Plane and Train
If you are traveling by plane, it will be most convenient for you to fly to Amsterdam Airport Schiphol.
From Schiphol trains leave for Groningen on a regular basis. You can plan your trip and buy tickets online here or buy a single-use chipcard at the ticket machines of the “Nederlandse Spoorwegen” at the airport.
If you use the single-use chipcard you need to “check in” by tapping the card to a check in mashine before you enter the train.
Be aware that you might have to switch trains (usually in Zwolle) and that some trains split up on the way, with only one half of the train going to Groningen.
Direct Flight from London Southend
If you are traveling from London, you can also take a direct flight from London Southend to Groningen Airport Eelde.