Are you specifically looking for freighter ships, or will any ship do? Cruises from certain cities during certain parts of the year can be incredibly cheap — often cheaper than flying, if you go with another person. CruiseSheet is a good way to find these, though keep in mind that the prices are per-person and that you also need to factor in taxes (usually not too bad) and tips (something like $12-$15 a day). It might not be as romantic as heading out into the unknown on a rusty cargo bucket, but it’s darn comfortable and they feed you really well!
I have been wondering about that as well and here is what I could find.
I read about trips with several major container ship operators (CMA-CGM, Hanjin Shipping, MSC, NSB) plus some roros and Polish bulkers. I also found many agencies selling more-or-less the same trips (a few in Germany, one each in France, the US, Australia and the UK). In all cases, the prices were around EUR 80-110 per day, plus deviation insurance and embarkation fees (which are more-or-less fixed costs, so they weigh much more heavily on short journeys).
Those are the only companies I have heard of that verifiably take passengers on a regular basis and they all have pretty similar prices/conditions. Thus any trip across the Atlantic or Pacific, to or from Asia or Oceania or through the Suez canal will cost at least €2000-3000, sometimes much more and circumnavigations start at €10,000.
Consequently, it seems the price does not depend so much on the ship, the agency or the operator but mostly on the route/length of the voyage. At EUR 100 per day, ocean crossings or longer journeys will always cost a few thousands euros/dollars. Voyages to or from Australia and New Zealand also seem in particularly high demand.
The only other option seems to be shorter “partial” journeys, hopping on and off a ship doing a longer rotation. Nothing dirt cheap and certainly nothing cheaper than a commercial flight but still some opportunities to travel on a freighter for less than EUR 900/USD 1000. Some examples:
From what I can tell, some agencies are a little more reluctant to sell short trips than others but it seems that it’s often possible to book a partial journey on a given freighter line. So you could also check the longer journeys on all the websites listed here and then approach an agency to enquire about a specific trip, even it’s not listed explicitly.
It is not a freigther, but if you consider a yacht also a valuable way of sea transport, you can get some valuable advice at: http://wikitravel.org/en/Hitchhiking_boats
. On this nice reading article, I found a link to http://www.findacrew.net.
Good luck!
Credit:stackoverflow.com‘