How do I find Error Fares?
Finding error fares manually is a laborious process. Despite the fact that error fares occur very frequently, they`re still something of a needle in a haystack. Why? Well, there are an unbelievably high number of flights / flight combinations on offer.
An example calculation from ITA :
Boston (BOS: Boston Logan airport) - San Francisco (SFO: San Francisco International airport)
Outward flight on 15.10.2010
Return flight on 22.10.2010
Possibilities for this combination: 3.604.439.023
So, over three million connections - and for only one route! Of course, as a rule, only a small number of these possibilities are displayed to the searcher. For those wishing to learn more, this German-language article on the unbelievable number and cost of flight searches comes highly recommended (thanks, Florian!):
Warum eine einzige Flugsuche Millionen kostet ('Why a Single Flight Search Costs Millions'): http://www.flocutus.de/flugsuche-teuer/
When we consider the above, it`s all too evident why searching manually for error fares is an incredibly difficult task.
Error fares are usually found by accident. Of course, one can speed up the process by being well informed! I recommend the following for all error fare newbies:
For those who want to try it manually, there`s a good guide here: http://thriftynomads.com/airline-error-mistake-fares-cheap-flights/