About 1 in 3 DL 5399 flights from Portland arrived 15+ minutes late, diverted or cancelled over the past year (33%); 7.1% were cancelled. The typical flight landed 4 minutes early.
DL 5399: PWM → JFK
Scheduled to leave Portland at 2:30 p.m. local time, operated by Endeavor Air as 9E 5399. Over the past year it arrived on time 67% of the time (254 flights), in line with other DL flights on the route at that hour (68%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Portland to New York (100% of days). Delta Air Lines's last PWM–JFK flight was cancelled 7.2% of the time, against 6.0% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 6:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 38 | 61% |
| Tuesday | 37 | 62% |
| Wednesday | 37 | 78% |
| Thursday | 35 | 60% |
| Friday | 35 | 71% |
| Saturday | 35 | 74% |
| Sunday | 37 | 59% |
Why it was late
All flights PWM → JFK · Connecting off DL 5399? Check the risk
DL 5399: JFK → PWM
Scheduled to leave New York at 12:29 p.m. local time, operated by Endeavor Air as 9E 5399. Over the past year it arrived on time 71% of the time (231 flights), worse than other DL flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 34 | 53% |
| Tuesday | 33 | 67% |
| Wednesday | 33 | 79% |
| Thursday | 33 | 82% |
| Friday | 32 | 75% |
| Saturday | 32 | 81% |
| Sunday | 34 | 62% |
Why it was late
All flights JFK → PWM · Connecting off DL 5399? Check the risk
Questions
How often is DL 5399 from PWM to JFK late?
Delta Air Lines 5399 from Portland, ME to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 33% of 254 scheduled flights between September 2025 and August 2026. 7.1% were cancelled.
How often is DL 5399 from JFK to PWM late?
Delta Air Lines 5399 from New York, NY to Portland, ME arrived 15 or more minutes late, was diverted or was cancelled on 29% of 231 scheduled flights between September 2025 and August 2026. 1.7% 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.