$58 Cheap Flights from San Diego (SAN) to Denver (DEN)

View $58 flight on Wed, Sep 3, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Today's featured flight deals from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN)

Nonstop
Carry-on included
Lower price than typical

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

Prices were available within the past 7 days and start at $58 for one-way flights and $98 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Sep 4 - Sat, Sep 6
SAN
San Diego
DEN
Denver
$98 Roundtrip, found 6 hours ago
$98
Roundtrip
found 6 hours ago
Select Frontier Airlines flight, departing Thu, Sep 4 from San Diego to Denver, returning Sat, Sep 6, priced at $98 found 6 hours ago
Frontier Airlines
Tue, Nov 11 - Wed, Nov 12
SAN
San Diego
DEN
Denver
$100 Roundtrip, found 1 day ago
$100
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Nov 11 from San Diego to Denver, returning Wed, Nov 12, priced at $100 found 1 day ago
Frontier Airlines
Sat, Oct 11 - Sat, Oct 18
SAN
San Diego
DEN
Denver
$103 Roundtrip, found 2 hours ago
$103
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sat, Oct 11 from San Diego to Denver, returning Sat, Oct 18, priced at $103 found 2 hours ago
Frontier Airlines
Wed, Sep 10 - Sun, Sep 14
SAN
San Diego
DEN
Denver
$105 Roundtrip, found 8 hours ago
$105
Roundtrip
found 8 hours ago
Select Frontier Airlines flight, departing Wed, Sep 10 from San Diego to Denver, returning Sun, Sep 14, priced at $105 found 8 hours ago
Frontier Airlines
Wed, Sep 3 - Mon, Sep 8
SAN
San Diego
DEN
Denver
$108 Roundtrip, just found
$108
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Sep 3 from San Diego to Denver, returning Mon, Sep 8, priced at $108 just found
Frontier Airlines
Wed, Sep 3 - Mon, Sep 8
SAN
San Diego
DEN
Denver
$112 Roundtrip, just found
$112
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Sep 3 from San Diego to Denver, returning Mon, Sep 8, priced at $112 just found
Alaska Airlines
Wed, Oct 8 - Wed, Oct 15
SAN
San Diego
DEN
Denver
$130 Roundtrip, just found
$130
Roundtrip
just found
Select Alaska Airlines flight, departing Wed, Oct 8 from San Diego to Denver, returning Wed, Oct 15, priced at $130 just found
Hawaiian Airlines
Sat, Nov 22 - Sat, Dec 6
SAN
San Diego
DEN
Denver
$137 Roundtrip, found 1 day ago
$137
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Sat, Nov 22 from San Diego to Denver, returning Sat, Dec 6, priced at $137 found 1 day ago
United
Wed, Sep 3 - Sat, Sep 6
SAN
San Diego
DEN
Denver
$137 Roundtrip, found 1 hour ago
$137
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Sep 3 from San Diego to Denver, returning Sat, Sep 6, priced at $137 found 1 hour ago
Southwest Airlines
Wed, Sep 3 - Sat, Sep 6
SAN
San Diego
DEN
Denver
$137 Roundtrip, found 1 hour ago
$137
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Wed, Sep 3 from San Diego to Denver, returning Sat, Sep 6, priced at $137 found 1 hour ago

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

September is typically the cheapest month to fly

From $48 - $119 per traveler.

Graph displaying average flight prices per month

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 $131
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $131
Flights from San Diego (SAN) to Denver (DEN)
Origin airport
San Diego Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$98
Distance
852 mi
Average flight time
3 hours 24 mins

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 September. 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 $58 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.

 

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 $58 or cheap return flight from $98 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 September, 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.

Explore a world of travel with Expedia

*Available to One Key members.