SEATTLE — Alaska Airlines will chart new territory this fall when it adds new service between Los Angeles and Costa Rica’s two major international airports, further strengthening its southern California focus city. The eight weekly flights from Los Angeles to San Jose (SJO) and Liberia/Guanacaste (LIR), Costa Rica, are scheduled to begin Oct. 31 and Nov. 1 respectively, and are in addition to new daily service the carrier will add on Sept. 9 between Los Angeles and Baltimore.

Liberia is the gateway to the Guanacaste region in the western part of the country, renowned for surfing and sport fishing. While the capital city of San Jose, located about 130 miles from Liberia, boasts museums and historic Spanish colonial architecture. On the blog: Read an Insider’s Guide to Costa Rica.

“As the most popular Central American tourist destination for U.S. travelers, Costa Rica is a mecca for eco-tourism, surfing and sport fishing and has been a top request from our customers who enjoy outdoor adventure,” said John Kirby, Alaska Airlines’ vice president of capacity planning. “Our new Costa Rica flights are well timed for Los Angeles travelers and offer convenient roundtrip connections for our Anchorage and Seattle customers, while our new Baltimore service provides passengers greater access to the nation’s capital, complementing our daily nonstop service to Reagan National Airport.”

To inaugurate the new service, Alaska Airlines is offering introductory one-way fares of $149 between Baltimore and Los Angeles.* Customers must purchase their tickets by May 6 and travel by Nov.18. Visit www.alaskaair.com to find great savings and purchase tickets, or call 1-800-ALASKAAIR (800-252-7522 or Hearing & Speech Impaired (TTY): Dial 711 for Relay Services). Flights will be available for purchase for the new Costa Rica routes starting May 21, pending approval by Costa Rican civil aviation authorities.

The airline is also offering members of its Mileage Plan double miles on flights between Los Angeles and Baltimore between Sept. 9 and Oct. 9, 2015. To qualify, travelers must be members of Alaska Airlines’ Mileage Plan and register at www.alaskaair.com. Customers who have not yet joined Mileage Plan can enroll at no cost online.**

The new flights will be operated with fuel-efficient, next generation Boeing 737 aircraft that feature Alaska’s new inflight experience. Alaska Beyond Entertainment offers customers free entertainment on their own devices including video shorts from partners such as National Geographic and Vevo, as well as the option to purchase blockbuster movies and hit TV shows. With Alaska Beyond Delicious, customers can enjoy food and beverages sourced with items from iconic Pacific Northwest brands and experience Alaska’s award-winning service. It’s all part of Alaska BeyondTM — a new way to travel, designed to go above and beyond your expectations.

This fall customers traveling from Los Angeles can connect to 21 destinations on Alaska Airlines’ 600 weekly flights and earn and use award miles to travel to 84 nonstop destinations worldwide on partners American Airlines, Delta Air Lines, Air France, Aeromexico, British Airways, Cathay Pacific, Emirates, Fiji Airways, KLM, Korean Air, LAN and Qantas.