How to save on round-trip tickets?

Most airline tickets are purchased round trip. This type of transportation is called Round Trip (RT), i.e., from point A to point B and back to point A. Regarding the pricing of RT fares, airlines that offer the option to book tickets on Kupi.com on their website can be divided into 2 groups: 1. Provide passengers with flexible choice; you choose which fare you fly there with and which you fly back with.

2. Immediately offer an RT ticket, without providing the passenger with a choice of fare for each segment of the journey.  

There are few airlines that fall into the second category, but it is on their tickets that you can save quite significant amounts. How can this be done? Previously, there was a rule that the fare applied to the outbound fare component must be equal to the fare applied to the inbound fare component. However, some airlines still use this rule. For the passenger, this means that if there are tickets for all fares on the outbound flight, including the cheapest ones:

but for the return flight, the cheapest fare is not available,

then the system will offer you more expensive tickets, for which the fare equality rule applies. If we take the example from the images above, companies from the first group will offer you to buy tickets on Kupi.com for 9,212 + 12,137 = 21,349 rubles. And from the second group for 12,137 + 12,137 = 24,274 rubles. How not to overpay? Try searching for 2 one-way tickets (OW). For example, Emirates airline offers us RT tickets Moscow-Dubai for 34,414 rubles, but if we search separately, we get: 1. Outbound ticket: Moscow - Dubai departing April 19 for 13,673 rubles.

2. Return ticket: Dubai-Moscow departing April 20 for 13,890 rubles (AED 1740).

Thus, we will spend 27,569 rubles on the flight and save 6,845 rubles! By booking tickets separately, we chose the cheapest fare -  Skywards Saver Fare, while the system offered us a more expensive Skywards Flex Fare.