Route on-time record
IAD to FLL: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Fort Lauderdale (Fort Lauderdale Hollywood International Airport). 742 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was United 1825 at 8:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
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
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 · 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 · 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 · 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 · 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 · 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%).
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.
What delays this route
- Late-arriving aircraft35%
- Air traffic control and airport volume34%
- Airline (crew, maintenance, boarding)22%
- Severe weather10%
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
IAD to FLL questions
- What time of day is best to fly IAD to FLL?
- Before 9 AM: 90% of flights arrived on time, against 76% 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 IAD to FLL?
- United, with a season-adjusted 83% chance of operating and arriving on time over 731 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 FLL?
- July (70% on time); the best was November (91%), 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
- FLL to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- IAD to LAX 80%
- IAD to MCO 81%
- IAD to CLT 83%
- IAD to ORD 75%
- IAD to SEA 76%
- IAD to DFW 77%
- IAD to IAH 83%
- IAD to BOS 75%
- IAD to EWR 73%
Live status: FAA delays and ground stops