When a flea is not feeding on a host, it can survive for a few days or months. However, in a warm, humid environment, it can live for months or longer. In order for fleas to survive, they need a warm host or warm bedding.
Fleas are a tough species. Depending on their environment and size, they can survive up to 2 weeks without blood. However, their survival time depends heavily on whether they are still feeding on human blood or if they are able to find other food in the environment. In addition, the newly emerged fleas are not dependent on human blood, so they can live much longer.
While there are a few factors that can influence flea survival, two main ones are temperature and humidity. Fleas are able to live for up to 15 days in 78 percent relative humidity and twelve days in 60 percent humidity. However, these are extreme conditions and are unlikely to occur in real life.
If a flea infestation is a serious problem, you should treat the infestation as soon as possible. Fleas can live on humans, furniture, and even other animals. You should avoid exposing your pets to fleas or their eggs, since they can spread from animal to human.