Ieper is a little town not far from the Belgian coast. Here you get some possibilities to reach Ieper. If you come with the Belgian Railways, you can get a much cheaper ticket if you are younger than 26 years old. You then can buy a GO PASS for 10 journeys in 2nd class with the Belgian Railways to whatever place in Belgium. Its price is 39 Euro and it is valid for 1 year. That's just 3,9 Euro per single journey & you can sell the remainder of your ticket to someone else later on!! This Go Pass isn't an individual ticket. You can use it for a group of young people too. If you are e.g. with 5 persons of less than 26 years old, you have immediately one travel from e.g. Brussel or whatever other place in Belgium to Ieper for 5 persons, and one travel for 5 persons back to Brussel or whatever other place in Belgium for a very cheap price. To get more info: see the website of the Belgian Railways.

From Gent

By car: Take the crossroad to Kortrijk (E17), and then the crossroad to Ieper (A19).
By train: Take the train to Kortrijk, and in Kortrijk the train to Poperinge. Leave the train in Ieper.

From Oostende

By car: Take the way to Torhout, then the way to Roeselare, and then the way to Ieper.
By train: Take the train to Roeselare-Kortrijk, and in Kortrijk the train to Poperinge. Leave the train in Ieper. Another possibility is that you take the train to Roeselare and then take the bus to Ieper.

From Zeebrugge

By car: Take the way to Brugge, then the way to Torhout, then the way to Roeselare, and then the way to Ieper.
By train: Take the train to Brugge. Then take the train to Roeselare-Kortrijk, and in Kortrijk the train to Poperinge. Leave the train in Ieper. Another possibility is that you take the train to Roeselare and then take the bus to Ieper.

From Brussel

By car: Take the crossroad to Gent (E40), then the crossroad to Kortrijk (E17), and then the crossroad to Ieper (A19).
By train: In the airport of Zaventem, you can take a train to Brussel. Then take the train to Kortrijk, and in Kortrijk the train to Poperinge. Leave the train in Ieper. Another possibility is that you take in Brussel the train to Gent, in Gent the train to Kortrijk, and in Kortrijk the train to Poperinge.