Their performance is actually quite superb, and a fully-laden 195 has a range of approx 2500 miles from SOU
Not sure where they got that one from... ERJ-195 published figures show 1,400nm range with max passengers at long range cruise speed, 1,800nm for the 'LR' version.
Have Flybe gone for the LR? If so SOU-TFS is (just) within range, runway permitting.