I was looking at booking some tickets from EWR to MCO. I was looking to leave on a Wed. evening and return on a Sunday. When I first went to book I accidently put in returning on a Monday and got a price around $159 on the outbound. When I corrected the day to returning on a Sunday, the outbound price changed to $181. Anyone have any idea why the outbound prices would be affected by the return day?? I am guessing the pricing per leg is based on the entire itinerary on not priced individually?

Thanks.