DEN - SAN

£39 Find Cheap Flights from Denver to San Diego

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to San Diego departing on 15/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to San Diego

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to San Diego, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to San Diego, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Denver to San Diego (DEN-SAN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Denver to San Diego that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Denver to San Diego

Thu, 16 Oct - Wed, 22 Oct
Southwest Logo
21:40 - 23:05DEN-SAN
2h 25mdirect
Southwest Logo
20:15 - 23:50SAN-DEN
2h 35mdirect
£66Southwest
Find Deal
Sat, 25 Oct - Tue, 28 Oct
Southwest Logo
09:20 - 12:40DEN-SAN
4h 20m1 stop
Southwest Logo
10:15 - 16:00SAN-DEN
4h 45m1 stop
£69Southwest
Find Deal
Wed, 22 Oct - Sat, 25 Oct
Southwest Logo
06:40 - 10:25DEN-SAN
4h 45m1 stop
Southwest Logo
11:30 - 16:40SAN-DEN
4h 10m1 stop
£72Southwest
Find Deal
Tue, 7 Oct - Thu, 9 Oct
Southwest Logo
08:10 - 11:55DEN-SAN
4h 45m1 stop
Southwest Logo
20:50 - 00:15SAN-DEN
2h 25mdirect
£73Southwest
Find Deal
Tue, 21 Oct - Tue, 21 Oct
Alaska Airlines Logo
15:00 - 16:23DEN-SAN
2h 23mdirect
Alaska Airlines Logo
20:19 - 23:47SAN-DEN
2h 28mdirect
£82Alaska Airlines
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Wed, 8 Oct - Sat, 11 Oct
Alaska Airlines Logo
07:01 - 08:25DEN-SAN
2h 24mdirect
Alaska Airlines Logo
20:19 - 23:47SAN-DEN
2h 28mdirect
£86Alaska Airlines
Find Deal
Thu, 9 Oct - Tue, 14 Oct
Hawaiian Airlines Logo
07:01 - 08:25DEN-SAN
2h 24mdirect
Hawaiian Airlines Logo
10:32 - 14:00SAN-DEN
2h 28mdirect
£94Hawaiian Airlines
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Tue, 14 Oct - Sat, 18 Oct
United Airlines Logo
13:37 - 14:59DEN-SAN
2h 22mdirect
United Airlines Logo
06:53 - 10:21SAN-DEN
2h 28mdirect
£98United Airlines
Find Deal
Sun, 15 Feb - Thu, 19 Feb
United Airlines Logo
13:45 - 17:49DEN-SAN
5h 04m1 stop
United Airlines Logo
18:30 - 21:43SAN-DEN
2h 13mdirect
£119United Airlines
Find Deal
Sat, 22 Nov - Fri, 28 Nov
Hawaiian Airlines Logo
19:20 - 20:48DEN-SAN
2h 28mdirect
Hawaiian Airlines Logo
20:33 - 23:59SAN-DEN
2h 26mdirect
£143Hawaiian Airlines
Find Deal

Everything you should know

Top airlines
Southwest
Cheapest • from £66 (return)
Frontier
Best reviews • 5.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 24% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 21% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest return fare
£66
Overall average: £116
Southwest
Thu 16/10Wed 22/10
DEN - SAN • Direct
Cheapest one-way flight
£39
Typical prices: £68-154
Frontier
Thu 15/1
DEN - SAN • Direct
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to San Diego!
Booking Insights

KAYAK's insights & trends for Denver to San Diego flights

Get data-powered insights and trends into flights from Denver to San Diego to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Denver to San Diego?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to San Diego, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Denver to San Diego is October, where tickets cost £116 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is £173 and £167 respectively.

How far in advance should I book a flight from Denver to San Diego?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to San Diego, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Denver to San Diego, you should book around 2 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know - Cheap tickets from Denver to San Diego

Low seasonJanuary
Cheapest flight£39
Best time to beat the crowds (12% less expensive on average)
Most popular time to fly and prices are also 21% lower on average.
Flight from Denver to San Diego

When to book flights from Denver to San Diego

Are your dates flexible? Find out the best times to travel from Denver to San Diego based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to San Diego

  • Does San Diego International Airport have lactation rooms?

    You can use three lactation rooms located post-security at Terminal 1 West Rotunda, second level, near the elevator. There’s also a room at Terminal 1 East Rotunda on the ground level after the security checkpoint. In Terminal 2, the lactation room is on the second level close to Gate 34-35. The rooms are fitted with a hand washing station, comfortable seating, artwork, electrical outlets, soft lighting, and a children’s seat.

  • Are there nonstop flights from Denver to San Diego?

    Different airlines, including United Airlines and Frontier, fly nonstop from Denver International Airport to San Diego International Airport. Frontier also flies through the McCarran International Airport (LAS), but the flight could take longer. Book through KAYAK for details on different flights if you want to find the shortest route.

  • Can I travel with my pet through Denver International Airport?

    Yes, the Denver International Airport allows pets. To help you manage your pet, the airport offers a pet relief area in each concourse. There’s also one at the Jeppesen Terminal. The relief rooms are located post-security in the cores of A, B, and C Gates. All pet relief rooms have artificial turf flooring and a drainage system. There are disposal containers and bags.

  • Does San Diego International Airport offer services for disabled passengers?

    Travelers who need special assistance can contact their airlines prior to the trip to request assistance. At the San Diego International Airport, all terminals are wheelchair accessible. You can find an accessible shuttle, and if you need help, there are telephones at the airport’s reservation boards.

