Atlanta (ATL) to Washington (IAD): On-Time Performance
Data through July 2026
The calendar drives reliability on ATL–IAD. November 2024 flights landed on schedule 90% of the time, but July 2025 dropped to 61% — a gap of 30 points. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 70%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.9%
- Flights/day
- 11
- last 12 months
- Duration
- 1h 46m
- scheduled
- Distance
- 534 mi
Best airline from ATL to IAD
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 82% | 17 min | 1.0% | 2,418 |
| Delta Air Lines | 77% | 19 min | 2.1% | 4,577 |
| Frontier Airlines | 60% | 34 min | 2.9% | 963 |
Monthly on-time trend
Best time to fly from ATL to IAD
Aim for departures around 5 a.m. (95% on-time); avoid 9 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 20 min |
| Tuesday | 80% | 19 min |
| Wednesdaybest | 80% | 18 min |
| Thursday | 78% | 18 min |
| Friday | 72% | 22 min |
| Saturday | 79% | 19 min |
| Sunday | 72% | 21 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft34%
- Airline operations42%
- National airspace system18%
- Weather6%
Frequently asked questions
- How often are flights from ATL to IAD delayed?
- 24% of ATL–IAD flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 20 minutes.
- Which airline is most reliable from ATL to IAD?
- United Airlines has the best on-time record on this route at 82%, based on 2,418 flights. 3 airlines flew ATL–IAD frequently enough to compare in this period.
- What is the best time of day to fly from ATL to IAD?
- Departures around 5 a.m. have the best record (95% on-time), while departures around 9 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to IAD?
- The scheduled ATL–IAD flight time averages 1h 46m over 534 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are ATL to IAD flights cancelled?
- 1.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from ATL to IAD?
- July 2025 was the roughest month in this dataset, with only 61% of arrivals on time. The best was November 2024 at 90%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 8,014 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.