How to redeem your voucher:
Log on to eurowings.com.
Start the standard booking process and select the flights you wish to travel on.
Complete the passenger details page.
Select “redeem voucher” as the form of payment in the “payment” section.
Enter your flight voucher code. The voucher value will now be deducted from the total cost of the flights selected.
If the total cost of the selected flights at the time of booking exceeds the value of the voucher, the remaining amount can be paid by credit card or debit card. If the total cost of the selected flights at the time of booking is less than the voucher value, your voucher will retain the value of the remaining balance. You can use it for your next flight booking.