Any guest who will book and pay for two consecutive nights at the 15 participating hotels from January 4 to February 28, 2010 will get a complimentary third night. Participating hotels include the Carlyle, Hotel Plaza Athenee, Loews Regency, London NYC, Mandarin Oriental, New York Palace, Peninsula New York, Pierre, Plaza, Ritz-Carlton, St. Regis, Sherry-Netherland, Surrey, Trum International Hotel & Tower and Waldorf Towers.

In addition, guests will receive a VIP shopping package from Saks Fifth Avenue. Package includes a personal shopping experience at the Fifth Avenue Club, discounts and complimentary coffee and dessert at the store’s Cafe SFA.

Rates at the London NYC, for example, start at $299 per night and taxes are 14.75 percent. Plus $3.50 per room per night.

This offer is valid on United’s select 3+nights vacation packages. You also need to book a reservation by May 31 to save on travel through October 31st.

To save, book using United’s promotional codes below:

1. $100 off with promotion code May100 on 3+night air/hotel vacations. Saves $50 per adult for a maximum of 2 adults. Spend minimum of $1,200 per reservation. Valid for Bellagio, MGM Grand, The Signature, Mandalay Bay, THEhotel, The Mirage, Wynn, Encore, Venetian, Palazzo, Trump and Four Seasons.

2. $60 off with promotion code May60 on 3+night air/hotel vacations. Saves $30 off per adult, maximum of 2 and minimum reservation spending of $1,100. Valid for Treasure Island-TI, Monte Carlo, New York-New York, Luxor, Caesars Palace, Planet Hollywood, Flamingo, Golden Nugget, Paris, Bally’s, Rio, Las Vegas Hilton, The Westin, Platinum, Palms, Hard Rock, and Loews Las Vegas.

3. $40 off with promotion code May40 on 3+night air/hotel vacations. $20 off per adult, maximum of 2 and minimum spending of $800. Valid for Excalibur, Circus Circus, Harrah’s, Riviera, Stratosphere, Fitzgerald’s, Four Queens, Hilton Grand Vacation Club, Hooters, El Cortez, andTuscany.