Last day United MileagePlus members can earn double elite-qualifying and award miles on flights between Chicago and Los Angeles, Orange County or San Francisco. Register at http://www.insideflyer.com/link/?5550
Last day National Emerald Club members can earn a free car rental after completing two qualifying rentals. You can also refer someone else and receive a free rental day if your referral signs up and completes a rental by Jan. 31, 2012.
Last day VOILA Hotel Rewards members can earn between 2,500 and 10,000 bonus points for hotel stays.
Last day to receive a 30 percent point bonus when transferring American Express Membership Rewards points to Avios points.
Last day to redeem Gold Points for a stay of one or more consecutive nights at participating Club Carlson hotels and receive a 9,000-point rebate. Earn the rebate on up to five award stays for a maximum rebate of 45,000 points. Register at http://www.insideflyer.com/link/?5664
Last day Wyndham Rewards members can earn 6,500 bonus points or 1,000 bonus miles or rail points for every two stays booked at qualifying rates. Register at http://www.wyndhamrewards.com/giftme5