Plane ticket prices are depends on so many factors like departure/return dates, time of flying and so many things. If you are flexible in your travel dates than you have a chance to get a cheap air tickets and discounted air fare. You can search for the same on Globester.com as I did.
A person can buy plane tickets to travel to Spain from the airlines directly. One can also visit a travel agency to buy plane tickets. There are also numerous websites that sell plane tickets to Spain and other destinations.
the best way to travel to Spain is through a plane but to travel within Spain perhaps you should consider the train travel.
Travel websites
For international travel, sure.
A ticket (or other valid warrant or pass accepted in lieu of a ticket).
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Travel time to (by car) : spain(91 Hours) Travel time to (by plane) : (12 Hours)
From which city to where in Spain? You have not mentioned your flying dates & departure place so it would be difficult to give you the exact cost. Then also I can suggest one big name in travel industry Globester.com to book your plane tickets that match your requirements & suits your pocket.
Boat, train,or plane
stowaway
By the way Bus Ticket is cheaper than Plane ticket but both are the important in their places. Suppose that if you have a desire to go for long travel then plane reservation is good and if you have a desire for short travel then Bus reservation is best. So, it`s depend upon you what you want.
According to our friends at Expidia a return ticket cost starts at $1,187.00 and goes up. You have to make a minimum of one stop.