When your get a price, it should display the rules and identify what the particular airline policy is for weekend and weekday travel. It is generally less expensive to fly from major gateway cities. The price of flights decreases when you fly into major gateways. Atlanta ATL Dallas DFW Houston IAH Philadelphia PHL Seattle SEA Price depends upon seasons. Rates are based upon seasonality.
Prices increase in the high season, often to double what the low season price is.
High season is a very limited period of time, with some airlines only of a two week duration during peak travel times. At other times, and with other airlines a may last for 2 months. Shoulder season is in between High and Low season and is usually much cheaper.