86%1.4% cancelled
- Wednesday77%0.0% cancelled
- Thursday81%0.0% cancelled
- Friday79%0.0% cancelled
- Saturday85%0.0% cancelled
- Sunday82%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.
- Late-arriving aircraft38%
- Air traffic control & airport congestion35%
- Airline (crew, maintenance, cleaning, fueling)24%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather63%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion13%
- Security0%
IAD to PHX: common questions
- How often are IAD to PHX flights on time?
- 82% 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 Washington to Phoenix cancelled?
- 0.8% of scheduled flights were cancelled (8 of 1,036).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 57 min behind schedule on average, and 4.5% of flights were an hour or more late.
- How long is taxi time at IAD?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PHX to IAD — 86% on time
More flights from Washington
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAD → PHX, nonstop flights by US airlines that report to the DOT. How we calculate this.