Spirit Airlines announced Thursday it would begin flying twice a day to and from Seattle-Tacoma International Airport starting April 14. On the same day, Allegiant Air announced it would begin linking Las Vegas with Oklahoma City, St. Louis and San Antonio.

Allegiant says its nonstop flights will be available twice a week starting Nov. 5 from Oklahoma City and St. Louis and Nov. 6 from San Antonio.

With the addition of Seattle, Spirit now offers nonstop flights to 19 destinations from McCarran International Airport in Las Vegas.

Allegiant is based in Las Vegas and offers nonstop flights to 52 destinations.