Cheap flights from Denver to San Diego from £38

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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
20 Nov — 27 Nov1
1 adult
1 adult, Economy

Find 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 21 October 2025.

Thu 11/1218:59DEN - SAN
Nonstop2h 24mAlaska Airlines
Mon 15/1216:02SAN - DEN
Nonstop2h 22mAlaska Airlines
Deal found 20/10£62
Sat 6/1214:45DEN - SAN
1 stop4h 10mSouthwest
Sat 13/1206:30SAN - DEN
Nonstop2h 30mSouthwest
Deal found 19/10£66
Mon 8/1215:55DEN - SAN
Nonstop2h 25mSouthwest
Thu 11/1210:20SAN - DEN
1 stop4h 35mSouthwest
Deal found 20/10£72
Wed 10/1213:30DEN - SAN
1 stop4h 25mSouthwest
Mon 15/1206:30SAN - DEN
1 stop4h 40mSouthwest
Deal found 20/10£72
Sat 6/1214:45DEN - SAN
1 stop4h 10mSouthwest
Sun 7/1208:35SAN - DEN
1 stop3h 55mSouthwest
Deal found 19/10£79
Thu 4/1213:30DEN - SAN
1 stop4h 25mSouthwest
Fri 12/1217:35SAN - DEN
1 stop4h 00mSouthwest
Deal found 20/10£82
Wed 3/1207:00DEN - SAN
Nonstop2h 35mSouthwest
Sun 7/1206:30SAN - DEN
Nonstop2h 30mSouthwest
Deal found 20/10£84
Sat 20/1219:30DEN - SAN
1 stop3h 55mSouthwest
Wed 24/1210:30SAN - DEN
1 stop4h 25mSouthwest
Deal found 19/10£86

Cheap 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 21 October 2025.

Round-trip from

£62

One-way from

£38

Popular in

March

Cheapest in

February

Average price

£130
Alaska Airlines
  • Alaska Airlines
  • 11/12-15/12
  • Nonstop
  • 4h 46m total
  • Denver to San Diego
Southwest
  • Southwest
  • 31/12
  • 1 total stop
  • 4h 25m total
  • Denver to San Diego
Highest demand for flights based on searches. 2% potential increase in price (£2 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£3 potential savings vs. average return price).
Average for round-trip flights in October 2025

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 21 October 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

Thu 15/1

11:15-15:00

1 stop4h 45m

San Diego

Wed 21/1

10:30-15:50

1 stop4h 20m

£72

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 6/2

16:30-18:00

Nonstop2h 30m

San Diego

Mon 9/2

08:05-11:30

Nonstop2h 25m

£75

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 3/3

19:50-12:47

1 stop17h 57m

San Diego

Wed 4/3

15:15-18:33

Nonstop2h 18m

£78

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 12/1

12:35-16:55

1 stop5h 20m

San Diego

Sat 17/1

08:55-16:15

1 stop6h 20m

£79

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 16/1

20:45-22:20

Nonstop2h 35m

San Diego

Sun 18/1

08:35-12:00

Nonstop2h 25m

£80

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 12/12

11:41-17:02

1 stop6h 21m

San Diego

Thu 18/12

15:44-19:18

Nonstop2h 34m

£82

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 15/1

11:15-15:00

1 stop4h 45m

San Diego

Sun 18/1

10:30-15:50

1 stop4h 20m

£82

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 4/1

05:40-09:00

1 stop4h 20m

San Diego

Tue 6/1

10:30-15:50

1 stop4h 20m

£86

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 27/1

12:34-14:13

Nonstop2h 39m

San Diego

Sun 1/2

20:10-23:59

Nonstop2h 49m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 1/1

06:40-08:15

Nonstop2h 35m

San Diego

Sun 4/1

06:35-10:05

Nonstop2h 30m

£87

Flights are sorted by cheapest return flights first.

Deals found on 20/10

Showing 1-10 of 23 results
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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 17 October 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 80 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 21 October 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.

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 21 October 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.

Boarding

6.1

Food

4.6

Comfort

5.5

Crew

6.7

Entertainment

4.4

Overall

5.8

Reviews

1 / 20
2.0
Mediocre

Shawn,Sept 2025

SAN - SFO

The flight was over booked and was unadble to get help with issue. I could not get a refund or rebooked in order to make my trip

Boarding

6.1

Food

4.6

Comfort

5.5

Crew

6.7

Entertainment

4.4

Overall

5.8

Reviews

1 / 20
2.0
Mediocre

Shawn,Sept 2025

SAN - SFO

The flight was over booked and was unadble to get help with issue. I could not get a refund or rebooked in order to make my trip

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 17m on average. When it comes time to book airfare, you have a few options: there are 21 outbound flights from Denver Intl to San Diego offered by 1 airline.

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

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

    A quick flight from Denver to San Diego can take about 4h 45m. Southwest provides one of the quickest options available for as low as £69. The distance between Denver and San Diego is about 852 mi.

  • 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 (81%), Air Canada (78%), United Airlines( 74%).

  • 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.

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 21 October 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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