Ypres city centre is best approached on foot.
For visiting the war graves and memorials, one could use a car or cycle. Take the guided "Battle field tour" -bus, or buy an audio tour on the internet - same sites, but a lot cheaper if you have your own transport
Ypres itself is easily reachable by train, or by car - highway to Courtray Kortrijk on signs, then follow directions for Ieper A19.
From the ports of Calais or Dunkerque, take the A16 East, turning off at junction 28 A25 towards Lille. Get off at Junction 13 and follow the signs for Ypres Ieper.
