Ever hear for skiplagged? Basically the concept is that you want to go from city A to city B but flights from A to B are super expensive, but Skiplagged.com will find you a cheaper flight from city A to C with a stopover in B. So when you get off the plane at city B you just walk off your flight and "forget" city C. There are a few pitfalls to this like you can't do it if you're checking your luggage and if the airline redirects your flight due to delays or stuff they're only obligated to get you to city C not city B. However, I find it works really well for short business trips that are booked the same week of the trip when you know the weather is okay and the chances of delays or cancellations are slim to none.
