I know if I take a flight from country X to country Y, it is cheaper if there is a stopover in between the 2 countries. However, I'm not sure what it really means as I have never taken a flight with stopover and is currently thinking of getting a cheaper air ticket by doing so.
For a stopover which is within 24 hours whereby I will continue my journey to my destination, can I allow to exit the airport and be back before the departure time to catch the connecting flight or am I only allowed to stay within the waiting premise until it is boarding time? Am I allowed to carry things bought from that country to my final destination during my stopover?
What is the difference between a "stopover" and "transit"? Don't both have the same meaning as a temporary stop before reaching the destination?
In technical airline lingo, a STOPOVER occurs when a passenger arrives at an intermediate point and is scheduled to depart later than 24 hours after arrival (in local time). An exception to this is for travel wholly within Central America or for travel wholly between Central America and Panama, when a passenger arrives at an intermediate point and is scheduled to depart later than 6 hours after arrival (in local time).
If the connecting time is less than 24 hours (or less than 6 hours in the case of Central America) as per above definition, then it is a TRANSIT STOP, and the term TRANSITING IN XXX (CITY NAME), like TRANSITING IN SEOUL, is used.
They are usually interchanged by non-airline staff or non-travel agents but this should not be the case because fares are largely dependent on STOPOVERS and TRANSIT STOPS. Stopovers do not necessarily bring down fares. On the contrary, some excursion and advance purchase fares have add-ons for stopovers.
If you are purchasing a regular published fare, the fare rules will dictate if stopovers are allowed or not. For example, a regular economy or business class fare will allow unlimited stopovers en route without changing the fare. However, there are some cities that impose taxes (terminal fees that are collected during ticket issuance) and these are added to the fare. If you choose not to make a stopover at one city and eventually decide to cut your journey and make a stopover when you get there, either the airline serving your onward connecting flight will collect the tax from you and reissue your ticket or you would have to pay the tax at the airport. But, as I've said, some budget fares do not allow stopovers or allow stopovers for an additional fee. Consult your travel agent about the different fare levels that are available for your routing.
You are allowed to exit the airport during transits, but that means clearing immigration and that would be dependent on your nationality. If a visa is required for your nationality, you should possess one before you can go out of the airport. If you can avail of a visa on arrival, you would have to fill up some forms and pay a visa-on-arrival fee. If you are visa exempt, then you can go ahead and exit the airport. Just make sure you go back to the airport in time for your onward flight.
As for shopping in the transit city, you can do so if you exit the airport, subject to customs regulations of the transit country. If you can't leave the airport or decide not to exit the airport, you can buy stuff at the duty-free shops in the transit area.
I would be able to give you more detailed advice if you can provide your origin country and city, your transit country and city, your destination country and city, and your nationality ( the country that issued your passport).