- OneTravel
- Cheap Flights
- Caribbean
- Puerto Rico
- San Juan
- AUS to SJU Flights
Expires Jun 30, 2026. Where applicable discount applies to service fees for qualified airline tickets. Amount of service fee discount varies: maximum savings of $10 per person applied to bookings from one (1) traveler up to five (5) travelers; the maximum discount applied is $50. Promo Code and Instant Savings offers can be combined up to the amount of our service fees but cannot be used or combined with any other coupons, promotions or special offers. May be withdrawn at any time without notice. Promo code only applicable for bookings created over the phone through our call center.
20+ Years of ExperienceHelping 40M+ travelers worldwide Partnered with 1M+ verified hotels
24/7 Travel AdvisorsPersonalized planning and real human support, anytime
Upfront PricingOur prices include taxes and fees
Members Save MoreJoin ClubMiles rewards program and save on every booking

Sign up now and level up your travel experience.
Savings Unlocked!

By signing up, you agree to receive marketing emails from OneTravel (Fareportal).

Read more
Daniel Brown · Apr 22, 2026Read more
Sophia Martinez · Apr 22, 2026Read more
Benjamin Roberts · Apr 22, 2026Read more
Michael Harris · Apr 22, 2026San Juan is the capital and most populous municipality in the Commonwealth of Puerto Rico. The city was founded by Spanish colonists in 1521 as Ciudad de Puerto Rico. San Juan is the second-oldest European-established capital city in the Americas and a key cruise ship destination. Tourists must visit this city for its sandy beaches, historic forts, a rich colonial architectural heritage, and a flamboyant musical ambiance. This is upheld by numerous hotspots that offer fine dining and entertainment scenes.
Things to do in San Juan
Old San Juan
Old San Juan, home to almost 500 years of world-class architectural and historical identity, is the older part of the city of San Juan. Visitors can see its historic forts and more than 400 beautifully restored 16th- and 17th-century colonial buildings. Main highlight here is the Fuerte San Felipe del Morro, a fortress set on an elevated land overlooking the sea.
Fuerte San Felipe del Morro
Fuerte San Felipe del Morro is a 16th century fortress constructed on a point of land just above the Atlantic Ocean. The fort was completed over a period of 250 years as it was continuously subjected to many pirate raids and attacks from the sea pirates. Today, it features a maze of ramps, outposts, barracks, dungeons, and tunnels that are all sprinkled with circular sentry boxes.
Castillo de San Cristobal
Castillo de San Cristobal is the largest fort ever erected by the Spanish in the Americas or the New World. The fort is spread across more than 27 acres with 5 individual units linked by moat and tunnel. The difference between El Morro and the Castillo is that the former was constructed to guard against attacks by sea while the latter was constructed to guard against a land-based attack.
Best Time to Visit San Juan
The best time to book flights from Austin to San Juan is from December to April. It is the season when tourists can have a great time at beach, indulging in water sports. Tourists can book flights from AUS to SJU during summers to enjoy famous cultural events like San Sebastián Street Festival, Maricao Coffee Festival, Casals Festival and Ponce Carnival.

We offer a number of discount and savings opportunities to our customers. When searching for airfares, discount and savings claims are based on multiple factors, including searching over 500 airlines to find the available fare. Coupon codes are valid for savings for qualified bookings off our service fees. Seniors and youth may find specific discounted fares offered by certain airlines subject to airline qualifications. Military, bereavement and visually impaired travelers are eligible for discounts off our post-booking service fees as outlined in our compassion exception policy.
* Unless otherwise noted, fares are one way/roundtrip. Fares include all fuel surcharges, taxes & fees and our service fees . Displayed fares are based on historical data, are subject to change. Tickets are nonrefundable, nontransferable, non-assignable and subject to airline restrictions. Name changes are not permitted. There is a higher probability of seats at the stated fare being available on Tuesday, Wednesday and Thursday, and it may require an advance purchase of up to 21 days and/or a Saturday night stay at the destination. Certain blackout dates may apply. Holidays and weekend travel may have a surcharge. See Terms and conditions for other restrictions..

© 2008-2026 WK Travel, Inc. All rights reserved. California: CST #2090295-40, Washington: SOT #602785938, Florida: SOT #ST38063, Hawaii: SOT #13234761