One of the most significant factors in the cost of bus hire is the size of the vehicle. Choosing a 57-seat coach when you only have 20 passengers can lead to unnecessary expenses. Minibuses (12–24 seats) are the most cost-effective for small groups and airport runs, whereas medium (25–40 seats) and large coaches (up to 60 seats) are priced higher due to fuel consumption and maintenance. Matching the bus size to your group size is the easiest way to keep costs low.