Service to be added/expanded to Tri-Cities; Boston; Bozeman, Mont.; and Victoria, B.C., amid Delta’s fierce competition with Alaska Airlines.

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Delta is adding new destinations and increasing flights out of Seattle, once again upping its competition with Alaska Airlines.

Delta announced Monday it will add service from Sea-Tac Airport to Pasco, Wash.; Boston and Victoria, B.C. (subject to Canadian government approval). It also will expand its service to Bozeman, Mont.

Here’s the word from Delta on the new year-round service:

• One daily flight to Boston’s Logan International Airport beginning April 4, 2016.

• One daily flight to Orlando International Airport beginning Dec. 19, 2015.

• Three daily flights to Tri-Cities Airport in Pasco beginning Nov. 1, 2015.

• Three daily flights to Victoria International Airport beginning April 4, 2016.

• One daily flight to Bozeman Yellowstone International Airport beginning Aug. 1, 2015, expanded from Saturday-only seasonal service.

Delta also has started/expanded flights to Alaskan destinations — on Alaska Airlines’ traditional home turf — including Ketchikan, Sitka, Juneau and Fairbanks. The airline will begin flights to Denver on June 4 and to Hawaii’s Big Island in December.