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International Connecting Flights

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My fiance and I are planning a two week trip to Spain and Portugal in September. We are flying from San Francisco to Barcelona, where we will then jump on a train to travel across Spain and into Portugal, ultimately ending our trip in Porto. Since our trip is beginning and ending in two different cities (and two different countries, for that matter) we are trying to determine the best option for our flight itinerary that will be the least expensive. We have done the multi-city flight option before, where we fly into one airport and out of another, but it is much cheaper to fly roundtrip from SFO to BCN and BCN to SFO.

So here is the main question - a flight from Porto to BCN only costs $20. We are contemplating following our original travel plan and then on the day we fly home, fly from Porto to BCN where we will then jump on our return flight to SFO. Question is, if we book the Porto to BCN flight separate from our roundtrip SFO to BCN flight, what will that look like in terms of connecting? After arriving from Porto, do we need to exit the airport, go through customs and security again to get on our flight to SFO? Or is it as simple as landing and walking to the terminal for the SFO flight? Also, if we want to check bags, would that require an exit and reentry as well?

Wasn't sure how to search for this at Google, so I figured you fellow jet setters may have some handy wisdom to provide. All info is much appreciated!! :)

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