$99 Cheap United flights San Diego (SAN) to Denver (DEN)

Set the “Price (lowest to highest)” filter on Expedia to search for cheap United Airlines round-trip flights from $147 from SAN to DEN. Affordable one-way fares from $99 are available too.**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 Denver in January or November. You could find lower fares with United Airlines during these quieter months.

For cheap United Airlines fares from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN), start searching one to three months before your planned departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence the price you pay. Sunday is usually the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**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.

Depart on one of United Airlines’s 39 weekly direct flights from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). To see what’s available, enter your destination, origin and dates and hit search. Then select the “Nonstop” and “Airline” filters.

From takeoff till landing, a direct United Airlines flight from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) takes around 2h 28m.

If you’re looking for flexibility, Thursday offers the most choice for United Airlines flights from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). You can select from 6 different departures.

The first United Airlines flight from SAN to DEN departs at 7:00AM UTC-8, landing at 10:28AM UTC-7. If you want to jet off later, the last United Airlines flight leaves SAN at 6:30PM UTC-8 and touches down at DEN at 9:58PM UTC-7. Flying before midday is often a good option as morning flights are less likely to be canceled.**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.

United Airlines flights from San Diego Intl. Airport (SAN) to Denver arrive at Denver Intl. Airport (DEN). This is the main gateway to this destination.

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

United Airlines typically flies Airbus A321neo planes for flights from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). This airline also operates the Boeing 737 MAX 9 on this route. Remember that aircraft type can vary depending on operational demands, so the plane you catch might be different when you leave.

Changes are usually free within 24 hours of booking, but your airline may charge you after that time. For more details about modifying your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the flexibility to change your plans without additional charges, apply the “No cancel fee” or “Changes included” filter when planning your next escape.