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Route on-time record

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

Raleigh/Durham (Raleigh-Durham International Airport) to Houston (George Bush Intercontinental Airport). 910 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was United 1383 at 6:30 AM.

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

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RDU → IAH

Raleigh/Durham to Houston: 910 nonstop flights a year

On time (12 months)

82%

Cancelled

1.4%

avg delay 17 min

Best time to leave

Before 9 AM

93% on time vs 62% 6 to 9 PM

Most reliable airline

United

84% chance on time

Check RDU to IAH fares

Lowest nonstop fare seen in the next two months: $158 (Frontier 1741 on 2026-10-30). 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 1383

    6:30 AM → 8:38 AM3h 08m nonstop

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

    92%

    chance on time

    On time (history)
    93%
    Cancelled
    1.5%
    Avg arrival delay
    7 min
    • Arrived on time 93% of the time (335 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 62%).
    • Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).

    Strong track record · 335 flights

    Find United 1383 fares Opens this date on Aviasales

  2. #2 · United 2407

    4:45 PM → 6:58 PM3h 13m nonstop

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

    78%

    chance on time

    On time (history)
    77%
    Cancelled
    0.3%
    Avg arrival delay
    18 min
    • Arrived on time 77% of the time (323 flights, Jun 2025 to May 2026).
    • 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 · 323 flights

    Find United 2407 fares Opens this date on Aviasales

  3. #3 · Frontier 1741

    10:16 AM → 12:34 PM3h 18m nonstop

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

    73%

    chance on time

    On time (history)
    79%
    Cancelled
    1.2%
    Avg arrival delay
    16 min
    • Arrived on time 79% of the time (81 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).
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
    • 69% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 81 flights

    Find Frontier 1741 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines84%

    719 flights · 86% on time as flown · 1.1% cancel

  • Frontier Airlines70%

    184 flights · 70% on time as flown · 2.4% cancel

On time by departure time

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

  • Before 9 AM93%

    367 flights · avg delay 7 min

  • 9 AM to noon81%

    76 flights · avg delay 14 min

  • Noon to 3 PM87%

    31 flights · avg delay 25 min

  • 3 to 6 PM76%

    343 flights · avg delay 20 min

  • 6 to 9 PM62%

    93 flights · avg delay 48 min

Best day: Tuesday (85%). Worst: Thursday (77%).

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
84
F
88
M
87
A
88
M
75
J
70
J
68
A
79
S
84
O
85
N
81
D
82

What delays this route

  • Late-arriving aircraft40%
  • Air traffic control and airport volume32%
  • Airline (crew, maintenance, boarding)24%
  • Severe weather4%

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 RDU to IAH…

RDU to IAH questions

What time of day is best to fly RDU to IAH?
Before 9 AM: 93% of flights arrived on time, against 62% 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 RDU to IAH?
United, with a season-adjusted 84% chance of operating and arriving on time over 719 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 IAH?
July (68% on time); the best was February (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 RDU

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Live status: FAA delays and ground stops