| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Apr 24 | STT | BOS | 14:30 | 18:17 |
Landed
|
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| Apr 23 | STT | BOS | 14:49 | 18:52 |
Landed
|
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| Apr 22 | STT | BOS | 14:54 | 18:49 |
Landed
|
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| Apr 21 | STT | BOS | 17:01 | 20:38 |
Delayed
|
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| Apr 20 | STT | BOS | 14:33 | 18:15 |
Landed
|
Track > |
| Apr 19 | STT | BOS | 14:42 | 18:29 |
Landed
|
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| Apr 18 | STT | BOS | 14:39 | 18:25 |
Landed
|
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| Apr 17 | STT | BOS | 15:02 | 18:42 |
Landed
|
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| Apr 16 | STT | BOS | 14:34 | 18:28 |
Landed
|
Track > |
KLM Flight KL7521 connects St. Thomas, U.S. Virgin Islands to Boston, United States, taking off from St. Thomas Cyril E. King Airport STT and landing at Boston Logan International Airport BOS.
How long is the KL7521 flight from St. Thomas to Boston?
The average flight time from St. Thomas to Boston is 3 hours and 47 minutes. The flight distance is 2732 km / 1697 miles and the average flight speed is 720 km/h / 447 mph.
What is the On-Time Performance (OTP) of KLM Flight KL7521 St. Thomas to Boston?
The Airportia On-Time Performance Rating for KLM Flight KL7521 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight KL7521 arriving at?
Flight KL7521 arrives at Boston Logan International Airport (BOS) Terminal A.
When was the latest KL7521 flight?
The latest flight took off on Friday, April 24th, 2026 with the flight status being Landed on 18:17.
How else can the flight KL7521 be referenced as?
This KLM flight can also be referenced as KLM7521, KL 7521, KLM 7521.
How often is flight KL7521 delayed?
On average, 11% of all KL7521 flights are delayed. The average delay is 99 minutes.
Can I get compensation for my delayed or cancelled KL7521 flight or baggage issues?
If your KL7521 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our KL7521 Flight Tracker above for more details.
Other flights departing from St. Thomas STT: DL352, B6808, UA2365, NK895
Other flights arriving at Boston BOS: DL352, B6452, NK1742, DL5868
All flights connecting St. Thomas STT to Boston BOS.