The cheapest seats on an Airbus A300 are in the economy class section, but the actual price depends on availability and whether the traveler is flying mid-week or on the weekend. Airline seat prices are also based on low, mid and high travel seasons and length of stay.
Airlines practice tier pricing. In economy class, there can be as many as 10 different prices for the same seat. Airlines sell a certain number of seats at the lowest price, then that fare is no longer available. The next client gets the next lowest price. This pattern continues until the seats are sold out. By booking early, staying at least two nights and flying mid-week during low season, a lucky traveler can get the cheapest available seat.