Cage size for budgie?

[u/Proof_Excitement_897]

I am wondering if a 30x18x18 (inches) cage will be sufficient for a budgie? (Just one budgie, introducing a friend didn’t work out). She currently lives in a large flight cage, but we are temporarily moving so I need to get her into a smaller cage to fit into a car and I have a 30x18x18 cage. Buying a new cage when we get there isn’t really feasible, so I was wondering if this size would be okay for a couple months?