Cheap Flights from San Diego CA to Denver International CO from $60

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Flight deals from San Diego to Denver International

Looking for a cheap last-minute deal or the best round-trip flight from San Diego to Denver International? Find the lowest prices on one-way and round-trip tickets right here.

Denver.$60 per passenger.Departing Tue, Sep 30, returning Tue, Oct 7.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Tue, Sep 30, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Oct 7, arriving in San Diego International.Price includes taxes and charges.From $60, select.

Denver.$60 per passenger.Departing Wed, Oct 8, returning Tue, Oct 14.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Wed, Oct 8, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Oct 14, arriving in San Diego International.Price includes taxes and charges.From $60, select.

Denver.$60 per passenger.Departing Sat, Oct 25, returning Sat, Nov 8.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Sat, Oct 25, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Sat, Nov 8, arriving in San Diego International.Price includes taxes and charges.From $60, select.

Denver.$60 per passenger.Departing Mon, Nov 3, returning Tue, Nov 4.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Mon, Nov 3, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Nov 4, arriving in San Diego International.Price includes taxes and charges.From $60, select.

Denver.$60 per passenger.Departing Wed, Aug 20, returning Tue, Aug 26.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Wed, Aug 20, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Aug 26, arriving in San Diego International.Price includes taxes and charges.From $60, select.

Denver.$73 per passenger.Departing Tue, Sep 9, returning Tue, Sep 16.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Tue, Sep 9, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Tue, Sep 16, arriving in San Diego International.Price includes taxes and charges.From $73, select.

Denver.$89 per passenger.Departing Thu, Aug 28, returning Thu, Sep 4.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Thu, Aug 28, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Thu, Sep 4, arriving in San Diego International.Price includes taxes and charges.From $89, select.

Denver.$136 per passenger.Departing Wed, Jul 30, returning Wed, Aug 13.Round-trip flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departing from San Diego International on Wed, Jul 30, arriving in Denver International.Inbound direct flight with Frontier Airlines departing from Denver International on Wed, Aug 13, arriving in San Diego International.Price includes taxes and charges.From $136, select.

Find the cheapest month to fly from San Diego to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Diego to Denver International flights are currently cheapest in August.

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Direct flights from San Diego to Denver International

San Diego to Denver International: Alternative routes

Compare routes from San Diego to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

San Diego to Denver: Flight information

The things to know before you go.

Cheapest flight found	$60
Cheapest month to fly	August
Average flight time	2 hrs, 29 mins
Most popular airline	Southwest Airlines
Average flights per week	183

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

How much are round-trip flights from San Diego to Denver International?

The best price we found for a round-trip flight from San Diego to Denver International is $60. 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.

How long does it take to fly from San Diego to Denver International?

2 hours and 29 minutes is the average flight time from San Diego to Denver International.

Which airlines fly direct from San Diego to Denver International?

Southwest Airlines, United and Alaska Airlines fly direct from San Diego to Denver International.

How many flights are there a week from San Diego to Denver International?

There are 183 flights per week flying from San Diego to Denver International, as of July 2025.

When is the cheapest time to fly from San Diego to Denver International?

The cheapest month to fly from San Diego to Denver International is usually August.

Which upcoming date is cheapest to fly from San Diego to Denver International Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Diego to Denver International Airport on Wednesday, August 20, 2025.

Can I get a direct flight from San Diego to Denver International Airport?

Yes – the average flight time is 2 hours and 29 minutes.

How can I find the best flight deal to Denver International?

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 Denver International 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.

When is the best time to book flights to Denver?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly with from San Diego to Denver International?

The cheapest airline that flies to Denver International is Frontier Airlines.

Traveling from San Diego to Denver International Airport (DEN): What you need to know

Begin planning your trip by looking up where you'll catch your flight from San Diego to Denver International Airport (DEN). Explore your options for setting off from San Diego International Airport (SAN) or McClellan-Palomar Airport (CLD), two of the city's main airports.
Take a direct San Diego to Denver International Airport flight and you'll be in the air for an average of 2 hours 25 minutes.
Denver International Airport is located in Denver. The city runs on the UTC-6 timezone and is one hour ahead of San Diego.
The most popular route is from San Diego International Airport (SAN) to Denver International Airport (DEN), with 78 direct weekly services. If you're not one for hanging around, the earliest flight from SAN to DEN is the 6:20am Southwest Airlines option. If a later flight fits your day better, the last departure is at 9:40pm with Southwest Airlines.
Leave plenty of time to get on your flight from San Diego to DEN. A good rule of thumb is to arrive two hours before international departures and an hour ahead for domestic flights.
With more people on the move during high season, it's a good idea to be at your terminal even earlier. Two hours for domestic flights and up to four for international trips will allow for extra wait times.

