MKE is probably the cheapest you'll find. I found a same day return on Dec 26 for 106.50 incl tax roundtrip. If you would like more miles, you can fly to the west coast for about 168 incl. tax.

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When once you have experienced being a 1K, you will forever fly the friendly skies with your eyes set on 100% mileage bonus and SWUs, for there you have been, and there you will always long to return, every year!