Route on-time record
ATL to IAD: most on-time flights and the best time to fly
Atlanta (Hartsfield Jackson Atlanta International Airport) to Dulles (Washington Dulles International Airport). 3,949 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 2.2% were cancelled. The most reliable flight number was United 641 at 5:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ATL → IAD
Atlanta to Dulles: 3,949 nonstop flights a year
On time (12 months)
75%
Cancelled
2.2%
avg delay 21 min
Best time to leave
Before 9 AM
87% on time vs 63% after 9 PM
Most reliable airline
Republic
81% chance on time
Lowest nonstop fare seen in the next two months: $23 (Frontier 4410 on 2026-11-17). 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 641
5:30 AM → 7:32 AM1h 47m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 95% of the time (43 flights, Jun 2025 to May 2026).
- Never cancelled in 43 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 63%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Limited track record · 43 flights
Find United 641 fares Opens this date on Aviasales#2 · United 632
9:52 AM → 11:46 AM1h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.9%
- Avg arrival delay
- 9 min
- Arrived on time 86% of the time (326 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 326 flights
Find United 632 fares Opens this date on Aviasales#3 · Delta 1444
10:05 AM → 11:52 AM1h 47m nonstop
Local times, typical schedule. Last flown 2026-05-30.
83%
chance on time
- On time (history)
- 89%
- Cancelled
- 4.7%
- Avg arrival delay
- 10 min
- Arrived on time 89% of the time (162 flights, Jun 2025 to May 2026).
- Cancelled 4.7% of the time (8 of 170).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Moderate track record · 162 flights
Find Delta 1444 fares Opens this date on Aviasales#4 · Delta 2135
12:23 PM → 2:04 PM1h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 90% of the time (52 flights, Jun 2025 to May 2026).
- Never cancelled in 53 scheduled flights.
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 52 flights
Find Delta 2135 fares Opens this date on Aviasales#5 · Delta 1324
7:30 AM → 9:10 AM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 87%
- Cancelled
- 4.6%
- Avg arrival delay
- 8 min
- Arrived on time 87% of the time (104 flights, Jun 2025 to May 2026).
- Cancelled 4.6% of the time (5 of 109).
- Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 63%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Moderate track record · 104 flights
Find Delta 1324 fares Opens this date on Aviasales#6 · United 2634
7:31 PM → 9:24 PM1h 53m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.3%
- Avg arrival delay
- 20 min
- Arrived on time 76% of the time (311 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 311 flights
Find United 2634 fares Opens this date on Aviasales#7 · United 1831
2:37 PM → 4:30 PM1h 53m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.6%
- Avg arrival delay
- 26 min
- Arrived on time 76% of the time (356 flights, Jun 2025 to May 2026).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 356 flights
Find United 1831 fares Opens this date on Aviasales#8 · Delta 1695
12:59 PM → 2:39 PM1h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 74%
- Cancelled
- 2.5%
- Avg arrival delay
- 19 min
- Arrived on time 74% of the time (349 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 349 flights
Find Delta 1695 fares Opens this date on Aviasales#9 · Delta 1309
7:07 PM → 8:46 PM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
71%
chance on time
- On time (history)
- 73%
- Cancelled
- 2.7%
- Avg arrival delay
- 18 min
- Arrived on time 73% of the time (255 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 255 flights
Find Delta 1309 fares Opens this date on Aviasales#10 · Delta 2549
10:46 PM → 12:27 AM1h 44m nonstop
Local times, typical schedule. Last flown 2026-05-31.
69%
chance on time
- On time (history)
- 73%
- Cancelled
- 3.6%
- Avg arrival delay
- 29 min
- Arrived on time 73% of the time (317 flights, Jun 2025 to May 2026).
- Cancelled 3.6% of the time (12 of 329).
- Leaves in this route's least on-time window (After 9 PM: 63% on time; Before 9 AM: 87%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 317 flights
Find Delta 2549 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Republic Airways (sold as American Eagle, Delta Connection or United Express)81%
39 flights · 92% on time as flown · 2.3% cancel
- United Airlines79%
1,085 flights · 80% on time as flown · 0.8% cancel
- Delta Air Lines74%
2,217 flights · 77% on time as flown · 2.9% cancel
- Frontier Airlines61%
608 flights · 61% on time as flown · 2.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM87%
468 flights · avg delay 11 min
- 9 AM to noon83%
748 flights · avg delay 12 min
- Noon to 3 PM77%
1,018 flights · avg delay 22 min
- 3 to 6 PM67%
461 flights · avg delay 28 min
- 6 to 9 PM74%
644 flights · avg delay 20 min
- After 9 PM63%
610 flights · avg delay 37 min
Best day: Wednesday (83%). Worst: Sunday (75%).
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
- Airline (crew, maintenance, boarding)40%
- Late-arriving aircraft35%
- Air traffic control and airport volume19%
- Severe weather6%
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
ATL to IAD questions
- What time of day is best to fly ATL to IAD?
- Before 9 AM: 87% of flights arrived on time, against 63% for departures after 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 ATL to IAD?
- Republic, with a season-adjusted 81% chance of operating and arriving on time over 39 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 ATL to IAD?
- July (67% on time); the best was October (87%), 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 ATL
- IAD to ATL (return)
- ATL to LGA 73%
- ATL to MCO 69%
- ATL to FLL 69%
- ATL to DCA 69%
- ATL to DFW 73%
- ATL to ORD 71%
- ATL to EWR 72%
- ATL to MIA 70%
- ATL to TPA 71%
- ATL to PHL 73%
- ATL to DEN 76%
- ATL to BWI 74%
Live status: FAA delays and ground stops