So many people come here and ask "when is the best time to look for airfare" and like I always say it's just luck to snag a sale. Others say the perfect time is 2 months or 4 months or summer or winter. There's just no right or wrong answer. United just had a sale from my little home town in Tennessee to London and home from Barcelona in June 2019 for $650 - so of course we jumped on it.
I'm just saying...you've got to monitor every day and yes, it's a pain in the rear, and sometimes you'll get lucky. But for the newbie travelers - don't listen to people who tell you there's a "best" time to begin searching.