Domestic Airline suggestion?

Looking for a flight to Gretna, LA (I think it's right by New Orleans) from Seattle, WA. Anyone have an idea how much this should cost (1) on average, (2) to be considered cheap? Which airliner do you suggest? Which source should I book from/do research with? Googling returns a terrifying amount of... advertisement that it's made me both a bit weary and wary.

Only priority: low price. Not much care for (dis)comfort, wait, long stay, etc.

Cheapest I could find:

1st trip: $329 + tax per person
2nd trip: $297 + tax per person

Round trip? One way? Dates?

Regardless, with any reasonable-ness with dates, I couldn't find anything cheaper than yours, but many at the same price or very near to it.