Originally Posted by
denCSA
For example, I've noticed UA selling extremely cheap F fares lately, such as $199 all-in for DEN-SEA one-way, while the cheapest Y fare is $109. I've seen similar cases with DL too. This is in contrast to 5 years ago where F class fares were out of reach for most of the traveling public (4-5x as much as a Y ticket).
That all depends on route. Just bought AA from MIA-SFO for about the same as UA wanted for Y. AA has non-stop and UA doesn't and UA didn't have upgrade space and wanted 2x as much for F with a stop versus AA on the non-stop.