If you’re planning to book a flight with Ryanair soon, there might be a clever way for you to jet off to your favourite destination for less.

According to the ’20 Ryanair tips’ page on moneysavingexpert.com (MSE), which was founded by Martin Lewis, travellers should check if booking their return flight in euros could save them money. The experts at MSE suggest that this “nifty trick” could potentially cut costs, but it requires completing your booking in separate transactions. “It doesn’t always work, but it’s worth checking”, they say.

So how do you go about booking your flight in euros? All you need to do is search for your outbound flight as a one-way ticket and then, in a separate tab, look up the return leg of your journey as a one-way ticket.

MSE explains that the return flight will be priced in the currency of the country from which the flight departs, so you’ll need to check what the equivalent is in pounds. They recommend using TravelMoneyMax to do this. After that step, you then just compare the total cost of both legs with that of a standard Ryanair return flight.

However, MSE warns against accepting “Ryanair’s guaranteed exchange rate”. They explain that after you enter your card details, you should watch out for a “sneaky message showing the cost of your ticket in pounds (using Ryanair’s exchange rate).”

To opt out and use your bank’s exchange rate, which could result in significant savings, you need to click on ‘more information’.

For more tips and tricks, check out their full list here.