Route on-time record
PHX to IAD: most on-time flights and the best time to fly
Phoenix (Phoenix Sky Harbor International Airport) to Dulles (Washington Dulles International Airport). 1,155 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 1873 at 7:35 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PHX → IAD
Phoenix to Dulles: 1,155 nonstop flights a year
On time (12 months)
84%
Cancelled
0.6%
avg delay 10 min
Best time to leave
3 to 6 PM
91% on time vs 80% 9 AM to noon
Most reliable airline
United
88% chance on time
Lowest nonstop fare seen in the next two months: $189 (United 1017 on 2026-11-18). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 1873
7:35 AM → 3:01 PM4h 26m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.3%
- Avg arrival delay
- 6 min
- Arrived on time 93% of the time (284 flights, Jun 2025 to May 2026).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 45% of its 47 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 284 flights
Find United 1873 fares Opens this date on Aviasales#2 · United 483
11:47 PM → 7:06 AM4h 15m nonstop
Local times, typical schedule. Last flown 2026-05-20.
91%
chance on time
- On time (history)
- 91%
- Cancelled
- 2.4%
- Avg arrival delay
- 9 min
- Arrived on time 91% of the time (161 flights, Jun 2025 to May 2026).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 45% of its 47 ground stops and delay programs started).
Moderate track record · 161 flights
Find United 483 fares Opens this date on Aviasales#3 · United 1017
1:23 PM → 8:47 PM4h 24m nonstop
Local times, typical schedule. Last flown 2026-05-18.
89%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.4%
- Avg arrival delay
- 8 min
- Arrived on time 91% of the time (226 flights, Jun 2025 to May 2026).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 45% of its 47 ground stops and delay programs started).
Strong track record · 226 flights
Find United 1017 fares Opens this date on Aviasales#4 · Southwest 3800
9:45 AM → 5:05 PM4h 20m nonstop
Local times, typical schedule. Last flown 2026-05-29.
74%
chance on time
- On time (history)
- 70%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 70% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (9 AM to noon: 80% on time; 3 to 6 PM: 91%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 45% of its 47 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 23 flights
Find Southwest 3800 fares Opens this date on Aviasales#5 · Southwest 2007
10:10 AM → 5:25 PM4h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
70%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (9 AM to noon: 80% on time; 3 to 6 PM: 91%).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 45% of its 47 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 8 flights
Find Southwest 2007 fares Opens this date on Aviasales#6 · Southwest 1016
8:35 AM → 3:50 PM4h 15m nonstop
Local times, typical schedule. Last flown 2026-05-30.
69%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 63% of the time (24 flights, Jun 2025 to May 2026).
- Departs outside PHX's trouble window (2 PM to 8 PM, when 45% of its 47 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 24 flights
Find Southwest 1016 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines88%
791 flights · 89% on time as flown · 0.7% cancel
- Southwest Airlines76%
364 flights · 75% on time as flown · 0.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
384 flights · avg delay 10 min
- 9 AM to noon80%
315 flights · avg delay 9 min
- Noon to 3 PM84%
168 flights · avg delay 12 min
- 3 to 6 PM91%
119 flights · avg delay 8 min
- After 9 PM90%
169 flights · avg delay 9 min
Best day: Saturday (88%). Worst: Sunday (80%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)51%
- Late-arriving aircraft24%
- Air traffic control and airport volume21%
- Security3%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
PHX to IAD questions
- What time of day is best to fly PHX to IAD?
- 3 to 6 PM: 91% of flights arrived on time, against 80% for departures 9 AM to noon.
- Which airline is most on time from PHX to IAD?
- United, with a season-adjusted 88% chance of operating and arriving on time over 791 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on PHX to IAD?
- July (72% on time); the best was January (93%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from PHX
- IAD to PHX (return)
- PHX to DEN 77%
- PHX to LAX 83%
- PHX to SEA 83%
- PHX to LAS 79%
- PHX to SAN 74%
- PHX to SLC 83%
- PHX to ORD 77%
- PHX to DFW 80%
- PHX to SFO 71%
- PHX to SNA 80%
- PHX to ATL 82%
- PHX to PDX 79%
Most on-time flights from PHX on every route →
Live status: FAA delays and ground stops