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Cheap Flights from Denver to San Diego

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Compare Denver to San Diego flight deals

Find the cheapest month or even day of the year to fly to San Diego

Book the best San Diego fare with no extra fees

Flight deals from Denver to San Diego

Looking for a cheap last-minute deal or the best return flight from Denver to San Diego? Find the lowest prices on one-way and return tickets right here.
San Diego.53 € per passenger.Departing Tue, 29 Apr, returning Tue, 6 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 29 Apr, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Tue, 6 May, arriving in Denver International.Price includes taxes and charges.From 53 €, select.
San Diego.53 € per passenger.Departing Wed, 14 May, returning Wed, 21 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 14 May, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Wed, 21 May, arriving in Denver International.Price includes taxes and charges.From 53 €, select.
San Diego.53 € per passenger.Departing Wed, 26 Mar, returning Tue, 1 Apr.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 26 Mar, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Tue, 1 Apr, arriving in Denver International.Price includes taxes and charges.From 53 €, select.
San Diego.53 € per passenger.Departing Tue, 22 Apr, returning Tue, 29 Apr.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 22 Apr, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Tue, 29 Apr, arriving in Denver International.Price includes taxes and charges.From 53 €, select.
San Diego.53 € per passenger.Departing Wed, 16 Jul, returning Tue, 22 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 16 Jul, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Tue, 22 Jul, arriving in Denver International.Price includes taxes and charges.From 53 €, select.
San Diego.62 € per passenger.Departing Sat, 31 May, returning Tue, 3 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sat, 31 May, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Tue, 3 Jun, arriving in Denver International.Price includes taxes and charges.From 62 €, select.
San Diego.63 € per passenger.Departing Sat, 7 Jun, returning Sat, 14 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sat, 7 Jun, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Sat, 14 Jun, arriving in Denver International.Price includes taxes and charges.From 63 €, select.
San Diego.67 € per passenger.Departing Wed, 6 Aug, returning Tue, 12 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 6 Aug, arriving in San Diego International.Inbound direct flight with Frontier Airlines departs from San Diego International on Tue, 12 Aug, arriving in Denver International.Price includes taxes and charges.From 67 €, select.

Find the cheapest month to fly from Denver to San Diego

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver to San Diego flights are currently cheapest in April.
Mar
from 122 €
Apr
from 53 €
May
from 53 €
Jun
from 63 €
Jul
from 53 €
Aug
from 67 €
Sep
from 281 €
Oct
from 281 €
Nov
Find prices
Dec
from 289 €
Jan
from 282 €
Feb
Find prices

Direct flights from Denver to San Diego

Alternative Denver to San Diego routes

Looking for the cheapest, fastest or easiest route from Denver to San Diego? You could fly into the following airports instead.

Denver to San Diego: Flight information

The things to know before you go.
Cheapest flight found53 €
Cheapest month to flyApril
Average flight time2 hrs, 27 mins
Most popular airlineSouthwest Airlines
Average flights per week113

Finding cheap flights from Denver to San Diego: Frequently asked questions

There are 2 airports in San Diego: San Diego International and McClellan-Palomar.
The best price we found for a return flight from Denver to San Diego is 53 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 27 minutes is the average flight time from Denver to San Diego.
Southwest Airlines, United and Air Canada fly direct from Denver to San Diego.
As of March 2025, there are 113 flights per week flying from Denver to San Diego.
The cheapest month to fly from Denver to San Diego is usually March 2025.
If you're flying from Denver, the cheapest airport near San Diego is San Diego International – which is 4.1 km away from the centre of San Diego. We've found flights into this airport from 53 €.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Denver to San Diego on Tuesday, 29 April 2025.
Yes – the average flight time is 2 hours and 27 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to San Diego but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to San Diego is around 40 days in advance, so don’t leave your flight to the last minute.
In March, the average temperature is usually around 14°C. August is typically the warmest month in San Diego, when it usually averages around 28°C. You can expect the least rain in June. The coldest month is December, with temperatures averaging 10°C. The rainiest month is February.
The cheapest airline that flies to San Diego is Frontier Airlines .

Flying from Denver to San Diego: what you need to know

  • All great adventures start from Denver's main airport, Denver International Airport (DEN). Explore your options for reserving a flight from Denver to San Diego leaving from this base.

  • When it comes to arriving in San Diego, San Diego International Airport (SAN) is a primary hub. Another is McClellan-Palomar Airport (CLD).

