I checked flights from IAD to RCO for the beginning of September and last week and they were over $1100.00. I checked again yesterday and they were $670.00. I purchased the tickets at the lower price.

Yesterday I checked prices for IAD to LHR in May and the prices were $490.00 and today they’re close to $800.00.

Did I miss a sale that was only a day long? Why such a variation from day to day?