Passengers at La Guardia are being hit with an apocalyptic swarm of mosquitoes feasting on their flesh as they dash to make their flights at one of the nation’s busiest airports.

“I pay too much money for a flight to have little critters coming at me once I’m inside the airport,” said Franchesca Lewis, 29, from Long Island, swatting away bugs as she waited for her bags.

Skeeters have always been bad at La Guardia, but some believe that the airport’s massive, $4 billion reconstruction has led to an even bigger and more aggressive insect population this year.

“I never saw it like this before,” said a La Guardia security guard who declined to give his name. “It’s pretty gross. I swatted away 10 flies in just one hour. I think it’s all the construction.”

Workers stationed inside and outside the airport say they are constantly under siege.

“For my whole shift, I’m swatting them away,” said baggage handler Sade Williams, who works in Terminal B. “I’ve already been bit once today.”

The work at La Guardia has caused other problems, too. Traffic has long been terrible but now it’s so bad on some days that travelers have to get out of cabs and Ubers on the Grand Central Parkway and walk from the highway to avoid missing flights.

Mosquitoes are not a bigger problem across the city this year, however, said Julien Martinez, spokesman for the city Health Department. But La Guardia’s combination of construction and its waterfront location is likely causing the uptick.

“It’s located right by the water, right by the bay, it’s getting warmer and it’s been raining and humid,” said Martinez.

The mosquitoes at La Guardia could be any of the more than 50 species of the pest that live and thrive in New York City, said Martinez.

None of the city mosquitoes are known for carrying Zika, the dangerous virus that has caused sickness in adults and birth defects in babies. Still, the Health Department recommends that people wear long sleeves and pants when they are in mosquito-prone areas, and use bug repellent.

La Guardia Gateway Partners, which operates Terminal B, blamed the rainy spring and says it has brought in exterminators.

The developers say they’ve installed “bug zappers in several back-of-house locations” and are “power-washing and deep-cleaning the loading-dock area; and eliminating standing water in ­areas within the terminal.”

Additional reporting by Shari Logan