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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

IAD → FLL

Dulles to Fort Lauderdale: 742 nonstop flights a year

On time (12 months)

83%

Cancelled

0.5%

avg delay 13 min

Best time to leave

Before 9 AM

90% on time vs 76% 3 to 6 PM

Most reliable airline

United

83% chance on time

Check IAD to FLL fares

Lowest nonstop fare seen in the next two months: $45 (Frontier 2959 on 2026-11-08). 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 1825

    8:15 AM → 11:07 AM2h 49m nonstop

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

    89%

    chance on time

    On time (history)
    90%
    Cancelled
    0.4%
    Avg arrival delay
    6 min
    • Arrived on time 90% of the time (259 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 76%).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).

    Strong track record · 259 flights

    Find United 1825 fares Opens this date on Aviasales

  2. #2 · United 2639

    1:20 PM → 4:09 PM2h 49m nonstop

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

    84%

    chance on time

    On time (history)
    86%
    Cancelled
    1.6%
    Avg arrival delay
    10 min
    • Arrived on time 86% of the time (121 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 FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 121 flights

    Find United 2639 fares Opens this date on Aviasales

  3. #3 · United 2304

    6:45 PM → 9:38 PM2h 53m nonstop

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

    81%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 86% 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.
    • Short track record (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find United 2304 fares Opens this date on Aviasales

  4. #4 · United 1379

    5:42 PM → 8:35 PM2h 53m nonstop

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

    78%

    chance on time

    On time (history)
    78%
    Cancelled
    0.4%
    Avg arrival delay
    19 min
    • Arrived on time 78% of the time (252 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; Before 9 AM: 90%).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 252 flights

    Find United 1379 fares Opens this date on Aviasales

  5. #5 · Frontier 2959

    5:30 PM → 8:20 PM2h 50m nonstop

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

    71%

    chance on time

    On time (history)
    45%
    Cancelled
    0.0%
    Avg arrival delay
    31 min
    • Arrived on time 45% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; Before 9 AM: 90%).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find Frontier 2959 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines83%

    731 flights · 84% on time as flown · 0.5% cancel

On time by departure time

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

  • Before 9 AM90%

    261 flights · avg delay 6 min

  • Noon to 3 PM82%

    142 flights · avg delay 12 min

  • 3 to 6 PM76%

    197 flights · avg delay 20 min

  • 6 to 9 PM82%

    141 flights · avg delay 16 min

Best day: Tuesday (85%). Worst: Sunday (78%).

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