74% 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 8 a.m. departures ran on time 89% of the time; the 9 p.m. ones 62%. Most reliable airline: American Airlines (83%). 13% 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 LGA → PWM: when a flight was late, it was under 45 minutes late 47% of the time. About 1 in 12 flights landed an hour or more late, and 1 in 134 three hours or more; 4.6% were cancelled outright.
- On time or early74%
- 15–30 min late6.5%
- 30–60 min late5.9%
- 1–2 hours late6.3%
- 2–3 hours late1.6%
- 3+ hours late0.7%
- Diverted0.0%
- Cancelled4.6%
Share of all 1,605 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 | 1,199 | 71% | 5.6% | −9 min | 9.3% | +64 min | Republic Airways 68%, Endeavor Air 31%, Delta Air Lines 1% |
| American Airlines | 406 | 83% | 1.7% | −9 min | 6.4% | +63 min | Republic Airways 81%, American Airlines 19% |
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 LGA). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Delta Air Lines | American Airlines |
|---|---|---|
| 9 a.m. | 80% | — |
| 11 a.m. | 75% | 85% |
| 2 p.m. | 69% | — |
| 3 p.m. | 67% | — |
| 9 p.m. | 62% | — |
Last flight of the day
On LGA → PWM, each airline's last flight of the day was cancelled 6.1% of the time, against 3.8% for its earlier flights (1.6× as often). It arrived 3+ hours late 0.5% of the time (earlier flights: 0.9%). 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 | 11:14 a.m. | 1.5% | 1.5% | 1.5% | first flight 7:59 a.m. |
| Delta Air Lines | 9:59 p.m. | 8.6% | 0.0% | 4.3% | first flight 8:50 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 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 (83%). Worst: July (69%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 244 | 73% | 7.8% |
| Tuesday | 240 | 75% | 5.4% |
| Wednesday | 238 | 78% | 1.7% |
| Thursday | 237 | 73% | 4.2% |
| Friday | 238 | 78% | 2.5% |
| Saturday | 171 | 75% | 4.1% |
| Sunday | 237 | 69% | 6.3% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 37 · air traffic/airport 21 · weather 16
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 5346 | 11:00 a.m. | 165 | 74% | 2.4% | −7 min | Endeavor Air |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Oct 14, 2025 | 6 | 0% | 0 |
| Oct 13, 2025 | 6 | 0% | 1 |
| Apr 19, 2026 | 5 | 0% | 0 |
| Nov 9, 2025 | 3 | 0% | 1 |
| Dec 14, 2025 | 3 | 0% | 1 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of New York or Portland. EWR → PWM has been 4 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| LGA → PWM (this route) | 1,605 | 74% | 4.6% |
| EWR → PWM Newark to Portland Jetport | 1,388 | 79% | 4.3% |
| JFK → PWM New York JFK to Portland Jetport | 1,038 | 72% | 5.8% |
Questions
How often are flights from LGA to PWM on time?
74% of 1,605 scheduled flights from New York, NY to Portland, ME arrived within 15 minutes of schedule between September 2025 and August 2026. 4.6% were cancelled.
What is the best time of day to fly LGA to PWM?
Flights scheduled to leave at 8 a.m. were the most reliable (89% on time). The 9 p.m. departures were the least (62%).
Which airline is most on time from LGA to PWM?
American Airlines: 83% of its 406 flights on the route arrived on time. Delta Air Lines: 71%.
What month has the most delays from LGA to PWM?
July (69% on time). The best month is November (83%), over 2023–2026.
Is the last flight of the day from LGA to PWM more likely to be cancelled?
Yes. Each airline's last LGA–PWM flight of the day was cancelled 6.1% of the time over the past year, against 3.8% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- PWM → LGA (return)
- LaGuardia (LGA) delays by hour
- Flights into Portland Jetport (PWM)
- Delta Air Lines on-time record
- American 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.