Originally Posted by
3Cforme
It can be even easier than that: look on Matrix for the cheapest itin between origin and destination and see if, going or returning, it's using more than one are component. If it isn't (let's say your Jacksonville-Atlanta-Seattle trip is a single component), constructing a multi-city itinerary (looking segment by segment in TTT's words) will NOT be cheaper.
Fare 1: Carrier DL UAUUA0BQ JAX to SEAPassenger type ADT, one-way fare, booking code ECovers JAX-ATL (Economy), ATL-SEA (Economy)$208.37
That's not exactly what I meant. Searching for each "leg", as I stated, meant to search for outbound and return separately. The fare component tip you listed doesn't address that as there will be two fare components on a round-trip (one for the outbound and one for the return).