None. Allegiant Air has a $99 flight from Los Vegas. Other airlines include NW, Delta and United Express. No cheap flights.
It won't happen. The only major airlines that go to ND are United and NWA. Both of them charge MUCHO to come there b/c the demand isn't very high and so they have to make up their flight costs in that way.
I lived in ND for almost all my life until recently, and I can tell you that you'll find it hard to even get under 200 bucks one way...
I have to know which two airports your talking about first.
Don't where you are coming from but the simple answer is no. Airlines don't discount when going to North Dakota and it's not a high traffic state. So airlines don't have to discount.