Stupid question, is there an equivalent of

prefect run

in Orion? Or do you have to run flows with

python flow.py

?

Afaik, not yet, but it may be added later. For now, you can run it as script as you suggested, or run it in iPython. There's also an option to create and run a deployment:

prefect deployment run deployment_name/flow_name

Yeah for local execution it would just be

python myflow.py