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Route on-time record

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

Raleigh/Durham (Raleigh-Durham International Airport) to Dulles (Washington Dulles International Airport). 1,335 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was United 1535 at 10:38 AM.

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

RDU → IAD

Raleigh/Durham to Dulles: 1,335 nonstop flights a year

On time (12 months)

86%

Cancelled

1.4%

avg delay 11 min

Best time to leave

9 AM to noon

94% on time vs 76% 3 to 6 PM

Most reliable airline

United

85% chance on time

Check RDU to IAD fares

Lowest nonstop fare seen in the next two months: $225 (United 1789 on 2026-10-27). 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 1535

    10:38 AM → 11:52 AM1h 14m nonstop

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

    93%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 95% of the time (88 flights, Jun 2025 to May 2026).
    • Never cancelled in 88 scheduled flights.
    • Leaves in this route's most on-time window (9 AM to noon: 94% on time; 3 to 6 PM: 76%).
    • Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).

    Moderate track record · 88 flights

    Find United 1535 fares Opens this date on Aviasales

  2. #2 · United 1789

    6:00 AM → 7:13 AM1h 13m nonstop

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

    92%

    chance on time

    On time (history)
    95%
    Cancelled
    0.9%
    Avg arrival delay
    3 min
    • Arrived on time 95% of the time (107 flights, Jun 2025 to May 2026).
    • Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).

    Moderate track record · 107 flights

    Find United 1789 fares Opens this date on Aviasales

  3. #3 · United 2642

    7:50 PM → 9:04 PM1h 13m nonstop

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

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 83% of the time (66 flights, Jun 2025 to May 2026).
    • Never cancelled in 66 scheduled flights.
    • Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).
    • 86% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 66 flights

    Find United 2642 fares Opens this date on Aviasales

  4. #4 · Republic 3520 · sold as American Eagle, Delta Connection or United Express

    7:45 PM → 9:06 PM1h 21m nonstop

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

    82%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    30 min
    • Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).
    • 99% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find 7:45 PM flight fares Opens this date on Aviasales

  5. #5 · United 2463

    3:02 PM → 4:15 PM1h 13m nonstop

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

    73%

    chance on time

    On time (history)
    74%
    Cancelled
    3.0%
    Avg arrival delay
    21 min
    • Arrived on time 74% of the time (257 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (8 of 265).
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; 9 AM to noon: 94%).
    • Departs inside RDU's trouble window: 57% of its 14 ground stops and delay programs started between 11 AM and 5 PM.

    Strong track record · 257 flights

    Find United 2463 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines85%

    1,065 flights · 87% on time as flown · 1.3% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)84%

    270 flights · 85% on time as flown · 1.7% cancel

On time by departure time

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

  • Before 9 AM90%

    333 flights · avg delay 5 min

  • 9 AM to noon94%

    358 flights · avg delay 5 min

  • Noon to 3 PM92%

    48 flights · avg delay 10 min

  • 3 to 6 PM76%

    320 flights · avg delay 19 min

  • 6 to 9 PM84%

    276 flights · avg delay 16 min

Best day: Saturday (91%). Worst: Monday (84%).

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
87
F
93
M
88
A
89
M
86
J
83
J
82
A
86
S
90
O
90
N
88
D
82

What delays this route

  • Late-arriving aircraft46%
  • Air traffic control and airport volume22%
  • Airline (crew, maintenance, boarding)20%
  • Severe weather12%

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

RDU to IAD questions

What time of day is best to fly RDU to IAD?
9 AM to noon: 94% of flights arrived on time, against 76% for departures 3 to 6 PM.
Which airline is most on time from RDU to IAD?
United, with a season-adjusted 85% chance of operating and arriving on time over 1,065 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 RDU to IAD?
December (82% on time); the best was February (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 RDU

Live status: FAA delays and ground stops