About 1 in 13 DL 5631 flights from Indianapolis arrived 15+ minutes late, diverted or cancelled over the past year (8%); 1.6% were cancelled. The typical flight landed 18 minutes early.
DL 5631: IND → BOS
Scheduled to leave Indianapolis at 6:00 a.m. local time, operated by Republic Airways as YX 5631. Over the past year it arrived on time 92% of the time (365 flights), in line with other DL flights on the route at that hour (93%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 79% |
| Tuesday | 52 | 88% |
| Wednesday | 52 | 98% |
| Thursday | 52 | 98% |
| Friday | 52 | 87% |
| Saturday | 52 | 96% |
| Sunday | 52 | 98% |
Why it was late
All flights IND → BOS · Connecting off DL 5631? Check the risk
Questions
How often is DL 5631 from IND to BOS late?
Delta Air Lines 5631 from Indianapolis, IN to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 8% of 365 scheduled flights between September 2025 and August 2026. 1.6% 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.