$48 Cheap Flights from San Diego (SAN) to Denver (DEN)

View $48 flight on Wed, May 14, 2025Opens in a new window

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Find available prices by choosing your travel dates.

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

Prices were available within the past 7 days and start at $48 for one-way flights and $96 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, May 3 - Sat, May 10
SAN
San Diego
DEN
Denver
$96 Roundtrip, just found
$96
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, May 3 from San Diego to Denver, returning Sat, May 10, priced at $96 just found
Frontier Airlines
Sat, Jun 14 - Tue, Jun 24
SAN
San Diego
DEN
Denver
$103 Roundtrip, found 1 hour ago
$103
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, Jun 14 from San Diego to Denver, returning Tue, Jun 24, priced at $103 found 1 hour ago
Frontier Airlines
Tue, Jun 17 - Sat, Jun 21
SAN
San Diego
DEN
Denver
$110 Roundtrip, just found
$110
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Jun 17 from San Diego to Denver, returning Sat, Jun 21, priced at $110 just found
Frontier Airlines
Tue, Jun 3 - Sat, Jun 7
SAN
San Diego
DEN
Denver
$117 Roundtrip, just found
$117
Roundtrip
just found
Select Frontier Airlines flight, departing Tue, Jun 3 from San Diego to Denver, returning Sat, Jun 7, priced at $117 just found
Frontier Airlines
Sat, Jun 14 - Sat, Jul 12
SAN
San Diego
DEN
Denver
$122 Roundtrip, found 22 hours ago
$122
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Sat, Jun 14 from San Diego to Denver, returning Sat, Jul 12, priced at $122 found 22 hours ago
Frontier Airlines
Wed, Jun 4 - Wed, Jun 18
SAN
San Diego
DEN
Denver
$123 Roundtrip, just found
$123
Roundtrip
just found
Select Frontier Airlines flight, departing Wed, Jun 4 from San Diego to Denver, returning Wed, Jun 18, priced at $123 just found
United
Tue, Jun 10 - Sat, Jun 14
SAN
San Diego
DEN
Denver
$147 Roundtrip, just found
$147
Roundtrip
just found
Select United flight, departing Tue, Jun 10 from San Diego to Denver, returning Sat, Jun 14, priced at $147 just found
Southwest Airlines
Wed, May 14 - Wed, May 21
SAN
San Diego
DEN
Denver
$152 Roundtrip, found 4 hours ago
$152
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Wed, May 14 from San Diego to Denver, returning Wed, May 21, priced at $152 found 4 hours ago
American Airlines
Wed, May 21 - Sat, Jun 28
SAN
San Diego
DEN
Denver
$155 Roundtrip, found 2 days ago
$155
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, May 21 from San Diego to Denver, returning Sat, Jun 28, priced at $155 found 2 days ago
Alaska Airlines
Tue, Jun 3 - Sat, Jun 7
SAN
San Diego
DEN
Denver
$156 Roundtrip, just found
$156
Roundtrip
just found
Select Alaska Airlines flight, departing Tue, Jun 3 from San Diego to Denver, returning Sat, Jun 7, priced at $156 just found

Frequently asked questions

How much does a flight from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN) cost?
Grab cheap return fares starting at $143 from San Diego Intl. Airport (SAN) to Denver Intl. Airport (DEN). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving SAN on May 14 2025 and touching down at DEN. The price was last updated on April 21 2025 and has not changed since.
What is the cheapest month to fly from SAN to DEN?
The cheapest flights from SAN to DEN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
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 to DEN?
With fares starting at $74 for a one-way flight from SAN to DEN, Frontier Airlines is currently the cheapest carrier for this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SAN on July 16 2025. Prices were last updated on April 21 2025 and have not changed since.
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.
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