| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jul 23 | ATL | LHR | 18:23 | 06:45 |
Landed
|
Track > |
| Jul 22 | ATL | LHR | 18:37 | 07:03 |
Landed
|
Track > |
| Jul 21 | ATL | LHR | 19:02 | 07:35 |
Landed Late
|
Track > |
| Jul 20 | ATL | LHR | 18:46 | 07:19 |
Landed
|
Track > |
| Jul 19 | ATL | LHR | 19:46 | 08:15 |
Delayed
|
Track > |
| Jul 18 | ATL | LHR | 18:36 | 07:06 |
Landed
|
Track > |
| Jul 17 | ATL | LHR | 18:58 | 07:44 |
Landed Late
|
Track > |
| Jul 16 | ATL | LHR | 19:41 | 08:19 |
Delayed
|
Track > |
| Jul 15 | ATL | LHR | 18:35 | 07:15 |
Landed
|
Track > |
| Jul 14 | ATL | LHR | 18:33 | 07:30 |
Landed Late
|
Track > |
KLM Flight KL4821 connects Atlanta, United States to London, United Kingdom, taking off from Atlanta Hartsfield-Jackson International Airport ATL and landing at London Heathrow Airport LHR.
How long is the KL4821 flight from Atlanta to London?
The average flight time from Atlanta to London is 7 hours and 35 minutes. The flight distance is 6760 km / 4201 miles and the average flight speed is 891 km/h / 554 mph.
How many KL4821 flights are operated per week?
6 flights per week. The flight KL4821 is operated on Monday, Tuesday, Wednesday, Thursday, Saturday and Sunday.
What is the On-Time Performance (OTP) of KLM Flight KL4821 Atlanta to London?
The Airportia On-Time Performance Rating for KLM Flight KL4821 is 4.7/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight KL4821 arriving at?
Flight KL4821 arrives at London Heathrow Airport (LHR) Terminal 3.
When was the latest KL4821 flight?
The latest flight took off on Friday, July 24th, 2026 with the flight status being Landed on 06:45.
How else can the flight KL4821 be referenced as?
This KLM flight can also be referenced as KLM4821, KL 4821, KLM 4821.
How often is flight KL4821 delayed?
On average, 60% of all KL4821 flights are delayed. The average delay is 32 minutes.
Can I get compensation for my delayed or cancelled KL4821 flight or baggage issues?
If your KL4821 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 KL4821 Flight Tracker above for more details.
Other flights departing from Atlanta ATL: DL821, VS104, WN4558, WN4778
Other flights arriving at London LHR: TG910, VS104, UA14, VS46
All flights connecting Atlanta ATL to London LHR.