One way ticket?

[ReefHound]

That sounds reasonable right up to the point you are denied boarding by a gate agent.

That can be said about anything regarding rules. Like one way tickets.

 

[MMM]

I have had experiences either way. One time we were flying through (I think) Toronto then the U.S. and onto Mexico and the United agent insisted we have a return ticket. So we bought one on the spot. Other times we've gone down with one-way tickets. We usually stay a really long time and these days, airlines aren't posting their schedules too far in advance (at least in Canada). So we were unable to buy return tickets at the time we booked. I'll check again on the situation closer to our departure...

 

[Saxonjd]

By the way do they add an additional harassment fee for this?

If you add it in advance on their website it's WAY cheaper than paying for it at the ticket counter.