73% of flights from Boston to Philadelphia arrived on time over the past 12 months. That is worse than the typical U.S. route. The 6 a.m. departures ran on time 92% of the time; the 6 p.m. ones 50%. Most reliable airline: American Airlines (75%). 14% 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 BOS → PHL: when a flight was late, it was under 45 minutes late 45% of the time. About 1 in 10 flights landed an hour or more late, and 1 in 42 three hours or more; 3.5% were cancelled outright.
- On time or early73%
- 15–30 min late6.6%
- 30–60 min late6.0%
- 1–2 hours late6.0%
- 2–3 hours late2.1%
- 3+ hours late2.4%
- Diverted0.1%
- Cancelled3.5%
Share of all 5,036 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 | 2,844 | 75% | 3.1% | −8 min | 10.1% | +105 min | American Airlines 80%, Republic Airways 20% |
| Delta Air Lines | 1,268 | 74% | 4.2% | −9 min | 9.7% | +72 min | Republic Airways |
| JetBlue | 892 | 68% | 3.6% | −7 min | 13.0% | +70 min | JetBlue |
| Frontier Airlines | 32 | — | — | — | — | — | Frontier Airlines |
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 BOS). 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 | JetBlue |
|---|---|---|---|
| 5 a.m. | 88% | — | — |
| 6 a.m. | 91% | — | 93% |
| 7 a.m. | 92% | 90% | 84% |
| 8 a.m. | 85% | — | — |
| 9 a.m. | 88% | — | — |
| 10 a.m. | 79% | — | — |
| 11 a.m. | 77% | 84% | — |
| noon | 75% | — | — |
| 1 p.m. | 69% | — | — |
| 3 p.m. | 67% | 69% | — |
| 4 p.m. | 61% | — | — |
| 5 p.m. | 61% | 59% | — |
| 6 p.m. | 58% | — | — |
| 7 p.m. | 47% | 60% | — |
| 8 p.m. | — | 59% | — |
Last flight of the day
On BOS → PHL, each airline's last flight of the day was cancelled 4.6% of the time, against 3.1% for its earlier flights (1.5× as often). It arrived 3+ hours late 2.8% of the time (earlier flights: 2.3%). 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 | 7:37 p.m. | 5.2% | 3.6% | 2.8% | first flight 6:00 a.m. |
| JetBlue | 6:21 p.m. | 4.2% | 2.7% | 3.0% | first flight 6:49 a.m. |
| Delta Air Lines | 8:35 p.m. | 4.4% | 2.2% | 4.1% | first flight 6:50 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 PHL 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 (85%). Worst: July (68%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 779 | 67% | 6.7% |
| Tuesday | 727 | 75% | 3.9% |
| Wednesday | 722 | 77% | 1.3% |
| Thursday | 759 | 72% | 2.8% |
| Friday | 753 | 75% | 1.2% |
| Saturday | 552 | 83% | 2.5% |
| Sunday | 744 | 68% | 5.5% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 89 · air traffic/airport 50 · airline 35
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 |
|---|---|---|---|---|---|---|
| AA 1146 | 6:00 a.m. | 146 | 91% | 3.4% | −15 min | American Airlines |
| DL 5845 | 6:50 a.m. | 345 | 87% | 2.6% | −14 min | Republic Airways |
| B6 1159 | 7:00 a.m. | 147 | 89% | 4.1% | −17 min | JetBlue |
| AA 2764 | 8:00 a.m. | 176 | 89% | 0.6% | −11 min | American Airlines |
| DL 5805 | 10:50 a.m. | 191 | 85% | 0.0% | −12 min | Republic Airways |
| DL 5706 | 3:10 p.m. | 228 | 71% | 7.5% | −5 min | Republic Airways |
| DL 5714 | 5:20 p.m. | 236 | 62% | 7.2% | −6 min | Republic Airways |
| B6 2459 | 6:21 p.m. | 158 | 55% | 7.0% | +3 min | JetBlue |
| AA 1776 | 6:54 p.m. | 217 | 70% | 3.7% | −4 min | American Airlines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Feb 23, 2026 | 14 | 0% | 14 |
| Jan 25, 2026 | 13 | 0% | 13 |
| Jan 26, 2026 | 13 | 0% | 9 |
| Jan 27, 2026 | 12 | 0% | 4 |
| Jan 19, 2026 | 13 | 8% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Boston or Philadelphia. MHT → PHL has been 7 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| BOS → PHL (this route) | 5,036 | 73% | 3.5% |
| MHT → PHL Manchester-Boston to Philadelphia | 1,230 | 80% | 2.4% |
| PVD → PHL Rhode Island T. F. Green to Philadelphia | 1,315 | 77% | 5.1% |
Questions
How often are flights from BOS to PHL on time?
73% of 5,036 scheduled flights from Boston, MA to Philadelphia, PA arrived within 15 minutes of schedule between September 2025 and August 2026. 3.5% were cancelled.
What is the best time of day to fly BOS to PHL?
Flights scheduled to leave at 6 a.m. were the most reliable (92% on time). The 6 p.m. departures were the least (50%).
Which airline is most on time from BOS to PHL?
American Airlines: 75% of its 2,844 flights on the route arrived on time. Delta Air Lines: 74%. JetBlue: 68%.
What month has the most delays from BOS to PHL?
July (68% on time). The best month is November (85%), over 2023–2026.
Is the last flight of the day from BOS to PHL more likely to be cancelled?
Yes. Each airline's last BOS–PHL flight of the day was cancelled 4.6% of the time over the past year, against 3.1% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- PHL → BOS (return)
- Boston Logan (BOS) delays by hour
- Flights into Philadelphia (PHL)
- American Airlines on-time record
- Delta Air Lines on-time record
- JetBlue on-time record
- Frontier Airlines 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.