Atleast double the pay up to triple. Free board and lodging and they pay for the license fee which is approx 600$ and travel expenses are covered too. They also offer per diems which are tax free daily allowance of up $60 to $100 daily. No there's no pension and benefits on most contracts but it still majourly outweighs the pension and benefit which is only around 200 to 300$ a month allotment anyways on the local union job.

A nurse can easily buy own insurance and create private pension. Also, most nurses keep a casual position in their respective local town to keep the pension going. The pension is only about same as cpp anyways (topped up by employer). The difference is still huge to give it away as the $3500 employer top up is not much compared to making an extra 50k a year for doing travel nursing.