About 1 in 6 DL 499 flights from Boston arrived 15+ minutes late, diverted or cancelled over the past year (18%); 1.4% were cancelled. The typical flight landed 6 minutes early.
DL 499: BOS → DEN
Scheduled to leave Boston at 7:45 a.m. local time. Over the past year it arrived on time 82% of the time (365 flights), in line with other DL flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 85% |
| Tuesday | 52 | 73% |
| Wednesday | 52 | 87% |
| Thursday | 52 | 79% |
| Friday | 52 | 85% |
| Saturday | 52 | 90% |
| Sunday | 52 | 79% |
Why it was late
All flights BOS → DEN · Connecting off DL 499? Check the risk
DL 499: DEN → BOS
Scheduled to leave Denver at 11:33 a.m. local time. Over the past year it arrived on time 70% of the time (349 flights), in line with other DL flights on the route at that hour (71%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 71% |
| Tuesday | 50 | 62% |
| Wednesday | 50 | 70% |
| Thursday | 50 | 70% |
| Friday | 50 | 76% |
| Saturday | 49 | 80% |
| Sunday | 49 | 65% |
Why it was late
All flights DEN → BOS · Connecting off DL 499? Check the risk
Questions
How often is DL 499 from BOS to DEN late?
Delta Air Lines 499 from Boston, MA to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 18% of 365 scheduled flights between September 2025 and August 2026. 1.4% were cancelled.
How often is DL 499 from DEN to BOS late?
Delta Air Lines 499 from Denver, CO to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 30% of 349 scheduled flights between September 2025 and August 2026. 1.1% 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.