You have chosen United Airlines. For United we charge you €10 per flight. For itineraries with multiple flights we only charge US$20. This includes United, United Express, Ted and (where applicable) codeshare flights.
If you wish to reserve seats, please let us know as much about your itinerary as possible. We would need the names of all passengers travelling, the flight numbers and dates and ideally the reservation number. Your name and email-address are required for us to get back to you. Of course all information is handled completely confidential and will never be released to third parties.