How to Use the Round-Trip vs Two One-Way Calculator
Flying the same route can cost very different amounts depending on whether you book a single round trip or two separate one-way tickets. This calculator takes your round-trip price and the price of each one-way leg, then instantly shows which option is cheaper and by exactly how much.
Many airlines offer round-trip-only discount fares to encourage bundled bookings, so under the same conditions two one-ways often add up to more than a round trip. On the other hand, if you're combining different airlines, planning a multi-city trip that lands somewhere different from where it starts, or two budget-airline sales happen to overlap, booking two one-ways can actually be cheaper — or give you more scheduling freedom.
Price isn't the whole story either — checked baggage rules, mileage earning, and refund or change policies can all differ between round-trip and one-way fares, so weigh those extras alongside the price difference before you book.
Frequently Asked Questions
Many airlines run round-trip-only discount fares to encourage round-trip bookings. Booking each leg separately as a one-way often misses that discount, so the combined price of two one-ways can end up higher than a round trip.
Yes. When you're flying different airlines each way, planning a multi-city trip into one place and out of another, or catching two overlapping budget-airline sales, two one-way tickets can be cheaper or give you more schedule flexibility.