What is the difference between economy standard and economy flex?

According to Korean Air, the main difference between Standard and Flex is flexibility and benefits. Korean Air Economy Standard has multiple restrictions, like limited changes and no refunds, but it is cheaper than Economy Flex. However, the Flex class allows changes and cancellations with no extra cost, plus added benefits like earlier boarding. To Learn more about "Economy Standard vs Economy Flex Korean Air", visit the Airlines Group Travel Blog.