There are several ways, many of which have already been posted on these forums.
If you have access to your own airlines' CRS, an availability display will give a little insight. If you zero's, that's a good indication it's full. Another way is to visit the airlines' website and attempt to purchase
seats, generally the maximum you can purchase without it becoming a group reservations is 9. If it allows you 9 seats, that's a good indication it's open.
Of course, these will only give you a rough idea. You will have no insight into the other airlines' over booking profile for a particular flight - A flight from A - B may already be sold to capacity, but the airline has permitted sales beyond that level.
The best way is to contact the airline directly or place a request here under the forum heading Loads.
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