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Cheap flights from Denver to San Diego from £44

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Denver to San Diego

Enter your travel dates to find the best prices.

Cheapest flights from Denver to San Diego
Explore the most affordable flight options available from Denver to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 December 2025.

Tue 30/1218:48DEN - SAN
Nonstop2h 40mAlaska Airlines
Fri 2/120:14SAN - DEN
Nonstop2h 45mAlaska Airlines
Deal found 10/12£184
Wed 31/1219:15DEN - SAN
Nonstop2h 32mUnited Airlines
Sun 4/106:30SAN - DEN
Nonstop2h 31mUnited Airlines
Deal found 10/12£188
Thu 25/1212:51DEN - SAN
Nonstop2h 53mAlaska Airlines
Thu 1/120:14SAN - DEN
Nonstop2h 45mAlaska Airlines
Deal found 10/12£199
Wed 24/1213:10DEN - SAN
1 stop27h 23mDelta
Fri 2/116:15SAN - DEN
1 stop5h 02mDelta
Deal found 10/12£206
Wed 24/1207:30DEN - SAN
1 stop4h 15mSouthwest
Thu 1/106:40SAN - DEN
Nonstop2h 30mSouthwest
Deal found 10/12£207
Wed 24/1205:30DEN - SAN
1 stop4h 25mDelta
Wed 31/1216:15SAN - DEN
1 stop5h 02mDelta
Deal found 10/12£229
Wed 24/1213:10DEN - SAN
1 stop27h 23mDelta
Thu 1/116:15SAN - DEN
1 stop5h 02mDelta
Deal found 10/12£237
Wed 17/1210:05DEN - SAN
Nonstop2h 29mAlaska Airlines
Wed 17/1216:02SAN - DEN
Nonstop2h 22mAlaska Airlines
Deal found 10/12£244
Thu 25/1215:20DEN - SAN
1 stop4h 35mSouthwest
Fri 2/119:40SAN - DEN
1 stop5h 00mSouthwest
Deal found 10/12£251
Sat 13/1212:40DEN - SAN
1 stop9h 17mAlaska Airlines
Wed 25/214:16SAN - DEN
Nonstop2h 32mAlaska Airlines
Deal found 10/12£252

Find flight deals from Denver to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 12 December 2025.

Round-trip from

£87

One-way from

£44

Popular in

March

Cheapest in

January

Average price

£134
United Airlines
  • United Airlines
  • 10/1-13/1
  • Nonstop
  • 4h 58m total
  • Denver to San Diego
Search Deals
United Airlines
  • United Airlines
  • 11/2
  • Nonstop
  • 2h 33m total
  • Denver to San Diego
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£3 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Denver to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 12 December 2025.
Use the filters below to find and compare flights from Denver to San Diego that are best for you.

Fly from

Denver

Fly to

San Diego

Route

Depart

Return

Price

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 10/1

15:56-17:28

Nonstop2h 32m

San Diego

Wed 14/1

09:00-12:30

Nonstop2h 30m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 10/1

19:10-20:42

Nonstop2h 32m

San Diego

Tue 13/1

09:00-12:30

Nonstop2h 30m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 9/1

07:45-09:20

Nonstop2h 35m

San Diego

Mon 12/1

11:10-14:41

Nonstop2h 31m

£102

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 24/1

12:34-14:13

Nonstop2h 39m

San Diego

Wed 28/1

16:01-23:35

1 stop6h 34m

£117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 18/1

06:29-12:48

1 stop7h 19m

San Diego

Tue 27/1

07:00-17:34

1 stop9h 34m

£138

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 20/1

12:30-22:42

1 stop11h 12m

San Diego

Sun 25/1

13:45-23:25

1 stop8h 40m

£138

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 23/1

06:29-14:29

1 stop9h 00m

San Diego

Fri 30/1

15:25-23:25

1 stop7h 00m

£138

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 22/1

12:30-18:00

1 stop6h 30m

San Diego

Tue 27/1

07:00-17:34

1 stop9h 34m

£138

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 20/1

06:29-14:29

1 stop9h 00m

San Diego

Mon 26/1

15:25-23:25

1 stop7h 00m

£138

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 2/1

07:00-08:35

Nonstop2h 35m

San Diego

Tue 6/1

16:20-19:40

Nonstop2h 20m

£140

Flights are sorted by cheapest return flights first.

