Do you have a Traject Vrij subscription? Book your international ticket from the station that your subscription no longer covers. That way, at off-peak hours you will receive a 40% discount on the domestic route that is not included in your subscription. Please indicate this while booking:
Via NSInternational.nl: choose the option '40% discount in the Netherlands'.
Via an NS ticket machine: choose the option 'NS route with discount'
Then you will receive an international ticket which includes the 40% or 100% discount. Can you not travel there and back with the same discount? You can also book 2 one-tickets. Do not forget to bring your Traject Vrij subscription as well as your ticket on your trip. You should be able to show both.
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