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Route on-time record

IAD to ATL: most on-time flights and the best time to fly

Dulles (Washington Dulles International Airport) to Atlanta (Hartsfield Jackson Atlanta International Airport). 3,946 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 2.2% were cancelled. The most reliable flight number was United 2739 at 8:29 AM.

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

IAD → ATL

Dulles to Atlanta: 3,946 nonstop flights a year

On time (12 months)

78%

Cancelled

2.2%

avg delay 20 min

Best time to leave

9 AM to noon

85% on time vs 70% 3 to 6 PM

Most reliable airline

United

80% chance on time

Check IAD to ATL fares

Lowest nonstop fare seen in the next two months: $22 (Frontier 4707 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. #1 · United 2739

    8:29 AM → 10:29 AM2h 00m nonstop

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

    89%

    chance on time

    On time (history)
    90%
    Cancelled
    0.4%
    Avg arrival delay
    9 min
    • Arrived on time 90% of the time (240 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).

    Strong track record · 240 flights

    Find United 2739 fares Opens this date on Aviasales

  2. #2 · United 471

    12:40 PM → 2:41 PM2h 01m nonstop

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

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    0.4%
    Avg arrival delay
    11 min
    • Arrived on time 87% of the time (245 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).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 245 flights

    Find United 471 fares Opens this date on Aviasales

  3. #3 · Delta 2127

    6:01 AM → 7:58 AM1h 54m nonstop

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

    84%

    chance on time

    On time (history)
    89%
    Cancelled
    2.4%
    Avg arrival delay
    13 min
    • Arrived on time 89% of the time (202 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).

    Strong track record · 202 flights

    Find Delta 2127 fares Opens this date on Aviasales

  4. #4 · Delta 1444

    12:47 PM → 2:42 PM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    81%

    chance on time

    On time (history)
    85%
    Cancelled
    4.1%
    Avg arrival delay
    11 min
    • Arrived on time 85% of the time (162 flights, Jun 2025 to May 2026).
    • Cancelled 4.1% of the time (7 of 170).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Moderate track record · 162 flights

    Find Delta 1444 fares Opens this date on Aviasales

  5. #5 · Delta 1324

    10:11 AM → 12:01 PM1h 55m nonstop

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

    81%

    chance on time

    On time (history)
    86%
    Cancelled
    5.4%
    Avg arrival delay
    19 min
    • Arrived on time 86% of the time (139 flights, Jun 2025 to May 2026).
    • Cancelled 5.4% of the time (8 of 147).
    • Leaves in this route's most on-time window (9 AM to noon: 85% on time; 3 to 6 PM: 70%).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).

    Moderate track record · 139 flights

    Find Delta 1324 fares Opens this date on Aviasales

  6. #6 · Delta 2135

    3:00 PM → 4:45 PM1h 51m nonstop

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

    80%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 85% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 70% on time; 9 AM to noon: 85%).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Limited track record · 53 flights

    Find Delta 2135 fares Opens this date on Aviasales

  7. #7 · Delta 2902

    7:29 PM → 9:38 PM2h 05m nonstop

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

    79%

    chance on time

    On time (history)
    85%
    Cancelled
    5.6%
    Avg arrival delay
    14 min
    • Arrived on time 85% of the time (102 flights, Jun 2025 to May 2026).
    • Cancelled 5.6% of the time (6 of 108).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 102 flights

    Find Delta 2902 fares Opens this date on Aviasales

  8. #8 · Delta 1354

    7:18 AM → 9:22 AM2h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-26.

    79%

    chance on time

    On time (history)
    81%
    Cancelled
    2.4%
    Avg arrival delay
    20 min
    • Arrived on time 81% of the time (319 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).

    Strong track record · 319 flights

    Find Delta 1354 fares Opens this date on Aviasales

  9. #9 · United 1635

    10:08 PM → 11:59 PM1h 51m nonstop

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

    76%

    chance on time

    On time (history)
    77%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 77% of the time (52 flights, Jun 2025 to May 2026).
    • Never cancelled in 52 scheduled flights.
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 52 flights

    Find United 1635 fares Opens this date on Aviasales

  10. #10 · Frontier 4707

    6:20 AM → 8:36 AM2h 10m nonstop

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

    70%

    chance on time

    On time (history)
    71%
    Cancelled
    1.8%
    Avg arrival delay
    26 min
    • Arrived on time 71% of the time (327 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).

    Strong track record · 327 flights

    Find Frontier 4707 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines80%

    1,084 flights · 81% on time as flown · 0.6% cancel

  • Delta Air Lines78%

    2,217 flights · 80% on time as flown · 3.0% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)77%

    38 flights · 75% on time as flown · 2.8% cancel

  • Frontier Airlines67%

    607 flights · 68% on time as flown · 2.0% cancel

On time by departure time

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

  • Before 9 AM83%

    1,273 flights · avg delay 17 min

  • 9 AM to noon85%

    435 flights · avg delay 12 min

  • Noon to 3 PM82%

    767 flights · avg delay 14 min

  • 3 to 6 PM70%

    1,054 flights · avg delay 28 min

  • 6 to 9 PM72%

    304 flights · avg delay 28 min

Best day: Saturday (83%). Worst: Sunday (76%).

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
79
F
86
M
81
A
85
M
74
J
73
J
70
A
79
S
86
O
87
N
88
D
80

What delays this route

  • Late-arriving aircraft41%
  • Airline (crew, maintenance, boarding)35%
  • Air traffic control and airport volume21%
  • Severe weather4%

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 ATL questions

What time of day is best to fly IAD to ATL?
9 AM to noon: 85% of flights arrived on time, against 70% for departures 3 to 6 PM.
Which airline is most on time from IAD to ATL?
United, with a season-adjusted 80% chance of operating and arriving on time over 1,084 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 ATL?
July (70% on time); the best was November (88%), 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

Live status: FAA delays and ground stops