About 1 in 3 UA 597 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (33%); 1.2% were cancelled. The typical flight landed 6 minutes early.
UA 597: DEN → BOS
Scheduled to leave Denver at 2:10 p.m. local time. Over the past year it arrived on time 67% of the time (339 flights), better than other UA flights on the route at that hour (64%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 49 | 51% |
| Tuesday | 48 | 75% |
| Wednesday | 48 | 75% |
| Thursday | 48 | 69% |
| Friday | 48 | 67% |
| Saturday | 49 | 76% |
| Sunday | 49 | 59% |
Why it was late
All flights DEN → BOS · Connecting off UA 597? Check the risk
UA 597: PHX → DEN
Scheduled to leave Phoenix at 9:08 a.m. local time. Over the past year it arrived on time 86% of the time (262 flights), in line with other UA flights on the route at that hour (88%). Last seen in the data Aug 10, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 39 | 92% |
| Tuesday | 37 | 81% |
| Wednesday | 37 | 81% |
| Thursday | 37 | 81% |
| Friday | 37 | 92% |
| Saturday | 37 | 86% |
| Sunday | 38 | 84% |
Why it was late
All flights PHX → DEN · Connecting off UA 597? Check the risk
Questions
How often is UA 597 from DEN to BOS late?
United Airlines 597 from Denver, CO to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 33% of 339 scheduled flights between September 2025 and August 2026. 1.2% were cancelled.
How often is UA 597 from PHX to DEN late?
United Airlines 597 from Phoenix, AZ to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 15% of 262 scheduled flights between September 2025 and August 2026. 0.4% 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 United Airlines for today's flight. Method.