Stena Line has relaunched its popular Kids Go Free offer for summer, valid on Economy and Flexi motorist fares across Irish Sea routes until January 5, 2026, for bookings made by August 31. Ideal for budget-conscious families, the deal includes fun-filled onboard amenities for kids, spa and dining options for adults, pet-friendly travel, and duty-free savings—making road-trip getaways to the UK and Europe more affordable and enjoyable.