How long takes to travel to spain from the usa?

Depends where exactly. There are nonstop daily flights from New York (JFK and Newark), Chicago, DC (Dulles), Philadelphia, Atlanta, Miami, and Boston, mostly to Madrid and a couple to Barcelona.

The shortest scheduled flight duration is Boston-Madrid at 7h, 0m on American.
JFK-MAD scheduled for 7h, 15m on Iberia
Newark-MAD 7h, 15m Continental
Dulles-MAD 7h, 20m Iberia
PHL-MAD 7h, 20m USAir
MIA-MAD 8h, 10m American (8h, 20m American)
CHI-MAD 7h, 55m Iberia
ATL-MAD 8h, 20m Delta
JFK-BCN 7h, 45m Delta
Newark-BCN 7h, 50m Continental

So... if you've got a nonstop flight from the USA to Spain--just as you asked--then expect flight duration to be between 7 hours and 8 hours and 20 minutes--depending on where you're starting and where you're headed. If you need to connect, then of course it will take longer.

It took Columbus 3 months.

A flight from New York (JFK) to Barcelona takes 7 hours 50 minutes.

where in the US to where in Spain...

a few of the timings are:

IAD W'ton DC to POS port of spain/trinidad
american airlines .... 1 stop.... 17 hours

W'ton DC (IAD) to POS
american airlines ... 1 stop.... 7 hours...

depends on the date and time of travel and the duration of your stop over.....

check for deals on www.kayak.com
with different dates and timings....

Have a safe trip

Where in the US..not enough info...