About 1 in 5 DL 840 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (21%); 1.9% were cancelled. The typical flight landed 14 minutes early.
DL 840: DEN → ATL
Scheduled to leave Denver at 4:43 p.m. local time. Over the past year it arrived on time 79% of the time (317 flights), in line with other DL flights on the route at that hour (79%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Denver to Atlanta (100% of days). Delta Air Lines's last DEN–ATL flight was cancelled 1.6% of the time, against 1.1% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 12:56 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 47 | 83% |
| Tuesday | 46 | 80% |
| Wednesday | 46 | 87% |
| Thursday | 44 | 77% |
| Friday | 45 | 76% |
| Saturday | 44 | 82% |
| Sunday | 45 | 69% |
Why it was late
All flights DEN → ATL · Connecting off DL 840? Check the risk
Questions
How often is DL 840 from DEN to ATL late?
Delta Air Lines 840 from Denver, CO to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 21% of 317 scheduled flights between September 2025 and August 2026. 1.9% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.