- Seville: Seville´s airport is located about 15-20 minutes from the city center. The airport itself is tiny. There is only one exit door for all flights. After exiting outside, you will have two options for transport into the city. The first (and easiest) is to simply take a taxi. There is a fixed rate from the airport to the first stop anywhere in the city (it changes somewhat depending on the day, luggage you have with you, etc.). This fixed rate tends to be about 25-30 euros total (not per passenger). For those unsure of tipping practices in Spain, generally it is not necessary to leave a tip when taking a taxi.
The second option is to take the public bus, which stops at the far end of the terminal (opposite end from where the taxis line up). If it doubt, just ask. This bus runs every 20-30 minutes or so and will take you into the city center. The fare is about 4 euros. The only problem with this is that once in the city center, you will most likely need to take a taxi to get to your final destination. It’s a good idea to have some small change if you opt for this option, as the bus drivers will not accept bills larger than 5 euros.
- Madrid: Madrid’s airport is located about 25-30 minutes from the city center. There are many options for transport, including taxi, train (both Cercanias and metro), and bus. The easiest option is to simply take a taxi. It should cost about 30-40 euros to go the center, depending on your final destination. There is also a Cercanias train that runs every half hour from Terminal 4 to various stations in Madrid. More information can be found here: http://guias-viajar.com/madrid/capital/trenes-cercanias-aeropuerto-barajas/
If you are feeling a bit more adventurous, you may consider taking the metro. This is a very economical alternative, but it will certainly take a bit more time, and could involve changing lines. More information can be found here: http://www.metromadrid.es/es/viaja_en_metro/red_de_metro/planos/index.html
- Barcelona: Barcelona´s airport is located about 20-25 minutes from the city center. There are several options for transportation to arrive to the city center including metro, taxi, or Aerobus (a shuttle bus service). The easiest option is to simply take a taxi. It should cost about 25-30 euros, depending on your final destination. The Aerobus option also take you directly to the city center. The bus runs every 5 minutes from Terminal 1 and Terminal 2. A single ticket costs 5,90 euros which can be purchased upon arrival (cash only) or online here: http://www.aerobusbcn.com/en/buy-tickets.