Route on-time record
IAD to MSY: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to New Orleans (Louis Armstrong New Orleans International Airport). 649 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was United 2253 at 9:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → MSY
Dulles to New Orleans: 649 nonstop flights a year
On time (12 months)
85%
Cancelled
0.5%
avg delay 13 min
Best time to leave
9 AM to noon
97% on time vs 81% 3 to 6 PM
Most reliable airline
United
84% chance on time
Lowest nonstop fare seen in the next two months: $321 (United 251 on 2026-10-25). 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 2253
9:00 AM → 10:51 AM2h 51m nonstop
Local times, typical schedule. Last flown 2026-05-29.
89%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.9%
- Avg arrival delay
- 7 min
- Arrived on time 90% of the time (220 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 97% on time; 3 to 6 PM: 81%).
- 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 · 220 flights
Find United 2253 fares Opens this date on Aviasales#2 · United 2603
1:05 PM → 2:56 PM2h 51m nonstop
Local times, typical schedule. Last flown 2026-05-20.
86%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 90% of the time (20 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 (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find United 2603 fares Opens this date on Aviasales#3 · United 2042
8:02 PM → 9:49 PM2h 47m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 2042 fares Opens this date on Aviasales#4 · United 251
5:50 PM → 7:44 PM2h 54m nonstop
Local times, typical schedule. Last flown 2026-05-20.
80%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.3%
- Avg arrival delay
- 17 min
- Arrived on time 81% of the time (345 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 81% on time; 9 AM to noon: 97%).
- 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 · 345 flights
Find United 251 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines84%
631 flights · 85% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM89%
197 flights · avg delay 7 min
- 9 AM to noon97%
63 flights · avg delay 2 min
- 3 to 6 PM81%
342 flights · avg delay 17 min
Best day: Saturday (87%). Worst: Sunday (80%).
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 aircraft49%
- Airline (crew, maintenance, boarding)22%
- Air traffic control and airport volume21%
- Severe weather7%
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 MSY questions
- What time of day is best to fly IAD to MSY?
- 9 AM to noon: 97% of flights arrived on time, against 81% for departures 3 to 6 PM.
- Which airline is most on time from IAD to MSY?
- United, with a season-adjusted 84% chance of operating and arriving on time over 631 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 MSY?
- July (67% on time); the best was September (92%), 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
- MSY 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