$69 Cheap United flights Denver (DEN) to San Diego (SAN)

View $69 flight on Tue, Sep 30, 2025Opens in a new window

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$69 Cheap United flights Denver (DEN) to San Diego (SAN)

Prices were available within the past 7 days and start at $69 for one-way flights and $137 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Aug 23 - Wed, Aug 27
DEN
Denver
SAN
San Diego
$137 Roundtrip, found 1 hour ago
$137
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Aug 23 from Denver to San Diego, returning Wed, Aug 27, priced at $137 found 1 hour ago
United
Tue, Sep 30 - Wed, Oct 8
DEN
Denver
SAN
San Diego
$139 Roundtrip, found 10 hours ago
$139
Roundtrip
found 10 hours ago
Select United flight, departing Tue, Sep 30 from Denver to San Diego, returning Wed, Oct 8, priced at $139 found 10 hours ago
United
Sat, Oct 18 - Sun, Oct 19
DEN
Denver
SAN
San Diego
$142 Roundtrip, found 1 hour ago
$142
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Oct 18 from Denver to San Diego, returning Sun, Oct 19, priced at $142 found 1 hour ago
United
Tue, Oct 21 - Wed, Oct 22
DEN
Denver
SAN
San Diego
$148 Roundtrip, found 1 hour ago
$148
Roundtrip
found 1 hour ago
Select United flight, departing Tue, Oct 21 from Denver to San Diego, returning Wed, Oct 22, priced at $148 found 1 hour ago
United
Tue, Sep 30 - Wed, Oct 8
DEN
Denver
SAN
San Diego
$149 Roundtrip, found 10 hours ago
$149
Roundtrip
found 10 hours ago
Select United flight, departing Tue, Sep 30 from Denver to San Diego, returning Wed, Oct 8, priced at $149 found 10 hours ago
United
Thu, Sep 25 - Sun, Sep 28
DEN
Denver
SAN
San Diego
$151 Roundtrip, found 1 hour ago
$151
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Sep 25 from Denver to San Diego, returning Sun, Sep 28, priced at $151 found 1 hour ago
Flights from Denver (DEN) to San Diego (SAN)
Origin airport
Denver Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
Frontier Airlines
Distance
852 mi
Average flight time
1 hour 20 mins

Frequently asked questions

How much is a United Airlines flight from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
Apply the "Price (lowest to highest)" filter on Expedia to find cheap United Airlines return flights from $137 from DEN to SAN. Affordable one-way options from $69 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.
What is the cheapest month to fly from DEN to SAN with United Airlines?
United Airlines flights to San Diego are generally cheaper in the low-season months of January and November. Whether you're in search of a round-trip or one-way ticket, you could land a better deal then.
What is the cheapest time to book flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) with United Airlines?
Search for cheap United Airlines flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) one to three months prior to 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. No matter the fare type and itinerary, the best day to book a domestic flight is generally Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book 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.
Does United Airlines fly nonstop from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
Skip the layovers and fly from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) on any of United Airlines's 39 direct weekly flights. Use Expedia's "Nonstop" and "Airline" filters to find the United Airlines flight that'll land at SAN at a time that suits you.
How long does it take to fly from DEN to SAN with United Airlines?
It takes approximately 2h 29m to fly nonstop from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) with United Airlines.
Which day of the week has the most United Airlines flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
United Airlines has the most flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN) on Thursday. With up to 6 daily departures, you'll get the most flexibility and choice on this day.
What is the earliest United Airlines flight from DEN to SAN?
The earliest flight from DEN to SAN with United Airlines leaves at 8:00AM UTC-7. You'll touch down at 9:30AM UTC-8. The last United Airlines flight of the day takes off at 9:00PM UTC-7 and arrives at 10:30PM UTC-8. With around 20% fewer cancellations for early and mid-morning departures, beginning your travel day early is generally the best option.**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.
What airports does United Airlines fly into in San Diego?
Hop on a United Airlines flight from Denver Intl. Airport (DEN) to San Diego, and you'll most likely touch down at San Diego Intl. Airport (SAN). This is the airline's main hub in this destination.
Why fly with United Airlines from DEN to SAN?
A rewarding loyalty program and the ability to rack up points through United Mileage Plus are the start of the reasons to leave from DEN to SAN with United Airlines. Plus, by joining Expedia's free One Key™ program, you can earn OneKeyCash™* in addition to United Airlines's loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
United Airlines typically flies Boeing 737-900 planes for flights from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN). This carrier also operates the Airbus A321neo on this route. Keep in mind that aircraft type can vary due to operational requirements, so the plane you board might be different on the day you travel.
Can I change or cancel my United Airlines flight from Denver Intl. Airport (DEN) to San Diego Intl. Airport (SAN)?
Changes are usually free within 24 hours of making a booking, but your airline may charge a fee after that. For more information about modifying your flights, check out your "Trips," select your flight and click on "Manage Booking." If you'd like the freedom to make changes without being charged, tick the "Changes included" or "No cancel fee" filter when planning your next getaway.

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