After entering your destination and date of travel, you can sort your results by price, as well as filter by preferred departure and arrival times, airlines and more. The cheapest one-way flight from Taipei (TSA-Songshan) was to Seoul (GMP) at S$474. These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply. A smart way to land a cheap flight is to be flexible with your dates. Start by searching for flights on your preferred dates, then click on "Flexible dates" above the results. This will reveal the lowest prices for the days surrounding your trip. You can also refine your search and filter for airline preference, specific departure and arrival times, nonstop flights and more.