When you call MTS with your travel plans, we will quote you a fare based on your requirements. No routing changes. No refund of the ticket for cash. Fees for changing a ticket. Application of any voucher on the carrier if you must change or cancel your plans.
Nonrefundable fares are significantly less expensive than full-fare coach.
If you can purchase your ticket ahead and abide by the stay restrictions, you'll save a lot of money. Only you know if you're likely to use the ticket later if you must cancel. If so, it may be worth purchasing the nonrefundable ticket and be penalized, providing you apply it to a future itinerary. Taking advantage of promotional and sale fares requires some advance planning. An itinerary must meet conditions to qualify.