What are the most popular routes to Grou?
| Alkmaar - Grou | Average priceR 1 326 | Average duration3h 28m | Daily departures61 | |
| Heerhugowaard - Grou | Average priceR 1 326 | Average duration3h 45m | Daily departures20 | |
| Amsterdam - Grou | Average priceR 1 294 | Average duration2h 33m | Daily departures212 | |
| Rotterdam - Grou | Average priceR 1 164 | Average duration3h 36m | Daily departures117 | |
| Eindhoven - Grou | Average priceR 1 179 | Average duration3h 37m | Daily departures61 | |
