We find the best prices from SoCal out of LAX, often on non-stops. We have paid as little as $119 RT (all in, including taxes) and are genally happy with anything under than $300 all in.
I have also flown out of Nor Cal and tend to find the cheapest prices out of San Jose and Sacramento, but often find the same prices out of SFO or OAK. I have seen about $230 for flights last Fall out of SJC, all in and maybe $10 less out of SMF.
I find the best prices come and go and timign its everything. I set farewatchers with travelocity and anytime remotely interesting comes up, I look at all possible days and options. If I am travelling on a route I don't fly often, farecast under the travel section of bing.com gives me an idea of historical prices.
I haven't flown in June, but often find that I have to wait until August to get the best deals for travel in the Fall. -- Suzanne