Does anyone know of a reliable third party site to book international flights? I live in Spain and I want to go to China. I've seen good flights on 'eDreams' and 'Travelpack' but both sites have bad reviews online. I tried to book direct with the airline, but because it's two different airlines, I couldn't do it as one booking. Any idea?

In Europe, www.skyscanner.com Internationally, www.kayak.com consolidates many different agencies and airline sites. www.vayama.com
www.orbitz.com
www.hipmunk.com
www.cheapoair.com are sites I watch regularly. www.itasoftware.com provides data to many airlines and can be used to check possibilities although it does not sell tickets. Google now owns the operation.
There are many others. The only feedback on their reliability arises from something going wrong. The amount of personal service you can expect as a remote customer in times of trouble is not huge. If you want that kind of attention you should book through a full-service travel agent in person.

I have booked through ebookers.com, vayama.com, cheapoair.com, and expedia.com and had good experiences with each. After booking, I always confirm immediately with the specific airline and am usually able to reserve a seat right away.

Yeah, SkyScanner and Kayak both of these sites are very reliable.

Travelocity have global sites and so does Expedia. Just click on the Spanish flag to take you to your country site.

Why not go to a local travel agent and have the booking done properly rather than take a chance on an automaton with limited customer service?

There aren't any travel agents around here that I know of, but perhaps I just haven't noticed them. Are travel agents much more expensive than online sites?

They may be $20 or so more expensive but they will handle a multi-airline ticket a lot better to ensure as easy a trip as possible.

I have recently used www.lastminute.com and www.travelstreet.co.uk both are great if you fly from UK

Ill second Kayak for economy deals. If you want to fly business class, use these guys www.letsflycheaper.com They have better deals in that regards then Orbitz or Kayak.