EU261 / UK261 · No win, no fee

KL4829 flight compensation

KLM flight KL4829 is a scheduled service operating from Seattle–Tacoma International Airport to London Heathrow Airport.

Check your KL4829 flight

Quick facts

Flight number: KL4829
Airline: KL
ICAO airline code: KLM
Origin airport: Seattle–Tacoma International Airport
Destination airport: London Heathrow Airport
Distance category: Long-haul
EU261 protection: No
UK261 protection: Yes
Aircraft: A339
Schedule snapshot: 2 Sept 2026, 01:20 – 2 Sept 2026, 11:10

About KL4829

Passengers travelling on KLM flight KL4829 between Seattle and London may be entitled to compensation if the flight was delayed, cancelled or heavily disrupted.

How much compensation can you receive?

Under UK261 the amounts are £220, £350 or £520 depending on distance.

Up to 1,500 km

£220

Short-haul

1,500–3,500 km

£350

Medium-haul

Over 3,500 km

£520

Long-haul

Passenger rights under EU261

UK261 can provide a fixed amount for a long delay, some cancellations, or denied boarding when its conditions are met.

When are you entitled to compensation?

Eligible passengers travelling on KL4829 may receive compensation when the disruption was within the airline's control and the legal requirements for the Seattle to London route are met.

KL4829 compensation statistics

The statistics below summarise the passenger-rights framework that may apply to KL4829.

£520

Maximum compensation

Under UK261 the amounts are £220, £350 or £520 depending on distance.

3h+

Delay threshold

Arrival delay normally required.

EU261

Coverage

Applies on eligible European flights.

What happens after you submit your claim?

Once your KL4829 claim has been submitted, FlightClaimly guides you through the compensation process.

1
Submit your claim
You check your flight, add your passenger details and upload the documents needed to start the case.
2
FlightClaimly reviews the case
We review the information and prepare the claim before contacting the airline.
3
The airline responds
The airline reviews the claim and may approve, reject or request additional information.
4
You receive your payout
If the claim is successful, FlightClaimly helps complete the payout process.

How the claim process works

1Check your flight details and tell us what happened.
2Confirm whether the disruption may qualify under EU261 or UK261.
3Add your passenger details and booking reference.
4Sign the authority form so FlightClaimly can handle the claim.
5Upload your supporting documents.
6FlightClaimly submits the claim and follows up with the airline.

Common KL4829 disruption types

✓ Flight delayed more than 3 hours
✓ Flight cancelled
✓ Missed connection
✓ Denied boarding
✓ Technical problems
✓ Operational disruption
✓ Crew shortage
✓ Strike
✓ Bad weather

Frequently asked questions

Can I claim compensation for a delayed flight?

Yes. If your flight arrived at least three hours late and the disruption was within the airline's control, you may be entitled to compensation under EU261 or UK261.

How much compensation can I receive?

Under UK261 the amounts are £220, £350 or £520 depending on distance.

What documents do I need?

Usually your booking confirmation or boarding pass is enough to get started. In some cases we may request additional documentation.

How long does the claim process take?

Every airline is different. Some claims are resolved within a few weeks, while others may take several months if they are disputed.

Do I pay anything upfront?

No. FlightClaimly works on a no win, no fee basis. You only pay if we successfully recover compensation for you.

KLM (KL)

Seattle (SEA) → London (LHR)

approx. 7,702 km · Long-haul (over 3,500 km)

£520 (UK261), depending on the airline · UK261 depending on the airline · A339 · Amsterdam Airport Schiphol (AMS)

KL 4829 (KL4829) is sold by KLM. On a codeshare another airline may operate the flight, and the operating airline determines which rules apply.

KL4829 departs from United States and lands in United Kingdom. If KLM also operates the flight, UK261 may apply, as KLM is an EU airline. If another airline operates it, that airline decides.

With about 7,702 km between SEA and LHR (long-haul (over 3,500 km)), compensation may be £520 (UK261), depending on the airline, if you are entitled to it. All amounts

Does EU261 apply to KLM flight KL 4829?

No, but UK261 may apply if the operating airline is a UK or EU airline.

Who operates KLM flight KL 4829?

In our data, KLM is the airline selling KL4829. Who actually operates the flight is shown on your ticket or booking confirmation.

Was KL 4829 part of a connecting flight? How is compensation calculated?

Your booking shows this, not the flight number. If KL4829 was part of a connecting journey on one booking, distance is counted from the first departure airport to the final destination, and the delay is counted on arrival at the final destination. The distance band (short-, medium- or long-haul) follows that distance and may then differ from this leg (£520 (UK261), depending on the airline).