Originally Posted by Greg76248

I am looking at a RT DFW-LHR either 2/18 - 2/23 or 2/22 - 2/26. The fares for the earlier time are about $300 each way before taxes. However, the fares for the second set of dates the outbound alone is over $1000! It seems only B and higher fares are available. Seat maps look wide open, and MilesAAver awards are available on practically all the flights. Why are the fares so high starting on 2/21?