If you are looking for the cheapest way to get from France to Spain, travelling by bus from Paris to Madrid is one of your best options.
Eurolines is the main company that runs buses from the French capital to the Spanish capital. They operate coach services throughout Europe, and their buses are modern and comfortable.
Eurolines coaches leave Paris Gallieni bus station for Madrid South bus station up to twice a day at 14:30 and 18:00. Afternoon departures from Paris arrive in Madrid the following day at 7:00 in the morning, and evening departures arrive at 12:30 the following afternoon. Be sure to check schedules before you travel to confirm that there is a departure on the day you want to go to Spain.
The stated travel time to Madrid is between 16.5 to 18.5 hours, depending on which bus you take. The journey can be longer if there is traffic or if your coach does not depart on time. Delays are common, so make sure to account for that if you have onward travel plans when you arrive in Spain.
Fares for Eurolines buses from Paris to Madrid can be as low as 37 euros one-way if you buy coach tickets online at least a month before your travel date.