Washington (IAD) to Atlanta (ATL): On-Time Performance
Data through July 2026
The calendar drives reliability on IAD–ATL. November 2024 flights landed on schedule 93% of the time, but July 2026 dropped to 62% — a gap of 31 points. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (84% vs 69%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.9%
- Flights/day
- 11
- last 12 months
- Duration
- 1h 58m
- scheduled
- Distance
- 534 mi
Best airline from IAD to ATL
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 80% | 16 min | 0.8% | 2,432 |
| Delta Air Lines | 80% | 19 min | 2.3% | 4,577 |
| Frontier Airlines | 64% | 32 min | 3.1% | 961 |
Monthly on-time trend
Best time to fly from IAD to ATL
Aim for departures around 8 a.m. (88% on-time); avoid 8 p.m. departures (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 22 min |
| Tuesdaybest | 81% | 14 min |
| Wednesday | 79% | 19 min |
| Thursday | 81% | 16 min |
| Friday | 75% | 25 min |
| Saturday | 80% | 20 min |
| Sunday | 74% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations36%
- National airspace system20%
- Weather4%
Frequently asked questions
- How often are flights from IAD to ATL delayed?
- 22% of IAD–ATL 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 IAD to ATL?
- United Airlines has the best on-time record on this route at 80%, based on 2,432 flights. 3 airlines flew IAD–ATL frequently enough to compare in this period.
- What is the best time of day to fly from IAD to ATL?
- Departures around 8 a.m. have the best record (88% on-time), while departures around 8 p.m. have the worst (53%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to ATL?
- The scheduled IAD–ATL flight time averages 1h 58m over 534 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are IAD to ATL 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 IAD to ATL?
- July 2026 was the roughest month in this dataset, with only 62% of arrivals on time. The best was November 2024 at 93%. If your dates are flexible, that 31-point gap is worth planning around.
Explore related pages
More routes from IAD
Other ways to fly to Atlanta (ATL)
Related guides
Based on 8,026 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.