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Route on-time record

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

Raleigh/Durham (Raleigh-Durham International Airport) to Austin (Austin Bergstrom International Airport). 512 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was Southwest 3978 at 6:10 AM.

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

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RDU → AUS

Raleigh/Durham to Austin: 512 nonstop flights a year

On time (12 months)

80%

Cancelled

0.6%

avg delay 12 min

Best time to leave

Before 9 AM

92% on time vs 74% 3 to 6 PM

Most reliable airline

Southwest

80% chance on time

Check RDU to AUS fares

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 · Southwest 3978

    6:10 AM → 8:20 AM3h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    85%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 82% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 74%).
    • Departs outside RDU's trouble window (11 AM to 5 PM, when 57% of its 14 ground stops and delay programs started).

    Limited track record · 39 flights

    Find Southwest 3978 fares Opens this date on Aviasales

  2. #2 · Southwest 3979

    4:50 PM → 7:00 PM3h 10m nonstop

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

    67%

    chance on time

    On time (history)
    54%
    Cancelled
    0.0%
    Avg arrival delay
    21 min
    • Arrived on time 54% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 74% on time; Before 9 AM: 92%).
    • Departs inside RDU's trouble window: 57% of its 14 ground stops and delay programs started between 11 AM and 5 PM.

    Limited track record · 39 flights

    Find Southwest 3979 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines80%

    512 flights · 80% on time as flown · 0.6% cancel

On time by departure time

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

  • Before 9 AM92%

    148 flights · avg delay 5 min

  • 9 AM to noon78%

    36 flights · avg delay 19 min

  • Noon to 3 PM86%

    72 flights · avg delay 7 min

  • 3 to 6 PM74%

    231 flights · avg delay 13 min

Best day: Tuesday (84%). Worst: Sunday (73%).

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
80
F
86
M
82
A
80
M
61
J
72
J
69
A
82
S
84
O
86
N
75
D
83

What delays this route

  • Late-arriving aircraft43%
  • Airline (crew, maintenance, boarding)29%
  • Air traffic control and airport volume23%
  • Severe weather3%
  • 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

Finding the most reliable connections from RDU to AUS…

RDU to AUS questions

What time of day is best to fly RDU to AUS?
Before 9 AM: 92% of flights arrived on time, against 74% for departures 3 to 6 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 AUS?
Southwest, with a season-adjusted 80% chance of operating and arriving on time over 512 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 AUS?
May (61% on time); the best was February (86%), 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.

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Live status: FAA delays and ground stops