A lifetime New Yorker, Katie Minton, 30, chuckled as she reminisced about planning her sister’s bachelorette party seven years ago, a limo chauffeured night out in the city.

Mrs. Minton, an advertising sales representative and soon-to-be graduate student at the Wharton School of the University of Pennsylvania, won’t spend an evening bar-hopping for any of her close friends’ bachelorette parties this year. She will fly to Palm Beach for a long weekend, spend a few days being pampered with spa treatments in the Hamptons, and chip in for dinner at an expensive city restaurant followed by bottle service and a private table at a swanky night club.

“Everybody has elaborate expectations,” she said. “Bachelorette parties are a full weekend. It’s no longer a night out.”

Taking a minute to calculate, Mrs. Minton said she spends about $800 on each bachelorette party she attends.

Destination weddings have spiked in popularity over the past 10 years, one of the city’s top wedding and party planners, Marcy Blum, said. But now, many 30-something New Yorkers, like Mrs. Minton, are facing the extra financial burden of elaborate bachelor and bachelorette parties.

Ms. Blum said the parties are becoming more spectacular because soon-to-be newlyweds are treating the celebration as a bonding experience rather than a last hurrah.

“It’s telling that many of the parties aren’t about strippers,” she said. “The grooms are inviting their bride’s brothers and fathers.”

In a recent 10-day span, a program director at an international adventure travel company, Brian Difeo, went camping and kayaking in Puerto Rico for one bachelor party, returned home to spend a quick evening with his fiancée on the Upper West Side, and then flew to Telluride, Colo., for a full week of bachelor festivities.

Mr. Difeo, 29, was sufficiently liquid to afford the nearly $2,000 he spent at the bachelor parties, but he will dip into his savings this summer to lay out about $8,000 to attend five weddings, including one at a chateau in Lyon, France, and another at Harbour Island in the Bahamas.

Tad Hutcheson, the vice president of marketing and sales for Air-Tran Airways, which markets ticket discounts geared toward bachelor parties, said Las Vegas is still the hottest destination for the events, but New Orleans, Miami, and Fort Lauderdale aren’t far behind.

AirTran’s group ticket discount program, called “event savers,” ties a custom code to each bachelor party. The code can be included in an invitation, giving partygoers, who are often spread out across the country, the flexibility to fly from different airports, Mr. Hutcheson said.

As such parties evolve into multiday events, budgeting free time becomes an essential and at times difficult part of the equation, a child psychologist, Emily Israel, said.

Last year, Ms. Israel, 28, attended 15 bachelorette parties, hosting eight of them in the city for friends from her alma mater, Middlebury College. With invitations to about 10 weddings and bachelorette parties this season, she said she might attend only five.

“I’ve been trying to cut back,” she said.

Ms. Blum said that although Las Vegas and spas such as Canyon Ranch in Tucson, Ariz., are still havens for bachelor and bachelorette parties, many New Yorkers are planning the events at more intimate locales such as family homes in the Hamptons or at private venues in the city.

Planners clamor to host wedding events at for-rent lofts such as the 11,000-square-foot Sky Studio in Greenwich Village and Peter White Studios in Chelsea, Ms. Blum said.

One of the hottest spots for bachelorette parties in the city, she said, is the Champagne Lounge in Murray Hill, which has panoramic views of Madison Avenue. A 40-person tasting matched with hors d’oeuvres in the lounge starts at $5,400, the owner, Margaret Zakarian, said.

A financial adviser and experienced bachelor party attendee, Jeffrey Wylde, 34, said he plans to attend bachelor parties in Las Vegas, Montreal, and Atlantic City this summer. On average, he spends about six times more money on destination bachelor parties than their corresponding weddings, he said.

The average age of the American bride is 25, while bridegrooms are 27 on average, according to the National Association of Wedding Ministers. But New Yorkers generally tie the knot a little later in life, Ms. Blum said, so they have more professional experience and more disposable income for wedding events.

But the art of the inexpensive bachelorette party is not dead, especially for amateur party planners like Kimberly Roosenberg.

A production manager at a nonprofit organization, Ms. Roosenberg, 25, planned her college roommate’s bachelorette party last month. It was the first she had ever attended.

The all-day event started with brunch in the West Village, followed by a pottery session at a nearby studio. The evening ended at a bar in the East Village, where the bride-to-be partied the night away wearing a wedding veil. The entire celebration cost about $250 a person.