Originally Posted by xyzzy
channa is correct. You will almost certainly not get the best price if you purchase 330 days out. Regarding booking two one-way tickets, that depends on whether the fare you are purchasing requires a round-trip purchase. If it does, then two one-way tickets will cost more.
I am getting I-class 330 days out into EWR - you have to plug the dates in manually (not click on the site calendar). The seat map does not come up until 323 days out.