Travelers at JFK Airport still faced delays Monday, a day after a water main break wreaked havoc and forced evacuations at the arrival terminals — while officials vowed to “hold all responsible parties accountable.”

“There may be delays at #JFK. Please allow extra time and contact your airline,” the airport said in an 11:18 a.m. tweet warning fliers of residual delays after Sunday’s chaos.

It was the third identical warning the airport sent on Twitter.

“Same tweet for the last 10 hours. It’s simple is terminal 4 accepting inbound flights yet,” @Pulido_Alvin posted exasperatingly in response.

The airport was experiencing departure delays averaging about half an hour, according to the website FlightAware.

The massive water main break at Terminal 4 sparked a travel nightmare and resulted in an evacuation after about 3 inches of water flooded the privately run terminal.

The Port Authority of New York and New Jersey said it is investigating why a water pipe that feeds a sprinkler system broke — and promised to “hold all those responsible accountable.”

PA chief Rick Cotton said investigators want to determine “why an internal pipe was not weather protected and whether any other failures contributed to this disruption.”

“The Port Authority is committed to providing the highest caliber of service to all travelers and we will hold those responsible accountable for any shortcomings we find,” the executive director said.

“What happened at JFK Airport is unacceptable, and travelers expect and deserve better,” Cotton said about the 2 p.m. water pipe break, adding that it appeared to be weather-related.

Frustrated passengers on Sunday were forced to abandon their luggage and flee after the flood caused a power and heat outage.

Luggage was still sitting unclaimed at Terminal 4 on Monday as travelers aired their grievances to the airport on Twitter.

“What are you doing about baggage?!! We were told to leave the airport yesterday without ours,” flier Lucy Wilkinson fumed in a tweet Monday.

“We have no clothes for our trip and the temperatures here are well below freezing. We need our belongings. Why is there not a team of people working their asses off to sort this??”

To add to the misery, Thursday’s “bomb cyclone” shut down JFK and LaGuardia airports for part of the day Thursday and more than 1,000 flights were canceled.

“We are still without luggage and it’s been 4 days,” another traveler, Sharon Moncrieff, tweeted.

“No answers from anyone. Stuck in this hotel with nothing. I just want to go home, our once in a lifetime trip is ruined,” she told The Post in a tweet.

“I have just called baggage and they say they have a backlog of at least 1000 bags. It will be days before we can get ours. So we won’t get it all while we are here.”

Another Twitter user, @sasuraiger, wrote: “I’m in a customs line after a 14 hour international flight and there is one person checking people, one at a time.”

In a statement released before the water pipe break, the Port Authority said Saturday’s cold “created a cascading series of issues for the airlines and terminal operators.”

“These included frozen equipment breakdowns, difficulties in baggage handling, staff shortages and heavier than typical passenger loads,” it said.

Additional reporting by Yaron Steinbuch