Save up to 35 percent on Antarctica cruises, and other travel bargains

This week’s best travel bargains around the globe.

For its 15th anniversary, the Hotel Commonwealth in Boston is reducing the second night of a two-night stay. The first night starts at $225, and the second night costs $15. Add 14 percent for taxes. Book from 11 a.m. to 5:15 p.m. on May 15. Available on select dates through Dec. 30. Info: 617-532-5019, hotelcommonwealth.com.

The Cultural Council of Palm Beach County and Discover The Palm Beaches in Florida have teamed up to launch the MOSAIC promotion in May. The Month of Shows, Art, Ideas and Culture features special offers at cultural venues and hotels in the county. For example, receive $5 off admission to the Palm Beach Zoo (normally $16.95-$22.95) and free nights at the Breakers Palm Beach (free sixth night), Delray Sands Resort (free third night) and the Boca Raton Resort Club and Eau Palm Beach Resort Spa (free fourth night at both properties). Info: palmbeachculture.com/mosaic.

Omni Hotels Resorts has a summer sale at 47 North American properties. The sale applies to hotels and resorts in 19 states, plus the District, Montreal and Toronto. Rates vary. For example, a deluxe king room at the Omni Interlocken Hotel near Denver starts at about $192 a night in mid-June, including tax — a savings of about $37. Book by April 30; stay through Sept. 30. Info: 888-444-6664, omnihotels.com/specials/summer-sale.

With Peregrine Adventures, save up to 35 percent on Antarctic voyages departing November through March. For example, the 10-night Photography Series: Antarctic Explorer cruise, which sails round trip from Ushuaia, Argentina, on Nov. 13, starts at $6,227 per person double, a savings of $2,668. Price includes one night’s hotel in Ushuaia, nine nights aboard the 132-passenger Ocean Adventurer, most meals, excursions via Zodiac boat, and taxes. Book by April 30. Info: 855-832-4859, peregrineadventures.com/en-us/antarctica-earlybird.

Avianca has sale fares from Washington Dulles to Brazil. For example, the round-trip fare to Rio de Janeiro starts at $799, including taxes. Other airlines charge from $919. Travel through Sept. 27. Discounted fares are not available on flights departing June 28-July 16 and returning July 4-5 and Aug. 17-Sept. 4. Book by April 30 at avianca.com.

United has a sale on flights from Washington Dulles to several U.S. destinations, including Indianapolis, Atlanta and Portland, Maine. For example, nonstop air to Raleigh, N.C., starts at $183 round trip for Basic Economy (several restrictions apply) and $192 for Economy. Taxes included. Book by May 3. Travel Tuesdays, Wednesdays and Saturdays, May 8-June 13. Holiday blackout dates apply. Other airlines are matching in some markets. Info. united.com.

Apple Vacations has a Summer Fun for Everyone sale to a ll-inclusive resorts in the Caribbean. For example, a six-night package to Punta Cana in the Dominican Republic starts at $899 per person double and includes nonstop flights from BWI Marshall, a junior suite at the Grand Palladium Bavaro Resort, all meals and drinks, nonmotorized watersports and taxes. Depart June 3. Priced separately, the trip costs $1,369. Travel dates vary by resort. Book by May 3. Info: 800-517-2000, applevacations.com/summer-vacation-deals.

Carol Sottili, Andrea Sachs

Prices were verified at press time Thursday, but deals sell out and availability is not guaranteed. Some restrictions may apply.