UPDATE (5:10pm CT, Nov. 19): Due to the popularity of this offer, the Luxor Las Vegas is now $54 more per person, Treasure Island is now included as an upgrade for an additional $117 per person and many other hotel options are available.

Travel through January to take advantage of the latest Las Vegas vacation sale from Southwest Airlines Vacations. With this offer, packages to Sin City start at $46 per person, per night. With prices like this, put together a 3-night getaway on The Strip including roundtrip air for as little as $138 per person.

The best sale prices are valid for stays at the Riviera Hotel & Casino with Monday departures. Weekends are also discounted. With Southwest, travelers can check up to two bags per person for free.

Here are just a few sample prices from more than 50 cities across the U.S.:

• Los Angeles, Burbank or Orange County … $138
• Phoenix ... $144
• Reno ... $144
• Sacramento ... $189
• Albuquerque ... $216
• Portland ... $234
• Amarillo ... $234
• Indianapolis ... $243
• Cleveland ... $243
• Lubbock ... $246
• Chicago ... $270
• St. Louis ... $276
• And many more Southwest Airlines gateways

Upgrade options include 4-star accommodations at Luxor Las Vegas for $51 more per person or Planet Hollywood Resort & Casino for an additional $90 per person.

Book by Nov. 26: Click here to book online and for more information on additional cities and hotel options. The final price will include $30-$60 in taxes and fees. Note: The above pricing was found for Monday departures the following dates: Riviera Hotel Dec. 7-14 and Jan. 4-18, and Planet Hollywood Nov. 23-Dec. 21.

Bonus: This is part of a larger Southwest Airlines Vacations sale that features vacation packages to destinations across the country, including Friends Fly, Stay and Ski Free packages, and Walt Disney World vacations with park ticket discounts and $200 in additional savings. For more information, click here.