  • A direct flight from Denver to San Diego takes an average of 2 hours 23 minutes. The timezone in San Diego is UTC-7, meaning it's 1 hour behind Denver.

  • With 123 flights a week between the two airports, Denver International Airport (DEN) to San Diego International Airport (SAN) is the most popular route. Board the first flight from Denver to San Diego with Frontier Airlines at 05:01. If you prefer to make the most of your day before you fly, the last departure from DEN to SAN is with United Airlines at 21:05.

  • To ensure you get on your flight from Denver to San Diego, leave enough time to check in and find your gate. Turning up two hours ahead of international departures and one hour before domestic flights is the standard rule.

  • If you're jetting off during a major holiday or other peak period, allow for even more time. A good general rule is two hours ahead of domestic flights and up to four hours before international departures. Lines at security and check-in will be longer.

  • After booking your cheap flights from Denver to San Diego, get your documents in order. A visa or passport isn't required since you're travelling within United States. As long as you have some other valid form of identification, like an ID card or driver's licence, you're ready to go.

Flying from Denver

Denver International Airport (DEN)

  • If you're after a direct flight from Denver to San Diego, you can depart from Denver International Airport (DEN). Get from DEN to San Diego International Airport (SAN) in one seamless journey.

  • If you plan to leave from DEN, you can take a direct flight from Denver to San Diego with United Airlines.

  • We make it simple to book a flight from Denver to San Diego that includes a stopover. To see your options leaving from Denver International Airport, uncheck 'Direct flights only.' Then, choose a flight offering a stop long enough to tour your chosen city. Some popular stopovers include:

    • Los Angeles International Airport (LAX)

    • Phoenix Sky Harbour International Airport (PHX)

    • Harry Reid Airport (formerly McCarran Airport) Airport (LAS)

  • Located around 40 kilometres from the centre of Denver, DEN can be reached in about 34 minutes by car, depending on traffic. The journey by public transport takes roughly 1 hour and 31 minutes.

  • Staying the night at a hotel can take the stress out of arriving at the airport on time. If you're looking for a place to stay before your flight from Denver to San Diego, consider SpringHill Suites Denver Airport. It's a quick drive from Denver International Airport.

Arriving in San Diego

San Diego International Airport (SAN)

  • San Diego International Airport (SAN) to central San Diego is approximately 5 kilometres. It'll take you around 9 minutes to reach the centre driving.

  • If you're travelling on public transport, expect a journey of around 20 minutes.

  • The last thing you want is a long journey to your hotel if you're arriving on a late flight from Denver to San Diego. Reserve one of these accommodation options near SAN instead:

McClellan-Palomar Airport (CLD)

How to find the cheapest flights from Denver to San Diego

  • The cheapest price we've seen for a one-way ticket from Denver to San Diego is 27 €. For a return flight on this route, the best price is 53 €. Depending on when you want to go and the availability, these fares can change.

  • Score cheap tickets from Denver to San Diego by booking 9 months ahead. Based on our research, that's the sweet spot for picking up a bargain.

  • Organise your trip for May. That's the cheapest month for tickets from Denver to San Diego. If you're flexible with your travel dates, use the 'Whole month' tool to find the lowest price across each month.

  • Log into your online account or use the app to set up a Price Alert. We'll notify you straight away if there's a better deal on this route. It's easy to do, and it'll save you the hassle of looking for cheap tickets from Denver to San Diego every day.

  • Tailor your trip using filters. Select your departure and arrival times, total journey duration and airlines. You can also sort your results by 'Cheapest,' 'Best' or 'Fastest' flights from Denver to San Diego.

Best time to go to San Diego

  • It's time to figure out your travel dates for your flight from Denver to San Diego. July is the busiest month to visit San Diego. If you prefer a more relaxed atmosphere, go in May.

  • Before locking in your flight from Denver to San Diego, consider the kind of weather you prefer. August is the warmest month in San Diego, with temperatures ranging from 17ºC to 28ºC.

  • February sees average temperatures of between 7ºC and 23ºC. Look for cheap tickets from Denver to San Diego sometime then if you'd rather travel in cooler conditions.

More about San Diego

Complete your San Diego trip with a car rental

  • Discover our range of car rentals once you've booked your hotel and cheap flight from Denver to San Diego. Whether you're looking for an economy ride, a standard vehicle or even something that'll turn heads, you can compare companies in one go to get the best deal.

Plan the rest of your trip from Denver to San Diego

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.