RealCost Guide
100 Mile Trip Cost UK
A 100-mile trip is a proper journey. It might be a motorway trip, airport run, family visit, day trip, work journey, weekend away or the outward leg of a longer return journey.
Use this page to estimate the fuel side of a 100-mile trip, then check whether return distance, passengers, parking, tolls, rest stops, airport charges or train alternatives change the real decision.
Plan the fuel cost of a 100-mile trip
Use the trip fuel planner below to estimate the fuel cost of your journey. For a 100-mile one-way trip, enter 100 miles. For a 100-mile trip there and back, enter 200 miles.
This calculator estimates the fuel side of the trip. Add parking, tolls, airport drop-off charges, rest stops, detours, passenger splitting and vehicle wear separately where relevant.
Quick answer: At £1.50 per litre and 40 MPG, a 100-mile trip costs about £17.05 in fuel. If it is 100 miles there and 100 miles back, the 200-mile return trip costs about £34.09 in fuel.
100-mile trip or 100-mile return trip?
With a 100-mile trip, confusing one-way distance with the return journey can seriously understate the cost.
100 miles one-way
Use 100 miles if the destination is 100 miles away and you only want the outward journey cost.
100 miles there and back
Use 200 miles if the trip is 100 miles each way. This doubles the fuel cost.
Example fuel cost for a 100-mile trip
These examples use petrol at £1.50 per litre.
50 MPG car
100 miles costs about £13.64 in fuel.
40 MPG car
100 miles costs about £17.05 in fuel.
30 MPG car
100 miles costs about £22.73 in fuel.
What can change the real cost of a 100-mile trip?
Fuel is only the starting point. Real trip costs often depend on the reason for the journey.
Airport trips may include drop-off charges, pick-up fees, short-stay parking or waiting time.
Some routes include tolls, clean-air charges or congestion-style costs.
Motorway stops, food, coffee or charging time can add to the total trip cost.
A 100-mile trip adds tyre wear, servicing demand, mileage and depreciation.
Motorway, rural and mixed 100-mile trips
The route type affects both cost and whether driving is actually worth it.
Motorway trip
Often efficient if traffic is steady, but high speeds, congestion and rest stops can change the real cost.
Rural trip
A-roads, hills, overtaking, bends and slower sections can affect MPG and journey time.
Mixed trip
Most 100-mile trips include local roads, faster roads and destination traffic, so use realistic MPG.
Should you split the cost of a 100-mile trip?
Passengers can make driving much more cost-effective compared with public transport.
Solo trip
You carry the full fuel cost, plus any parking, tolls, drop-off or destination charges.
Two people
A £17.05 fuel cost becomes roughly £8.52 each before extras.
Four people
A £17.05 fuel cost becomes about £4.26 each before extras.
Should you compare driving with train?
At 100 miles, driving is not always the automatic winner.
Driving may win if…
There are several passengers, the destination is awkward by train, you need flexibility or you are carrying luggage.
Train may win if…
You are travelling alone, the rail route is direct, parking is expensive or motorway traffic is likely.
Useful calculators and guides
Use these next depending on whether you want trip cost, distance cost or wider travel comparison.
Open planner →
Open calculator →
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Read guide →
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