About 1 in 4 DL 5665 flights from Boston arrived 15+ minutes late, diverted or cancelled over the past year (27%); 3.7% were cancelled. The typical flight landed 11 minutes early.
DL 5665: BOS → RIC
Scheduled to leave Boston at 4:10 p.m. local time, operated by Republic Airways as YX 5665. Over the past year it arrived on time 73% of the time (325 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 | 50 | 70% |
| Tuesday | 50 | 74% |
| Wednesday | 50 | 72% |
| Thursday | 48 | 79% |
| Friday | 46 | 72% |
| Saturday | 40 | 83% |
| Sunday | 41 | 61% |
Why it was late
All flights BOS → RIC · Connecting off DL 5665? Check the risk
DL 5665: RIC → BOS
Scheduled to leave Richmond at 6:59 p.m. local time, operated by Republic Airways as YX 5665. Over the past year it arrived on time 58% of the time (284 flights), better than other DL flights on the route at that hour (54%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Richmond to Boston (100% of days). Delta Air Lines's last RIC–BOS flight was cancelled 4.7% of the time, against 2.1% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 6:04 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 50 | 60% |
| Tuesday | 50 | 58% |
| Wednesday | 50 | 68% |
| Thursday | 48 | 58% |
| Friday | 45 | 56% |
| Saturday | 1 | — |
| Sunday | 40 | 48% |
Why it was late
All flights RIC → BOS · Connecting off DL 5665? Check the risk
Questions
How often is DL 5665 from BOS to RIC late?
Delta Air Lines 5665 from Boston, MA to Richmond, VA arrived 15 or more minutes late, was diverted or was cancelled on 27% of 325 scheduled flights between September 2025 and August 2026. 3.7% were cancelled.
How often is DL 5665 from RIC to BOS late?
Delta Air Lines 5665 from Richmond, VA to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 42% of 284 scheduled flights between September 2025 and August 2026. 5.3% 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.