From abc news:
Vanessa Regan from Tiger Airways says there was not enough demand for the flights.
But she says Tiger is not pulling out of Darwin completely.
"This is kind of common business practice for all airlines at the moment," she said.
"I think you'll find a number of airlines are adapting their schedule for that period."
Ms Regan says all passengers who made bookings during the affected period will be offered a full refund.
She says she hopes Territorians will understand Tiger's decision.
"It is a commercial reality that we do operate on the most profitable routes.
"So we don't go into a market with the intention to pull out and suspend.
"We want to continue, we want to ramp up services.
"So, it is based on demand, we have to have full planes to continue to offer such low fares."
Tiger Airways pulled out of Darwin in October 2008 and only returned in June.
Meanwhile, Jetstar has launched a new service between Darwin and the Philippines.
Flights to Manilla will begin in February next year.