Through Dec. 20, 2014, United MileagePlus members can earn 1,000 bonus miles per night when staying at participating Waldorf Astoria Hotels & Resorts and Conrad Hotels & Resorts, both Hilton HHonors hotel groups. There are more than 50 locations where you can earn the bonus miles including Waldorf Astoria Beijing and Conrad Hong Kong.

To be eligible for the bonus, you must register for the bonus before your first stay and select United MileagePlus as your preferred Double Dip Points and Miles partner in your HHonors profile. The bonus offer maxes out at 5,000 bonus miles per stay (a five-night stay). Allow six to eight weeks for the miles to show up in your account. Visit http://insideflyerus.wpengine.com/link/?11768 to learn more.

Bottom line: This offer may be combined with other offers or promotions, like the Best of Waldorf Astoria Experience offer where you can get $50 to use at the hotel every night of your stay (or 50 euros in Europe or 50 pounds in the U.K.). You can access more information about this offer at http://insideflyerus.wpengine.com/link/?11767