In 2024 Gwynne Shotwell said Starlink had a $600 million positive free cash flow based on $8.2 billion in revenue. Last year revenue estimates from both SpaceX and from outside people adding up new military contracts came out to about $11.8 billion. Their fixed costs haven't gone up much, so the big unknown is development costs for military contracts. I think $2 billion is a reasonable, conservative estimate.

There's a few ways

They're prepping for an IPO and there have been some anonymous insider reports of the figures in the press

There are industry estimates

Much of their income comes from public contracts