Originally Posted by WineCountryUA

Just did another check and there is immediate upgrade space R4 on UA351 Oct 1, 2012. R3 on SFO-LIH UA 361 Oct 1, 2012 {had the direction backwards} But is F5 out of 24F. So Miles + $$$ would clear on application. Also means mostly likely there is no one else waitlisted for a mileage upgrade. Surprised there is no buy-up offer in this situation.

Originally Posted by escapefromphl

You could try calling up and seeing what the difference is to buy up to F, they should be able to waive the change fee. Not a cheap option but better than buying the miles.

Checking on the website once or twice a day right up until departure is probably a good idea.