77% of flights from Indianapolis to Boston arrived on time over the past 12 months. That is about the typical U.S. route. The 6 a.m. departures ran on time 93% of the time; the 6 p.m. ones 59%. Most reliable airline: Delta Air Lines (79%). 12% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for IND → BOS: when a flight was late, it was under 45 minutes late 43% of the time. About 1 in 11 flights landed an hour or more late, and 1 in 107 three hours or more; 2.8% were cancelled outright.
- On time or early77%
- 15–30 min late5.5%
- 30–60 min late6.0%
- 1–2 hours late5.8%
- 2–3 hours late2.4%
- 3+ hours late0.9%
- Diverted0.0%
- Cancelled2.8%
Share of all 2,025 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| American Airlines | 1,034 | 74% | 3.2% | −8 min | 9.4% | +71 min | Republic Airways 97%, Envoy 3% |
| Delta Air Lines | 973 | 79% | 2.4% | −13 min | 8.8% | +71 min | Republic Airways 100%, Delta Air Lines 0% |
| Allegiant Air | 18 | — | — | — | — | — | Allegiant Air |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at IND). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | American Airlines | Delta Air Lines |
|---|---|---|
| 6 a.m. | — | 93% |
| 7 a.m. | 86% | — |
| 11 a.m. | — | 89% |
| noon | — | 65% |
| 2 p.m. | 64% | — |
| 5 p.m. | — | 61% |
| 6 p.m. | 60% | — |
Last flight of the day
On IND → BOS, each airline's last flight of the day was cancelled 4.3% of the time, against 2.0% for its earlier flights (2.2× as often). It arrived 3+ hours late 1.7% of the time (earlier flights: 0.5%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| American Airlines | 6:35 p.m. | 5.2% | 2.2% | 2.1% | first flight 9:00 a.m. |
| Delta Air Lines | 6:00 p.m. | 3.4% | 1.1% | 1.8% | first flight 6:40 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in BOS tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: November (89%). Worst: September (72%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 319 | 72% | 6.0% |
| Tuesday | 307 | 72% | 4.2% |
| Wednesday | 301 | 79% | 0.7% |
| Thursday | 301 | 78% | 2.0% |
| Friday | 315 | 79% | 0.9% |
| Saturday | 200 | 85% | 1.0% |
| Sunday | 282 | 74% | 3.9% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 27 · air traffic/airport 19 · airline 10
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 5631 | 6:00 a.m. | 365 | 92% | 1.6% | −18 min | Republic Airways |
| AA 4716 | 7:00 a.m. | 335 | 87% | 1.5% | −10 min | Republic Airways |
| AA 4368 | 12:20 p.m. | 202 | 71% | 4.5% | −7 min | Republic Airways |
| AA 4726 | 6:43 p.m. | 265 | 64% | 5.7% | −4 min | Republic Airways |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Nov 10, 2025 | 6 | 0% | 1 |
| Jan 27, 2026 | 6 | 0% | 2 |
| Feb 23, 2026 | 6 | 0% | 6 |
| Jan 25, 2026 | 6 | 0% | 5 |
| Jan 26, 2026 | 6 | 0% | 5 |
Questions
How often are flights from IND to BOS on time?
77% of 2,025 scheduled flights from Indianapolis, IN to Boston, MA arrived within 15 minutes of schedule between September 2025 and August 2026. 2.8% were cancelled.
What is the best time of day to fly IND to BOS?
Flights scheduled to leave at 6 a.m. were the most reliable (93% on time). The 6 p.m. departures were the least (59%).
Which airline is most on time from IND to BOS?
Delta Air Lines: 79% of its 973 flights on the route arrived on time. American Airlines: 74%.
What month has the most delays from IND to BOS?
September (72% on time). The best month is November (89%), over 2023–2026.
Is the last flight of the day from IND to BOS more likely to be cancelled?
Yes. Each airline's last IND–BOS flight of the day was cancelled 4.3% of the time over the past year, against 2.0% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- BOS → IND (return)
- Indianapolis (IND) delays by hour
- Flights into Boston Logan (BOS)
- American Airlines on-time record
- Delta Air Lines on-time record
- Allegiant Air on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.