I sort of discovered this myself when looking for flight prices about 4 months back around this week (flying from the US). I happen to have the whole week of Th

I sort of discovered this myself when looking for flight prices about 4 months back around this week (flying from the US). I happen to have the whole week of Thanksgiving off from work due to it shutting down that week every year (supposedly not guaranteed but has been given every year since instituted), so I was looking to take advantage of it to travel - I settled on the UK, but picking good days/times to fly was a challenge. I knew that generally early morning/late night flights were cheaper if I could get them in general, but one thing I noticed was flights were expensive the Saturday before to fly out, and expensive the Saturday and Sunday after Thanksgiving to fly back. I settled on flying out the Friday before Thanksgiving, and flying back on Black Friday for a savings of about $200-300. My flight to the UK though was completely full, in part owing that SFO is a major United hub whose employees take advantage of flying standby whenever they can. I’ll be a little surprised if it is full going back though.