About 1 in 2 F9 4420 flights from Hartford arrived 15+ minutes late, diverted or cancelled over the past year (46%); 2.3% were cancelled. The typical flight landed 7 minutes late.
F9 4420: BDL → SJU
Scheduled to leave Hartford at 1:42 p.m. local time. Over the past year it arrived on time 54% of the time (216 flights), better than other F9 flights on the route at that hour (41%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 29 | 52% |
| Tuesday | 34 | 47% |
| Wednesday | 30 | 47% |
| Thursday | 30 | 53% |
| Friday | 29 | 62% |
| Saturday | 32 | 59% |
| Sunday | 32 | 59% |
Why it was late
All flights BDL → SJU · Connecting off F9 4420? Check the risk
Questions
How often is F9 4420 from BDL to SJU late?
Frontier Airlines 4420 from Hartford, CT to San Juan, PR arrived 15 or more minutes late, was diverted or was cancelled on 46% of 216 scheduled flights between September 2025 and August 2026. 2.3% 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 Frontier Airlines for today's flight. Method.