Deals found on 10/12

Showing 1-10 of 24 results
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2
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Best time to book a flight from Denver to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Denver with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Denver to San Diego

How far ahead should I book a flight from Denver to San Diego?

Use this chart to determine the optimal time to book a return flight from Denver to San Diego. Price data was last updated on 5 December 2025.

The price you pay for your flight from Denver to San Diego may vary depending on when you book. For the best chance of a lower fare, look to book 83 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Denver to San Diego?

Currently, January is the cheapest month in which you can book a flight from Denver to San Diego (average of £28). Flying from Denver to San Diego in September is currently the most expensive (average of £56). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to SAN?

Find hourly flight availability from Denver to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 December 2025.

When flying from Denver to San Diego, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from Denver to San Diego?

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated 12 December 2025.
Read through reviews of airlines operating flights from Denver to San Diego, such as Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.8
Fair
3,084 reviews
Check prices

Boarding

6.0

Food

4.6

Entertainment

4.4

Crew

6.6

Comfort

5.5

Overall

5.8

Reviews

1 / 20
4.0
Okay

Chase,Nov 2025

SLC - SEA

Worst part was not frontiers fault but being stuck on the tarmac for an hour at our arrival destination because of another planes issue and the lack of clear communication (said from the pilot himself)
Frontier
5.8
Fair
3,084 reviews
Frontier
5.8
Fair
3,084 reviews
Check prices

Boarding

6.0

Food

4.6

Entertainment

4.4

Crew

6.6

Comfort

5.5

Overall

5.8

Reviews

1 / 20
4.0
Okay

Chase,Nov 2025

SLC - SEA

Worst part was not frontiers fault but being stuck on the tarmac for an hour at our arrival destination because of another planes issue and the lack of clear communication (said from the pilot himself)

Related info for your journey

Find useful and relevant information for your journey from Denver to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Denver to San Diego?

    To fly from Denver to San Diego, you need to book a flight from Denver Intl (DEN) to San Diego (SAN). Nonstop flights to San Diego from Denver Intl take 2h 39m on average. When it comes time to book airfare, you have a few options: there are 25 outbound flights from Denver Intl to San Diego offered by 1 airline.

  • How popular is this Denver to San Diego flight route?

    This flight path from Denver Intl to San Diego was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Denver to San Diego?

    A quick flight from Denver to San Diego can take about 2h 27m. United Airlines provides one of the quickest options available for as low as £87. The distance between Denver and San Diego is about 852 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Denver to San Diego round-trip?

    Our cheapest airline available from Denver to San Diego is Frontier. Our recent data shows that you can find tickets from as low as £46 on this airline. Frontier is priced at 68% lower than the current average price of a flight leaving 3 months from now.

  • What are the most reliable airlines from Denver to San Diego?

    Before booking your flight to San Diego from Denver, check out the most reliable airlines to get you to your destination on time: Frontier (84%), Lufthansa (82%), United Airlines( 80%).

  • Can I find deals for flights from Denver to San Diego that include hotel bookings?

    Yes. In addition to deals on Denver to San Diego flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Denver to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to San Diego.

  • Can I find deals for business class flights from Denver to San Diego?

    Yes. Cheapflights offers flight deals from Denver to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Denver to San Diego?

    Currently, January is the cheapest month in which you can book a flight from Denver to San Diego (average of £28). Flying from Denver to San Diego in September is currently the most expensive (average of £56). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Coronado
El Cajon

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Alternative routes for Denver to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
Denver to San Francisco flights
Denver to Las Vegas flights
Denver to Santa Ana flights

Top airline flying from Denver to San Diego

Discover the top airline that operate flights from Denver to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest£46Average£50FlexibilityNo cancel feeOn-time62%
Search Frontier flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Denver to San Diego?

Cheapflights helps you search for flights from Denver to San Diego via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Denver to San Diego?

Cheapflights simply makes it quick and affordable to book flights from Denver to San Diego by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Denver to San Diego with no change fees?

Yes! Cheapflights helps users easily find flights from Denver to San Diego with no change fees.

Can Cheapflights notify me if prices for flights from Denver to San Diego become cheaper?

Yes, Cheapflights offers price alerts on Denver to San Diego flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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