| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Oct 25 | IAD | LHR | 22:16 | 09:00 |
Delayed
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KLM Flight KL4821 connects Washington, United States to London, United Kingdom, taking off from Washington Dulles International Airport IAD and landing at London Heathrow Airport LHR.
How long is the KL4821 flight from Washington to London?
The average flight time from Washington to London is 5 hours and 44 minutes. The flight distance is 5901 km / 3667 miles and the average flight speed is 1029 km/h / 640 mph.
How many KL4821 flights are operated per week?
1 flight per week. The flight KL4821 is operated on Sunday.
What is the On-Time Performance (OTP) of KLM Flight KL4821 Washington to London?
The Airportia On-Time Performance Rating for KLM Flight KL4821 is 3.3/5 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 Monday, October 26th, 2026 with the flight status being En-Route on 09:00.
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, 100% of all KL4821 flights are delayed. The average delay is 100 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 Washington IAD: UA992, VS22, UA797, AA5457
Other flights arriving at London LHR: AA730, QR105, VS22, BA1383
All flights connecting Washington IAD to London LHR.