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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 19/2. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SAN
18 Feb — 25 Feb1
1 adult
1 adult, Economy, 0 bags

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 19 January 2026.

Round-trip from

£87

One-way from

£44

Popular in

June

Cheapest in

February

Average price

£117
Alaska Airlines
  • Alaska Airlines
  • 19/2-19/2
  • Nonstop
  • 5h 34m total
  • Denver to San Diego
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United Airlines
  • United Airlines
  • 22/4
  • Nonstop
  • 2h 31m total
  • Denver to San Diego
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Highest demand for flights based on searches. 9% potential increase in price (£11 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 January 2026
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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 19 January 2026.

Thu 19/213:10
DEN
-
SAN
Nonstop2h 39m
Alaska Airlines
Mon 23/214:16
SAN
-
DEN
Nonstop2h 32m
Alaska Airlines
Deal found 19/1£87
Wed 15/407:45
DEN
-
SAN
Nonstop2h 31m
United Airlines
Sun 19/406:32
SAN
-
DEN
Nonstop2h 37m
United Airlines
Deal found 17/1£99
Wed 18/206:30
DEN
-
SAN
Nonstop2h 45m
Southwest
Sat 21/215:45
SAN
-
DEN
Nonstop2h 20m
Southwest
Deal found 18/1£102
Sat 2/513:02
DEN
-
SAN
Nonstop2h 36m
Alaska Airlines
Sun 3/520:28
SAN
-
DEN
Nonstop2h 31m
Alaska Airlines
Deal found 19/1£110
Sat 18/415:55
DEN
-
SAN
1 stop3h 50m
Southwest
Thu 23/419:00
SAN
-
DEN
Nonstop2h 20m
Southwest
Deal found 17/1£114
Fri 1/506:45
DEN
-
SAN
Nonstop2h 25m
Southwest
Sun 3/506:20
SAN
-
DEN
Nonstop2h 25m
Southwest
Deal found 18/1£117
Fri 8/520:00
DEN
-
SAN
Nonstop2h 25m
Southwest
Tue 12/508:40
SAN
-
DEN
2 stops5h 25m
Southwest
Deal found 16/1£127
Fri 6/206:10
DEN
-
SAN
Nonstop2h 45m
Southwest
Sun 8/206:20
SAN
-
DEN
Nonstop2h 30m
Southwest
Deal found 18/1£129
Thu 30/413:02
DEN
-
SAN
Nonstop2h 36m
Alaska Airlines
Sun 3/520:28
SAN
-
DEN
Nonstop2h 31m
Alaska Airlines
Deal found 18/1£132
Tue 3/207:00
DEN
-
SAN
1 stop9h 29m
Alaska Airlines
Wed 11/208:00
SAN
-
DEN
Nonstop2h 38m
Alaska Airlines
Deal found 19/1£136
Sat 4/407:25
DEN
-
SAN
Nonstop2h 41m
Alaska Airlines
Wed 15/408:42
SAN
-
DEN
Nonstop2h 38m
Alaska Airlines
Deal found 18/1£138
Thu 14/506:40
DEN
-
SAN
Nonstop2h 41m
Alaska Airlines
Sun 17/509:23
SAN
-
DEN
Nonstop2h 36m
Alaska Airlines
Deal found 18/1£139

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 19 January 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

Wed 11/2

12:34-14:13

Nonstop2h 39m

San Diego

Wed 18/2

14:16-17:48

Nonstop2h 32m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 26/2

07:55-09:35

Nonstop2h 40m

San Diego

Sun 1/3

20:45-00:05

Nonstop2h 20m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Wed 15/4

21:00-22:30

Nonstop2h 30m

San Diego

Wed 22/4

19:14-22:45

Nonstop2h 31m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 26/2

18:45-20:27

Nonstop2h 42m

San Diego

Sun 1/3

20:19-23:59

Nonstop2h 40m

£87

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sat 2/5

07:00-08:39

Nonstop2h 39m

San Diego

Sun 3/5

08:41-12:06

Nonstop2h 25m

£110

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Fri 8/5

20:46-22:16

Nonstop2h 30m

San Diego

Sun 10/5

06:20-12:17

1 stop4h 57m

£117

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 30/4

13:02-14:38

Nonstop2h 36m

San Diego

Sun 3/5

08:41-12:06

Nonstop2h 25m

£132

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Tue 3/2

07:00-15:29

1 stop9h 29m

San Diego

Wed 11/2

08:00-11:38

Nonstop2h 38m

£136

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Thu 5/3

07:45-09:20

Nonstop2h 35m

San Diego

Sun 8/3

06:30-09:58

Nonstop2h 28m

£140

DenverSan Diego

DEN - SAN

DENSAN

Denver Intl

Sun 29/3

20:11-23:59

1 stop4h 48m

San Diego

Fri 3/4

19:14-22:45

Nonstop2h 31m

£145

Flights are sorted by cheapest return flights first.

Deals found on 17/1

Showing 1-10 of 21 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 9 January 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, April is the cheapest month in which you can book a flight from Denver to San Diego (average of £34). 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 19 January 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 25m. Alaska Airlines provides one of the quickest options available for as low as £114. The distance between Denver and San Diego is about 852 mi. All flights are typically direct.

  • 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: SkyWest Airlines (81%), Alaska Airlines (81%), Frontier( 78%).

  • 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, April is the cheapest month in which you can book a flight from Denver to San Diego (average of £34). 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

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 San Francisco flights
Denver to Las Vegas 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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