$89 Cheap United flights Portland (PDX) to San Diego (SAN)

Set the “Price (lowest to highest)” filter on Expedia to look for cheap United Airlines return flights from $177 from PDX to SAN. Affordable one-way tickets from $89 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Browse for return or one-way flights to San Diego in January or November. You could find cheaper fares with United Airlines during these off-peak times.

Look for cheap United Airlines flights from Portland Intl. Airport (PDX) to San Diego Intl. Airport (SAN) one to three months ahead of your departure day. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare class and journey, the ideal day to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To figure out if there’s a direct trip from PDX to SAN with United Airlines or another airline, check the “Nonstop” filter when searching for tickets.

To find the earliest departure from PDX to SAN with United Airlines, filter your search by “Early Morning” and “Morning.” Choosing an early flight usually means you’ll experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Hop on a United Airlines flight from Portland Intl. Airport (PDX) to San Diego, and you’ll likely arrive at San Diego Intl. Airport (SAN). This is the airline’s main hub in this destination.

Offering a rewarding loyalty program, United Airlines is a favorite of many travelers departing from PDX to SAN. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the ticket type you purchased, a fee generally applies if you modify or cancel your flight more than 24 hours after confirmation. To secure flexible fares, select our “Changes included” or “No cancel fee” filter when you look for flights. For more details on changing or canceling your reservation, visit “Trips,” select your flight and tick “Manage Booking.”