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Route on-time record

IAD to PHX: most on-time flights and the best time to fly

Dulles (Washington Dulles International Airport) to Phoenix (Phoenix Sky Harbor International Airport). 1,154 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 709 at 8:50 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

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IAD → PHX

Dulles to Phoenix: 1,154 nonstop flights a year

On time (12 months)

80%

Cancelled

0.8%

avg delay 15 min

Best time to leave

Before 9 AM

94% on time vs 54% 6 to 9 PM

Most reliable airline

United

84% chance on time

Check IAD to PHX fares

Lowest nonstop fare seen in the next two months: $169 (United 1637 on 2026-11-20). 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. #1 · United 709

    8:50 AM → 10:59 AM5h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-18.

    95%

    chance on time

    On time (history)
    99%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 99% of the time (71 flights, Jun 2025 to May 2026).
    • Never cancelled in 71 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 54%).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).

    Moderate track record · 71 flights

    Find United 709 fares Opens this date on Aviasales

  2. #2 · United 1184

    1:05 PM → 3:15 PM5h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    85%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 90% of the time (21 flights, Jun 2025 to May 2026).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside PHX's trouble window: 45% of its 47 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 21 flights

    Find United 1184 fares Opens this date on Aviasales

  3. #3 · United 1938

    5:37 PM → 7:49 PM5h 16m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    77%

    chance on time

    On time (history)
    77%
    Cancelled
    0.6%
    Avg arrival delay
    20 min
    • Arrived on time 77% of the time (333 flights, Jun 2025 to May 2026).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside PHX's trouble window: 45% of its 47 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 333 flights

    Find United 1938 fares Opens this date on Aviasales

  4. #4 · Southwest 2836

    4:30 PM → 6:35 PM5h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    68%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 75% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside PHX's trouble window: 45% of its 47 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 55 flights

    Find Southwest 2836 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines84%

    790 flights · 85% on time as flown · 0.8% cancel

  • Southwest Airlines70%

    364 flights · 69% on time as flown · 0.8% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM94%

    223 flights · avg delay 5 min

  • Noon to 3 PM86%

    212 flights · avg delay 9 min

  • 3 to 6 PM75%

    636 flights · avg delay 19 min

  • 6 to 9 PM54%

    68 flights · avg delay 26 min

Best day: Tuesday (85%). Worst: Friday (79%).

Smarter routing

Nearby airports that run more on time

  • DCA → PHX 81% chance on time

    Ronald Reagan Washington National Airport to Phoenix Sky Harbor International Airport · 1,088 flights a year · 23 mi from your airports · yours: 79%

    Rank flightsFares

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.

J
81
F
87
M
88
A
84
M
82
J
69
J
60
A
79
S
81
O
85
N
85
D
87

What delays this route

  • Late-arriving aircraft44%
  • Air traffic control and airport volume26%
  • Airline (crew, maintenance, boarding)25%
  • Severe weather5%

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

Finding the most reliable connections from IAD to PHX…

IAD to PHX questions

What time of day is best to fly IAD to PHX?
Before 9 AM: 94% of flights arrived on time, against 54% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from IAD to PHX?
United, with a season-adjusted 84% chance of operating and arriving on time over 790 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 IAD to PHX?
July (60% on time); the best was March (88%), 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 IAD

Most on-time flights from IAD on every route →

Live status: FAA delays and ground stops