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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 17/1. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
16 Oct — 23 Oct1
1 adult
1 adult, Economy

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 16 September 2025.

Round-trip from

£86

One-way from

£38

Popular in

March

Cheapest in

October

Average price

£134
Southwest
  • Southwest
  • 27/12-3/1
  • Nonstop
  • 4h 55m total
  • Denver to San Diego
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Frontier
  • Frontier
  • 17/1
  • Nonstop
  • 2h 47m total
  • Denver to San Diego
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£1 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£2 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Find flight deals from Denver to San Diego

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 16 September 2025.

Wed 8/1007:01DEN - SAN
Nonstop2h 24mAlaska Airlines
Tue 14/1020:19SAN - DEN
Nonstop2h 28mAlaska Airlines
Deal found 16/9£86
Tue 9/1213:30DEN - SAN
1 stop4h 25mSouthwest
Sat 20/1220:40SAN - DEN
Nonstop2h 25mSouthwest
Deal found 14/9£90
Wed 15/1007:01DEN - SAN
Nonstop2h 24mAlaska Airlines
Mon 20/1020:19SAN - DEN
Nonstop2h 28mAlaska Airlines
Deal found 15/9£93
Sat 1/1119:55DEN - SAN
Nonstop2h 25mSouthwest
Sat 15/1106:35SAN - DEN
2 stops6h 15mSouthwest
Deal found 15/9£97
Sat 27/1205:35DEN - SAN
1 stop4h 55mSouthwest
Sat 3/117:10SAN - DEN
1 stop3h 50mSouthwest
Deal found 16/9£100
Thu 9/1007:01DEN - SAN
Nonstop2h 24mHawaiian Airlines
Mon 13/1020:19SAN - DEN
Nonstop2h 28mHawaiian Airlines
Deal found 15/9£101
Thu 20/1113:30DEN - SAN
1 stop4h 25mSouthwest
Sat 22/1117:10SAN - DEN
1 stop3h 50mSouthwest
Deal found 15/9£104
Thu 18/1219:15DEN - SAN
Nonstop2h 32mUnited Airlines
Sun 21/1217:40SAN - DEN
1 stop5h 46mUnited Airlines
Deal found 15/9£105
Tue 25/1105:30DEN - SAN
1 stop4h 30mSouthwest
Mon 1/1219:40SAN - DEN
1 stop5h 00mSouthwest
Deal found 15/9£107
Mon 24/1120:15DEN - SAN
Nonstop2h 30mSouthwest
Fri 28/1106:30SAN - DEN
1 stop4h 45mSouthwest
Deal found 16/9£108
Wed 15/1019:50DEN - SAN
Nonstop2h 29mAlaska Airlines
Sat 18/1010:32SAN - DEN
Nonstop2h 28mAlaska Airlines
Deal found 15/9£112
Thu 13/1107:50DEN - SAN
2 stops7h 35mSouthwest
Mon 17/1110:20SAN - DEN
1 stop4h 35mSouthwest
Deal found 15/9£113

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 16 September 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 8/11

14:45-17:50

1 stop4h 05m

San Diego

Tue 11/11

06:30-12:10

1 stop4h 40m

£93

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 15/11

14:45-17:50

1 stop4h 05m

San Diego

Wed 19/11

10:20-15:55

1 stop4h 35m

£93

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 11/12

13:30-16:55

1 stop4h 25m

San Diego

Tue 6/1

18:50-22:10

Nonstop2h 20m

£97

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 14/10

06:40-10:25

1 stop4h 45m

San Diego

Sat 18/10

09:15-16:20

1 stop6h 05m

£100

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 9/10

07:01-08:25

Nonstop2h 24m

San Diego

Mon 13/10

20:19-23:47

Nonstop2h 28m

£101

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 27/2

12:30-13:56

Nonstop2h 26m

San Diego

Sun 1/3

08:00-11:19

Nonstop2h 19m

£101

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 25/12

15:20-18:55

1 stop4h 35m

San Diego

Wed 31/12

15:15-18:35

Nonstop2h 20m

£101

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 23/11

20:15-21:45

Nonstop2h 30m

San Diego

Thu 4/12

08:40-13:35

1 stop3h 55m

£104

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 25/11

05:30-09:00

1 stop4h 30m

San Diego

Mon 1/12

19:40-01:40

1 stop5h 00m

£107

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 21/11

05:40-07:15

Nonstop2h 35m

San Diego

Fri 28/11

06:30-12:15

1 stop4h 45m

£108

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 20 results
1
2

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 12 September 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 61 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 £585). Flying from Denver to San Diego in July is currently the most expensive (average of £920). 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 16 September 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 16 September 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
3,172 reviews
Check prices

Overall

5.8

Food

4.7

Comfort

5.5

Boarding

6.1

Entertainment

4.4

Crew

6.7

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.
Frontier
5.8
Fair
3,172 reviews
Frontier
5.8
Fair
3,172 reviews
Check prices

Overall

5.8

Food

4.7

Comfort

5.5

Boarding

6.1

Entertainment

4.4

Crew

6.7

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.

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 23m on average. When it comes time to book airfare, you have a few options: there are 22 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 11 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 4h 05m. Southwest provides one of the quickest options available for as low as £93. 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 £45 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 cheapest airlines to fly from Denver to San Diego one-way?

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as £43. However, be on the lookout for offers from Hawaiian Airlines and United Airlines, as they are both options that can get you from Denver to San Diego for a low price.

  • 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 (77%), Air Canada (69%), United Airlines( 66%).

  • 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 £585). Flying from Denver to San Diego in July is currently the most expensive (average of £920). 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 Las Vegas flights
Denver to San Francisco 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 16 September 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest£45Average£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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