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Cheap flights from Denver to San Diego from £43

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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
15 Mar — 22 Mar1
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 13 February 2026.

Fri 27/322:29
DEN
-
SAN
Nonstop2h 39m
Frontier
Fri 3/421:28
SAN
-
DEN
Nonstop2h 33m
Frontier
Deal found 10/2£50
Tue 10/319:25
DEN
-
SAN
Nonstop2h 38m
United Airlines
Sun 15/306:30
SAN
-
DEN
Nonstop2h 28m
United Airlines
Deal found 10/2£86
Tue 17/313:10
DEN
-
SAN
Nonstop2h 39m
Alaska Airlines
Tue 17/320:19
SAN
-
DEN
Nonstop2h 40m
Alaska Airlines
Deal found 11/2£100
Thu 5/307:45
DEN
-
SAN
Nonstop2h 35m
United Airlines
Sun 8/306:30
SAN
-
DEN
Nonstop2h 28m
United Airlines
Deal found 12/2£101
Wed 11/307:50
DEN
-
SAN
Nonstop2h 35m
Southwest
Wed 11/311:20
SAN
-
DEN
1 stop4h 50m
Southwest
Deal found 10/2£108
Fri 8/521:05
DEN
-
SAN
Nonstop2h 30m
Southwest
Wed 13/514:50
SAN
-
DEN
Nonstop2h 25m
Southwest
Deal found 12/2£114
Sat 7/316:10
DEN
-
SAN
1 stop4h 38m
United Airlines
Tue 10/316:12
SAN
-
DEN
Nonstop2h 26m
United Airlines
Deal found 13/2£115
Thu 12/305:30
DEN
-
SAN
1 stop4h 10m
Southwest
Mon 16/319:30
SAN
-
DEN
Nonstop2h 30m
Southwest
Deal found 12/2£121
Tue 19/515:49
DEN
-
SAN
Nonstop2h 30m
United Airlines
Tue 26/510:49
SAN
-
DEN
1 stop6h 01m
United Airlines
Deal found 10/2£122
Tue 3/318:45
DEN
-
SAN
Nonstop2h 42m
Alaska Airlines
Thu 5/320:19
SAN
-
DEN
Nonstop2h 40m
Alaska Airlines
Deal found 10/2£128
Thu 5/305:35
DEN
-
SAN
Nonstop2h 40m
Southwest
Sun 15/306:45
SAN
-
DEN
Nonstop2h 30m
Southwest
Deal found 12/2£130
Fri 6/320:00
DEN
-
SAN
1 stop4h 40m
United Airlines
Sun 8/306:30
SAN
-
DEN
Nonstop2h 28m
United Airlines
Deal found 12/2£131

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 13 February 2026.

Round-trip from

£50

One-way from

£43

Popular in

June

Cheapest in

February

Average price

£99
Frontier
  • Frontier
  • 27/3-3/4
  • Nonstop
  • 5h 12m total
  • Denver to San Diego
Search Deals
Southwest
  • Southwest
  • 11/3
  • Nonstop
  • 2h 35m total
  • Denver to San Diego
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£11 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 February 2026
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 13 February 2026.
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

Sun 8/3

07:40-09:34

Nonstop2h 54m

San Diego

Thu 12/3

14:16-17:48

Nonstop2h 32m

£128

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 25/3

21:05-22:43

Nonstop2h 38m

San Diego

Mon 30/3

19:14-22:45

Nonstop2h 31m

£137

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 16/3

18:15-23:48

1 stop6h 33m

San Diego

Thu 19/3

06:15-11:33

1 stop4h 18m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 24/5

06:40-08:21

Nonstop2h 41m

San Diego

Wed 27/5

15:28-19:01

Nonstop2h 33m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 25/7

21:00-22:25

Nonstop2h 25m

San Diego

Sat 1/8

18:55-22:27

Nonstop2h 32m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 16/3

18:15-23:48

1 stop6h 33m

San Diego

Tue 24/3

15:45-23:23

1 stop6h 38m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 12/7

06:00-07:36

Nonstop2h 36m

San Diego

Fri 17/7

08:00-11:34

Nonstop2h 34m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 29/5

15:49-17:14

Nonstop2h 25m

San Diego

Sun 31/5

06:35-10:08

Nonstop2h 33m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Mon 9/3

18:15-23:48

1 stop6h 33m

San Diego

Mon 16/3

15:45-23:23

1 stop6h 38m

£145

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 30/5

19:41-21:25

Nonstop2h 44m

San Diego

Fri 5/6

15:28-19:01

Nonstop2h 33m

£145

Flights are sorted by cheapest return flights first.

Deals found on 9/2

Showing 1-10 of 20 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 6 February 2026.

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, February 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 £54). 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 13 February 2026.

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.

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.

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

    This flight path from Denver Intl to San Diego was viewed by 1 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 35m. United Airlines provides one of the quickest options available for as low as £86. The distance between Denver and San Diego is about 852 mi. This flight may include one or multiple stops.

  • 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: Alaska Airlines (81%), SkyWest Airlines (81%), Frontier( 79%).

  • 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, February 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 £54). 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

Browse thousands of different options on Cheapflights for your next trip

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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

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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