  • Is there complimentary Wi-Fi at San Diego International Airport?

    Wi-Fi at the San Diego International Airport is available in 2h sessions. If you want to connect quickly, enable your device's wireless connection and search for #SANfreewifi, then connect. To use the service longer, you just need to log back in when the session expires.

  • What is the cheapest flight from Denver to San Diego?

    In the last 3 days, the lowest price for a flight from Denver to San Diego was £53 for a one-way ticket and £90 for a return.

  • Which airlines offer Wi-Fi service onboard planes from Denver to San Diego?

    Alaska Airlines, Hawaiian Airlines, American Airlines, and Delta offer inflight Wi-Fi service on the Denver to San Diego flight route.

  • Which aircraft models fly most regularly from Denver to San Diego?

    The Airbus A321neo is the aircraft model that flies most regularly on the Denver to San Diego flight route.

  • Which airline alliances offer flights from Denver to San Diego?

    Star Alliance, and oneworld are the airline alliances operating flights between Denver and San Diego, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Denver to San Diego?

    There are direct flights from Denver to San Diego on a daily basis.

  • How does KAYAK find such low prices on flights from Denver to San Diego?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to San Diego.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to San Diego?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to San Diego?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to San Diego with an airline and back to Denver with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to San Diego?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Diego from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Denver to San Diego

  • If you’re in the Front Range Urban Corridor or metropolitan Denver, you can use the Denver International Airport (DEN) to fly to San Diego, California.
  • At Denver International Airport, you can visit several restaurants, including Chick-fil-A at the B Gates Center Core, Ben & Jerry’s Ice Cream at A Gates Center Core, and Dazbog Coffee at C Gates near C47.
  • You can use free Wi-Fi at Denver International Airport. To connect, enable your wireless and locate “DEN Airport Free WiFi.”
  • There’s an Interfaith Chapel and Prayer Hall at the Denver International Airport in the Jeppesen Terminal, Level 6. It’s open 24h a day. You can join a Catholic Mass on Sundays at 1pm.
  • Fights from the Denver International Airport to San Diego land at the San Diego International Airport (SAN), which offers access to downtown San Diego and nearby areas.
  • For quick snacks, the San Diego International Airport offers vending machines located at Terminal 1 in the parking lot under the pedestrian bridge. Others are in Terminal 2 at the Parking Plaza in the lower level near the elevator cores.
  • For shoeshine services at San Diego International Airport, you can access the service at Terminal 2 East near Gate 23 or Terminal 2 West at the North Concourse. The shoeshine service is also available at Terminal 1 above the rotunda escalator.
  • Passengers can use luggage carts provided by Smarte Carte, which cost about $5 per cart. If you’re arriving in the International Arrivals area, the carts are free.

Prefer to fly direct from Denver to San Diego?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Denver Intl to San Diego.
Find which airlines fly direct from Denver Intl Airport to San Diego Airport, which days they fly and book direct flights.

Direct departures

Denver Intl to San Diego

Monday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Tuesday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Wednesday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Thursday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Friday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Saturday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Sunday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

See more direct flights

Direct returns

San Diego to Denver Intl

Monday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Tuesday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Wednesday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Thursday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Friday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Saturday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

Sunday

Alaska Airlines, Frontier, Southwest, +1 more

Alaska Airlines, Frontier, +2 more

See more direct flights

Reviews of the top airline flying from Denver to San Diego

 
See real verified KAYAK customer reviews for airlines flying from Denver to San Diego. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to San Diego? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
5.8
FrontierOverall score based on 3173 reviews
6.1Boarding
5.5Comfort
4.4Entertainment
6.7Crew
4.7Food
Airline reviews

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

10.0 ExcellentAnonymous, Aug 2025ORD - SAN
Read more Frontier reviews

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

What I expected, nickeled and dined and a frontier flight attendant loudly complained about her job and lack of communication as she headed to the gate on her cell phone. Not professional.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

I’m not gonna fly Frontier Airlines because booking is not an option. No water or food is for high price, not equipped for health emergency incompetent crew for emergency services. Cheap airline shows it is cheaper in all service categories. Boarding is the best of all airlines!

Very bad! No good service delayed my second connection flight

Frontier is terrible. Paid for exit row, not given exit row, refused to refund fee.

2 hour delay due to late plane, wrong size plane causing overbooking, and people getting off and on the plane after boarding was completed.

The worst. We never made our connection and they did absolutely nothing to help us at the airport.

I never got to experience the flight because they delayed my first flight and I missed this one. Then Frontier didn't want to help me rebook a flight to get me to my final destination.

The Boarding process in Denver was chaotic, and since the line was so long, we were lined up very far from the gate. If there were any announcements from the gate staff, we didn't hear them. The flight attendants were spectacular. The only negative part of the flight was sitting by a 2 1/2 year old who was unruly and unfortunately had parents that matched his behaviors. Also, the restaurants in Denver on the E concourse, they didn't have food (passengers could only order 1 item on the entire menu) or the restaurants had 12-14 people waiting for orders to be prepared and another 6 people waiting to order. If you have a layover in Denver and need to grab food, be prepared to visit the shops with pre-packaged sandwiches, or you can visit another concourse but it may take a while to transit throughout the airport.

Everything you need to know for your flight from Denver to San Diego

Information on your arrival and departure airports

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