Do you know if award travel is refundable (you get the points back) on United like it is on Southwest?
I suspect United is similar to American Airlines when it comes to redepositing miles. This is AA's policy:
Reinstating Award Tickets
(Waived for AAdvantage Executive Platinum members using miles from their account)
You can request to have your AAdvantage mileage reinstated for an unused AAdvantage flight award if your ticket has not expired. Partially used awards cannot be reinstated.
When requesting a reinstatement, a $150 USD processing charge will be assessed per account for the first award ticket. Any additional award tickets reinstated to the same account at the same time will have a $25 USD per ticket add-on charge.