Airports in San Diego

San Diego International Airport (SAN)

San Diego International Airport (SAN) will have you traveling directly to your destination. Nonstop flights from San Diego to Denver International Airport (DEN) take off from this terminal.
You'll have your choice of airlines operating direct flights from San Diego to Denver International Airport departing from SAN. Get on board with any of these:
United Airlines ranks first in bookings for flights from SAN to DEN.
Among carriers operating on this route, United Airlines has the highest rate of on-time arrivals.
Located around 5 kilometers from the center of San Diego, SAN can be reached in about 10 minutes by car (depending on traffic). The journey by public transport takes roughly 20 minutes.
Have an early flight from San Diego to Denver International Airport? Avoid the stress of rushing to the terminal (and enjoy a little extra shut-eye) by picking one of these hotels near San Diego International Airport:
Of all flights leaving San Diego International Airport, 71.38% touch down on time at their destination.
The address for SAN is N Harbor Dr.

McClellan-Palomar Airport (CLD)

CLD is about 56 kilometers from central San Diego. It'll take you 40 minutes or so to get to the airport in a car from the city center. Public transport takes approximately 2 hours 15 minutes.
Kick off your vacation early with an additional night away from home. Before catching your San Diego to DEN flight, stay in one of these hotels close to McClellan-Palomar Airport:

About Denver International Airport (DEN)

Once your flight from San Diego to Denver International Airport has landed, kick back at a nearby hotel. Baymont by Wyndham Denver International Airport is a comfy option that's an easy drive from DEN.
Pick up a Denver International Airport rental car and explore Denver and beyond with your own wheels. Routes Car Rentals, Dollar and Budget are popular providers you can book with here.
Lock in the lowest price by reserving your ride around one week ahead of your San Diego to Denver International Airport flight.
The street address for DEN is 8500 Pena Boulevard.

Getting from Denver International Airport (DEN) to central Denver

Denver International Airport to central Denver is roughly 31 kilometers. If you're renting a car or taking a cab, plan ahead to make your trip as smooth as possible. Journey times vary based on the time of day and traffic conditions.
Traveling by public transport typically takes 1 hour 30 minutes.

How to find the cheapest flights from San Diego to Denver International Airport (DEN)

The lowest price we've found for a one-way ticket from San Diego to Denver International Airport is $36. For a return flight on this route, the best price is $60. Depending on the availability and when you book, these fares could change.
Booking early is often the key to finding a cheap flight from San Diego to DEN. Fares tend to rise as demand increases, so the closer you get to departure, the more expensive your ticket may be.
The 'Whole month' search tool shows you the cheapest San Diego to Denver International Airport tickets across the entire month. It's an easy way to find a bargain if your trip dates are flexible.
Locking in a cheap plane ticket from San Diego to DEN is a breeze with Price Alerts. Simply create one of these automatic alerts and we'll let you know as soon as prices go down.
Chase down a great fare on a flight from San Diego to Denver International Airport with the help of the filters. Choose your ideal arrival and departure times, airlines and number of stops. You can also sort your results by 'Cheapest,' 'Best' or 'Fastest.'

The best time to fly from San Diego to Denver International Airport (DEN)

April is the quietest month for flights from San Diego to Denver International Airport (DEN), while July is the busiest. Choose the best time to visit Denver based on whether you like a lively atmosphere or a more laid-back vibe.
Before locking in your San Diego to DEN plane ticket, consider the kind of weather you prefer. July is the warmest month in Denver, with temperatures ranging from 14ºC (57ºF) to 32ºC (90ºF).
Search for cheap tickets from San Diego to Denver International Airport in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -9ºC (16ºF) and 7ºC (45ºF).

More about Denver

Start your Denver trip right by choosing the perfect place to stay. After booking your flight from San Diego to Denver International Airport, check out our range of accommodation options including:
Denver Art Museum and Meow Wolf Denver | Convergence Station are just the start of the popular attractions to add to your Denver itinerary. Continue your sightseeing adventures at Ballpark.

Explore more of the United States

Denver has its own special appeal, but there are so many other corners of the United States just waiting to be discovered. About 113 kilometers south of Denver, a trip to Colorado Springs will keep you on the move. Don't miss top attractions like Garden of the Gods, Pikes Peak Region Attractions and Red Rock Canyon.
If you're eager to discover another major destination in the United States, head for Pueblo, about 177 kilometers south of Denver. Cathedral of the Sacred Heart, Rosemount Museum and Minnequa Lake Park are highlights.