This is a common situation, and many people overpay simply because they don't know where to find reasonable fares. You should check out the options through a online flight search . This service really helps you find cheap flights, even if it's a popular destination like Frankfurt. There you can find the best options with layovers, which are sometimes half the price of direct flights. You can also see a flexible price calendar to immediately choose the most favorable departure and return dates. This is very convenient for business trips, as you can adjust to your work schedule. As a result, your additional payment will be minimal, and you will be able to keep more money for yourself rather than the airlines.