Cheap flights from San Diego to Denver

One-way fares from $30 · SAN → DEN · prices found by travellers in the last 48 hours

Compare all dates Denver → San Diego
Cheapest fare
$30

Frontier Airlines · Wed, Dec 9

Cheapest month
December

from $30

Direct flights
Yes

Frontier Airlines

Flight time
2h 34m

1,340 km

Get a price alert

We'll email you when San Diego → Denver drops to your price. It's free, and you can stop any time.

Today's cheapest fare is $30. We'll send one email to confirm. See our privacy policy.

Cheapest month to fly from San Diego to Denver

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 $62
  2. December 2026 Cheapest $30
  3. January 2027 $36
  4. February 2027 $31

Cheapest dates in December 2026

The lowest fares we've seen for each day, cheapest first.

Frontier Airlines
Depart11:14 Wed, Dec 9SAN → DEN 2h 42m · Direct
$30one way, per person
View deal
Frontier Airlines
Depart06:30 Fri, Dec 4SAN → DEN 2h 34m · Direct
$34one way, per person
View deal
See every date in December 2026 →

Plan the rest of your trip to Denver

Where to stay, what to do and getting around, from our travel partners.

Where to stay

Hotels in DenverCompare places to stay on Booking.com Find hotels →

Things to do

Things to do in DenverTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in DenverPre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in DenverCompare rental cars from major brands on EconomyBookings Compare cars →

About flights from San Diego to Denver

San Diego (SAN) and Denver (DEN) are about 1,340 km apart. Direct flights take around 2h 34m, and recent direct fares were with Frontier Airlines. Over the next few months, one-way fares start from $30, and December 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from San Diego to Denver?

The cheapest one-way fare we've seen recently is $30 with Frontier Airlines, departing Wednesday, December 9, 2026. Over the coming months, the lowest fare in each month ranges from $30 to $62.

What is the cheapest month to fly from San Diego to Denver?

December 2026 currently has the lowest fares, from $30 one way.

Are there direct flights from San Diego to Denver?

Yes. Recent direct fares were with Frontier Airlines.

How long is the flight from San Diego to Denver?

A direct flight takes about 2h 34m. San Diego and Denver are around 1,340 km apart.

Which airlines fly from San Diego to Denver?

Recent fares on this route were with Frontier Airlines.

More cheap flights from San Diego

Compare flights to Denver from other cities →