Besides these websites make sure to sign up for the air carrier's newsletters as they do, do flash sales a few times a year with different locations and you'll only be able to access them by using the code in the email. On top that, sometimes airlines release the wrong price if someone is too quick to hit send on these emails. While airlines (at least in Canada) do have the right to cancel the ticket and refund you what you paid there are some that have honored the price as it's great PR.
Another way that might help is the Gopher extension for Chrome & Internet Explorer as it will "dig" up any deals / discounts from that site.
Please note that all sites are accurate at time of posting and updated by the airlines themselves and promotions can be changed at anytime due to the airlines laws. This page is for information service only and Female Abroad is not in partnership nor makes money from any of the listed airlines.
