$29 Cheap Flights from San Diego (SAN) to Denver (DEN)

View $29 flight on Sat, Jan 31, 2026Opens in a new window

Popular airlines from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)

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

Prices were available within the past 7 days and start at $29 for one-way flights and $58 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Jan 28 - Sat, Jan 31
SAN
San Diego
DEN
Denver
$58 Roundtrip, just found
$58
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Jan 28 from San Diego to Denver, returning Sat, Jan 31, priced at $58 just found
Frontier Airlines
Wed, Jan 28 - Sat, Jan 31
SAN
San Diego
DEN
Denver
$68 Roundtrip, just found
$68
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Jan 28 from San Diego to Denver, returning Sat, Jan 31, priced at $68 just found
Frontier Airlines
Sun, Dec 21 - Wed, Dec 24
SAN
San Diego
DEN
Denver
$71 Roundtrip, just found
$71
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Dec 21 from San Diego to Denver, returning Wed, Dec 24, priced at $71 just found
Frontier Airlines
Mon, Dec 22 - Thu, Dec 25
SAN
San Diego
DEN
Denver
$77 Roundtrip, just found
$77
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Dec 22 from San Diego to Denver, returning Thu, Dec 25, priced at $77 just found
Frontier Airlines
Sun, Dec 21 - Wed, Dec 24
SAN
San Diego
DEN
Denver
$81 Roundtrip, just found
$81
Roundtrip
just found
Select Frontier Airlines flight, departing Sun, Dec 21 from San Diego to Denver, returning Wed, Dec 24, priced at $81 just found
Frontier Airlines
Tue, Dec 23 - Wed, Dec 31
SAN
San Diego
DEN
Denver
$82 Roundtrip, found 15 hours ago
$82
Roundtrip
found 15 hours ago
Select Frontier Airlines flight, departing Tue, Dec 23 from San Diego to Denver, returning Wed, Dec 31, priced at $82 found 15 hours ago
Alaska Airlines
Mon, Nov 24 - Tue, Dec 2
SAN
San Diego
DEN
Denver
$88 Roundtrip, just found
$88
Roundtrip
just found
Select Alaska Airlines flight, departing Mon, Nov 24 from San Diego to Denver, returning Tue, Dec 2, priced at $88 just found
United
Tue, Dec 16 - Fri, Dec 19
SAN
San Diego
DEN
Denver
$93 Roundtrip, just found
$93
Roundtrip
just found
Select United flight, departing Tue, Dec 16 from San Diego to Denver, returning Fri, Dec 19, priced at $93 just found
Southwest Airlines
Mon, Dec 22 - Tue, Dec 30
SAN
San Diego
DEN
Denver
$102 Roundtrip, found 15 hours ago
$102
Roundtrip
found 15 hours ago
Select Southwest Airlines flight, departing Mon, Dec 22 from San Diego to Denver, returning Tue, Dec 30, priced at $102 found 15 hours ago
Hawaiian Airlines
Mon, Mar 2 - Fri, Mar 6
SAN
San Diego
DEN
Denver
$117 Roundtrip, found 9 hours ago
$117
Roundtrip
found 9 hours ago
Select Hawaiian Airlines flight, departing Mon, Mar 2 from San Diego to Denver, returning Fri, Mar 6, priced at $117 found 9 hours ago

Find the cheapest month to fly from San Diego (SAN) to Denver (DEN)

March is typically the cheapest month to fly

From $58 - $347 per traveler.

Alternative airports near Denver

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $84
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $84

Frequently asked questions

How much does a flight from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) cost?
Get a cheap one-way flight from $29 or cheap return flight from $58 from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
The cheapest month to fly from SAN to DEN is January, when demand is low. Off-peak months are often when you'll find cheap fares for travel between these airports.
Which airlines fly direct from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
You can choose from 3 carriers that fly direct from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). These include:

  • Southwest Airlines
  • United Airlines
  • Frontier Airlines

What is the cheapest airline that flies from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
Frontier Airlines and United Airlines are popular airlines offering competitive fares. Keep in mind that flight prices from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) can vary based on demand, travel dates and how early you book. With Expedia's filter tool, you can easily find a SAN to DEN flight that suits your plans and budget.
How many flights per day from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
With, on average, 13 direct flights departing from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) each day, you'll be jetting off in no time.
What are the most popular departure times for flights from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
Flights between SAN and DEN are busiest at 12 PM. If you'd like a more relaxed trip and possibly cheaper fares, look for a time when demand is lower.
What day of the week has the most flights from SAN to DEN?
Sunday offers the most flights from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). Consider taking off on this day and you'll have a greater chance of finding a departure that fits your itinerary.
What is the earliest flight from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
Hop on the earliest flight at around 6:25AM UTC-8, leaving from San Diego Intl. Airport (SAN). You'll be traveling for around 2h 31m, touching down at Denver Intl. Airport (DEN) at approximately 9:56AM UTC-7.
How long does it take to fly from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
The average flight duration from SAN to DEN is 2 hours and 25 minutes, covering a total distance of 850 mi.
What airline has the least delays from SAN to DEN?
United Airlines has the best track record for on-time direct flights from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN), with an on-time score of 87%. Use the Expedia App to look up your flight schedule before you leave and get real-time alerts about any changes.
What is the best time to fly from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
To avoid potential delays on the San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) route, travel before 3 PM. Later departures have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Denver from San Diego Intl. Airport (SAN)?
Browse your flight options from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). This is the only Denver airport you can arrive at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) last-minute?
Last-minute bookings from SAN to DEN are typically more expensive. To secure the lowest rates, start searching for flights ahead of time. That said, if you're flexible with your travel dates, it's possible to score a cheap fare right before your journey.
Is it cheaper to book a SAN to DEN flight and hotel package?
Opting for a SAN to DEN flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Choose from our extensive range of stays and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)?
Typically, it's possible to cancel or reschedule your SAN to DEN flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
San Diego Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$58
Distance
852 mi
Average flight time
3 hours 22 mins

Book with confidence

San Diego to Denver Flights

The cheapest times to fly from San Diego to Denver

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Diego to Denver are during the month of January. You can find some of the cheapest flights from San Diego to Denver with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Diego to Denver

Sunday is one of the best days to book for cheap flights from San Diego to Denver: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Diego to Denver

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Diego to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $29 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Diego to Denver flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Diego to Denver airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

San Diego to Denver Flights

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*Available to One Key members.