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Cheap flights from Denver to San Diego from £45

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 21/2. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
27 Dec — 3 Jan1
1 adult
1 adult, Economy, 0 bags

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 27 November 2025.

Fri 5/1222:29DEN - SAN
Nonstop2h 30mFrontier
Tue 16/1206:34SAN - DEN
Nonstop2h 38mFrontier
Deal found 25/11£75
Sat 6/1214:22DEN - SAN
Nonstop2h 30mFrontier
Tue 16/1206:34SAN - DEN
Nonstop2h 38mFrontier
Deal found 25/11£78
Tue 9/1213:02DEN - SAN
1 stop5h 51mFrontier
Tue 16/1206:34SAN - DEN
Nonstop2h 38mFrontier
Deal found 25/11£83
Wed 3/1222:29DEN - SAN
1 stop16h 04mFrontier
Sun 25/120:16SAN - DEN
Nonstop2h 37mFrontier
Deal found 25/11£84
Thu 4/1217:43DEN - SAN
Nonstop2h 32mFrontier
Tue 16/1206:34SAN - DEN
Nonstop2h 38mFrontier
Deal found 25/11£89
Tue 9/1213:02DEN - SAN
1 stop5h 51mFrontier
Wed 10/1206:34SAN - DEN
Nonstop2h 38mFrontier
Deal found 25/11£92
Wed 17/1207:45DEN - SAN
Nonstop2h 30mUnited Airlines
Wed 17/1217:45SAN - DEN
1 stop5h 45mUnited Airlines
Deal found 24/11£93
Thu 18/1219:15DEN - SAN
Nonstop2h 32mUnited Airlines
Sun 21/1216:10SAN - DEN
Nonstop2h 30mUnited Airlines
Deal found 26/11£104

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 27 November 2025.

Round-trip from

£45

One-way from

£45

Popular in

March

Cheapest in

October

Average price

£179
Frontier
  • Frontier
  • 8/1-12/1
  • Nonstop
  • 5h 07m total
  • Denver to San Diego
Search Deals
United Airlines
  • United Airlines
  • 21/2
  • Nonstop
  • 2h 39m total
  • Denver to San Diego
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£2 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 November 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 27 November 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 18/12

08:05-09:39

Nonstop2h 34m

San Diego

Wed 24/12

06:30-10:01

Nonstop2h 31m

£149

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 9/12

11:41-17:02

1 stop6h 21m

San Diego

Tue 16/12

13:55-11:44

2 stops20h 49m

£213

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 1/5

19:03-00:01

1 stop5h 58m

San Diego

Tue 5/5

08:00-11:19

Nonstop2h 19m

£214

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 18/12

07:50-14:25

2 stops7h 35m

San Diego

Sun 21/12

18:30-23:35

1 stop4h 05m

£226

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 1/5

07:40-11:15

1 stop4h 35m

San Diego

Tue 5/5

08:40-15:05

2 stops5h 25m

£229

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 2/4

17:10-21:35

2 stops5h 25m

San Diego

Mon 6/4

19:30-00:40

1 stop4h 10m

£233

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 9/12

05:30-08:55

1 stop4h 25m

San Diego

Sun 14/12

06:20-11:44

1 stop4h 24m

£248

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 29/3

19:39-21:11

Nonstop2h 32m

San Diego

Sat 4/4

16:26-00:43

1 stop7h 17m

£267

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 24/2

18:45-20:27

Nonstop2h 42m

San Diego

Tue 3/3

08:00-11:38

Nonstop2h 38m

£270

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 28/2

13:10-14:49

Nonstop2h 39m

San Diego

Sat 28/2

20:19-23:59

Nonstop2h 40m

£270

Flights are sorted by cheapest return flights first.

Deals found on 26/11

Showing 1-10 of 22 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 21 November 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 £29). Flying from Denver to San Diego in September is currently the most expensive (average of £57). 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 27 November 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 27 November 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
3,101 reviews
Check prices

Comfort

5.5

Crew

6.7

Overall

5.8

Food

4.6

Entertainment

4.4

Boarding

6.0

Reviews

1 / 20
6.0
Good

Anonymous,Nov 2025

MCO - RDU

Every time I fly frontier something happens. Last time I flew there was a fight at the gate. Shouting and cursing with kids all around. This time the flight wasn’t full so they allowed us to move seats if we wanted for more space. One guy moved to an exit row and was told he can’t sit there unless he paid extra. That started a fight between him and the flight crew. they called the police to remove him. Last year in NY there was a fight at the gate between the agent and a passenger. Always frontier airlines I’ve never seen this with any other airline. I would never bring my small children again who knows what could happen. Flight was also delayed coming back to Orlando. You get what you pay for with frontier.
Frontier
5.8
Fair
3,101 reviews
Frontier
5.8
Fair
3,101 reviews
Check prices

Comfort

5.5

Crew

6.7

Overall

5.8

Food

4.6

Entertainment

4.4

Boarding

6.0

Reviews

1 / 20
6.0
Good

Anonymous,Nov 2025

MCO - RDU

Every time I fly frontier something happens. Last time I flew there was a fight at the gate. Shouting and cursing with kids all around. This time the flight wasn’t full so they allowed us to move seats if we wanted for more space. One guy moved to an exit row and was told he can’t sit there unless he paid extra. That started a fight between him and the flight crew. they called the police to remove him. Last year in NY there was a fight at the gate between the agent and a passenger. Always frontier airlines I’ve never seen this with any other airline. I would never bring my small children again who knows what could happen. Flight was also delayed coming back to Orlando. You get what you pay for with frontier.

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 30m 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 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 34m. United Airlines provides one of the quickest options available for as low as £149. 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: United Airlines (82%), Lufthansa (81%), Frontier( 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 £29). Flying from Denver to San Diego in September is currently the most expensive (average of £57). 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 27 November 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest£46Average£51FlexibilityNo 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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