Through the 2017 season, the franchise has finished with a losing record in 28 of 41 seasons. The Mariners are one of seven Major League Baseball teams who have never won a World Series championship, and one of two (along with the Washington Nationals) never to have played in a World Series. With the National Football League's Buffalo Bills ending their 17-year playoff drought on December 31, 2017, the Mariners now hold the longest playoff drought in all of the four major North American professional sports, having not qualified for the playoffs since 2001.

Is it true that have the seattle mariners been to the world series?
no