72% of flights from New York to Portland arrived on time over the past 12 months. That is worse than the typical U.S. route. The noon departures ran on time 77% of the time; the 10 p.m. ones 67%. Most reliable airline: Delta Air Lines (74%). 15% 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 JFK → PWM: when a flight was late, it was under 45 minutes late 44% of the time. About 1 in 11 flights landed an hour or more late, and 1 in 65 three hours or more; 5.8% were cancelled outright.
- On time or early72%
- 15–30 min late6.1%
- 30–60 min late6.8%
- 1–2 hours late6.1%
- 2–3 hours late1.8%
- 3+ hours late1.5%
- Diverted0.1%
- Cancelled5.8%
Share of all 1,038 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 |
|---|---|---|---|---|---|---|---|
| Delta Air Lines | 711 | 74% | 6.5% | −14 min | 7.9% | +73 min | Endeavor Air 91%, Republic Airways 9% |
| JetBlue | 327 | 68% | 4.3% | −10 min | 12.8% | +76 min | JetBlue |
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 JFK). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Delta Air Lines | JetBlue |
|---|---|---|
| noon | 76% | 78% |
| 10 p.m. | 71% | — |
Last flight of the day
On JFK → PWM, each airline's last flight of the day was cancelled 9.7% of the time, against 2.6% for its earlier flights (3.7× as often). It arrived 3+ hours late 0.9% of the time (earlier flights: 2.2%). 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 |
|---|---|---|---|---|---|
| JetBlue | 10:35 p.m. | 8.6% | 0.9% | 2.6% | first flight 12:15 p.m. |
| Delta Air Lines | 10:59 p.m. | 10.1% | 0.9% | 2.6% | first flight 12:45 p.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 PWM 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 (90%). Worst: July (53%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 146 | 67% | 7.5% |
| Tuesday | 138 | 78% | 5.1% |
| Wednesday | 149 | 75% | 2.7% |
| Thursday | 153 | 73% | 5.2% |
| Friday | 152 | 80% | 4.6% |
| Saturday | 147 | 72% | 5.4% |
| Sunday | 153 | 58% | 9.8% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: air traffic/airport 32 · airline 16 · weather 12
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 |
|---|---|---|---|---|---|---|
| B6 508 | 12:00 p.m. | 151 | 76% | 2.0% | −13 min | JetBlue |
| DL 5399 | 12:29 p.m. | 231 | 71% | 1.7% | −9 min | Endeavor Air |
| B6 308 | 10:45 p.m. | 176 | 61% | 6.3% | −3 min | JetBlue |
| DL 5411 | 10:59 p.m. | 347 | 71% | 10.1% | −17 min | Endeavor Air |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Aug 16, 2026 | 4 | 0% | 0 |
| Jul 5, 2026 | 4 | 0% | 2 |
| Jul 23, 2026 | 4 | 0% | 0 |
| Jul 4, 2026 | 4 | 0% | 1 |
| Jul 18, 2026 | 4 | 0% | 2 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of New York or Portland. EWR → PWM has been 7 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| JFK → PWM (this route) | 1,038 | 72% | 5.8% |
| EWR → PWM Newark to Portland Jetport | 1,388 | 79% | 4.3% |
| LGA → PWM LaGuardia to Portland Jetport | 1,605 | 74% | 4.6% |
Questions
How often are flights from JFK to PWM on time?
72% of 1,038 scheduled flights from New York, NY to Portland, ME arrived within 15 minutes of schedule between September 2025 and August 2026. 5.8% were cancelled.
What is the best time of day to fly JFK to PWM?
Flights scheduled to leave at noon were the most reliable (77% on time). The 10 p.m. departures were the least (67%).
Which airline is most on time from JFK to PWM?
Delta Air Lines: 74% of its 711 flights on the route arrived on time. JetBlue: 68%.
What month has the most delays from JFK to PWM?
July (53% on time). The best month is November (90%), over 2023–2026.
Is the last flight of the day from JFK to PWM more likely to be cancelled?
Yes. Each airline's last JFK–PWM flight of the day was cancelled 9.7% of the time over the past year, against 2.6% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- PWM → JFK (return)
- New York JFK (JFK) delays by hour
- Flights into Portland Jetport (PWM)
- Delta Air Lines on-time record
- JetBlue 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.