Originally Posted by Often1

A one word answer: No.

You were entitled to a refund of your ticket to your original form of payment. The $70 was a customer service gesture, not compensation. If you check the contract you agreed to when you purchased your ticket, you will see that you agreed not to seek consequential damages, e.g., the cost of the WN ticket.

Note that you did not have a connection in LAS because you were on separate tickets. Had you no showed for your LAS departure, you would have had to purchase a new ticket for your international flight as well.

It is possible that your travel insurance will cover the extra cash you had to pay to WN, but most policies do not. Nonetheless, worth reading your policy.