Delta Air Lines Inc. is adding more nonstop flights out of Seattle as it continues to invest in its growing Pacific Northwest network.

Atlanta-based Delta will add a second daily nonstop flight from Seattle-Tacoma International Airport to Austin, Texas, beginning Oct. 1.

Delta is also adding nonstop service from Seattle to Medford, Oregon, beginning Oct. 1.

Medford is Delta’s ninth Pacific Northwest destination from Seattle, complementing recently added Oregon flights to Eugene and Redmond.

The…