Oil prices have climbed sharply in recent weeks as mounting tension with Iran has raised the threat of a disruption in global supplies. That would drive up the gas price too! Southwest boosts fares by $10 per round trip If matched by other airlines, it would be the second airfare increase of the year. Last month, airlines raised fares by $10 each way on long flights. http://travel.usatoday.com/flights/story/2012-02-15/Southwest-boost-fares-by-10-per-round-trip/53107512/1