Cheap flights from San Diego to Denver from $124 CLD, SAN → DEN

Found recently, and the cheapest we hold

What have prices looked like?

Over 32 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $102 to $733.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other 7-night return fares leaving within 3 days of 20 Feb 2027 to compare.

Every date we hold

94 fares on 6 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $122.

Found recently, and the cheapest we hold

What have prices looked like?

Over 45 days, 24 Sept to 12 Nov, the cheapest one-way we saw each day was $20 to $176.

At $241, the cheapest one-way found recently is above that range.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

Yes. Among one-way fares leaving within 3 days of 22 Nov, 25 Nov costs $128: $113 less than the cheapest found recently.

Frontier Airlines · San Diego International Airport (SAN) → Denver International Airport (DEN) · 1 stop · found 3 days ago

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Every date we hold

3 fares on 2 departure dates

Return

Fares 60 to 89 days before departure were typically 15% lower than 14 to 29 days before departure.

From the cheapest return each day between 24 Sept and 12 Nov (32 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

One-way

Fares 60 to 89 days before departure were typically 84% lower than 0 to 6 days before departure.

From the cheapest one-way each day between 24 Sept and 12 Nov (45 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

How much is a return flight from San Diego to Denver?

The cheapest return found recently is $124 with Frontier Airlines, 20 Feb 2027 to 27 Feb 2027, found 8 hours ago. The cheapest return we hold, of any age, is $122 with Frontier Airlines, 8 Dec to 9 Dec, found 3 days ago. The cheapest return fare on each of 6 departure dates is usually $124 to $151.

How much is a one-way flight from San Diego to Denver?

The cheapest one-way found recently is $241 with American Airlines, 22 Nov, found yesterday. The cheapest one-way we hold, of any age, is $128 with Frontier Airlines, 25 Nov, found 3 days ago.

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

December 2026 is the cheapest month for a return, from $122, 8 Dec to 9 Dec, found 3 days ago.

How far ahead should I book a flight from San Diego to Denver?

In 32 days of prices between 24 Sept and 12 Nov, return fares 60 to 89 days before departure were typically 15% lower than 14 to 29 days before departure. In 45 days of prices between 24 Sept and 12 Nov, one-way fares 60 to 89 days before departure were typically 84% lower than 0 to 6 days before departure.

Is there a direct flight from San Diego to Denver?

Yes, the cheapest nonstop return found recently is $124 with Frontier Airlines, 20 Feb 2027 to 27 Feb 2027, found 8 hours ago.

How long is the flight from San Diego to Denver?

The cheapest one-way found recently, with American Airlines on 22 Nov, takes 4 h 32 min with 1 stop.

Which airlines have the cheapest flights from San Diego to Denver?

Between 8 Dec and 20 Feb 2027, Frontier Airlines has the cheapest return on all 6 departure dates we hold.