I have no tips besides checking regularly back for fares.. but having moved to North Dakota I can for sure relate!
Fun thing:
I can fly from DIK to ASE (128+500 miles) for around $480,--...there were recently deals for fall travel DIK to MUC (~7000 miles) available for 490 Dollars.
My option is to drive 2 hours to Bismarck, from there flights are usually around 100 dollars cheaper.
Also interesting: It is around 100 dollars more expensive to fly from Europe to the US than other way around, usually I pay less to fly from Europe to the US.