Methods and systems for efficiently increasing the wing area of an aircraft are disclosed herein. An integrated wingtip extension configured in accordance with one embodiment of the invention includes a tapered wing section and a winglet. The tapered wing section includes an inboard end portion having a first chord length and an outboard end portion having a second chord length that is less than the first chord length. The winglet is fixedly attached to the outboard end portion. The inboard end portion is configured to be fixedly attached to a tip portion of an aircraft wing. In one embodiment, the tapered wing section and the winglet can be integrally formed from composite materials.