How can I get a refund for a missed flight with KLM Airlines?
If you missed your flight for any reason with the airline, then below are the different steps that you need to keep in mind:

It would help to inform the airline that you can not board the flight on time.
The other important point to Get a Refund for the KLM Missed Flight is your flight should be refundable.
However, cancel your trip if you can't reach the airport & claim the refund.
What happens if you miss the KLM flight?
If you miss your flight for any reason, it is better to dial the official number & talk to a KLM Airlines live person. Moreover, you can provide a valid reason for missing the flight.

It can help you to board the next available flight without any fee. On the other hand, if you missed the flight & didn't inform the airline about the same, then you have to bear the consequences:

The airline cancels the reservation if you don't board a flight.
However, a no-show rule and penalties will be imposed on the passenger.