On many journeys, particularly longer cross-country routes, the savings can be significant. Since launching in August 2025, the largest saving we found for a single user was £181.26 on one journey (even I was surprised!).
Savings vary by route, time, and availability. Split ticketing doesn’t produce a cheaper price on every journey, and on some routes the through-fare is the same or lower. If it's more expensive with split ticketing, Choo Choo wouldn't show you this option.