$25 Cheap flight deals from Boulder (DEN) to Carlsbad (SAN)

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This Weekend's Flight Deals from Boulder to Carlsbad

This weekend's flight prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Sep 19 - Sun, Sep 21
DEN
Denver Intl.
SAN
San Diego Intl.
$186 Roundtrip, just found
$186
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Sep 19 from Denver Intl. to San Diego Intl., returning Sun, Sep 21, priced at $186 just found
Sat, Sep 20 - Sun, Sep 21
DEN
Denver Intl.
CLD
McClellan-Palomar
$695 Roundtrip, found 1 day ago
$695
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Sep 20 from Denver Intl. to McClellan-Palomar, returning Sun, Sep 21, priced at $695 found 1 day ago

Airfares from $25 One Way, $81 Round Trip from Boulder to Carlsbad

Prices starting at $81 for return flights and $25 for one-way flights to Carlsbad were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Dec 11 - Tue, Dec 16
DEN
Denver
SAN
San Diego
$81 Roundtrip, found 1 day ago
$81
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Dec 11 from Denver to San Diego, returning Tue, Dec 16, priced at $81 found 1 day ago
Sat, Oct 25 - Sun, Oct 26
DEN
Denver
SAN
San Diego
$84 Roundtrip, found 1 day ago
$84
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Oct 25 from Denver to San Diego, returning Sun, Oct 26, priced at $84 found 1 day ago
Sat, Oct 25 - Mon, Oct 27
DEN
Denver
SAN
San Diego
$87 Roundtrip, found 5 days ago
$87
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Oct 25 from Denver to San Diego, returning Mon, Oct 27, priced at $87 found 5 days ago
Thu, Oct 23 - Tue, Oct 28
DEN
Denver
SAN
San Diego
$91 Roundtrip, found 4 days ago
$91
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Thu, Oct 23 from Denver to San Diego, returning Tue, Oct 28, priced at $91 found 4 days ago
Sat, Nov 8 - Sun, Nov 9
DEN
Denver
SAN
San Diego
$91 Roundtrip, just found
$91
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Nov 8 from Denver to San Diego, returning Sun, Nov 9, priced at $91 just found

Carlsbad economy flight packages

Price found within the past 48 hours. Click for updated prices.
Old Town Western Inn & Suites
2.5-star property

Old Town Western Inn & Suites

7.4/10 Good! (1,015 reviews)

Oct 31 - Nov 2

2 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $314, price is now $204 per person
$204
per person
found 1 day ago
My room had no place to hang clothes. I tried to call the desk using the button on the phone. It didn't work. I rarely watch TV, but when I tried to turn it on, it didn't work, I went to the desk and asked how I could fix it. I got erroneous information which did not fix the problem. Some of the work around the base of the bathroom wall was not finished. The breakfast was sub standard. The bed and the housekeeping were excellent.

Reviewed on Jul 21, 2025

Coronado Beach Resort
3.0-star property

Coronado Beach Resort

9/10 Wonderful! (723 reviews)

Nov 2 - Nov 8

6 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $1,290, price is now $784 per person
$784
per person
found 18 hours ago
We had such a fabulous stay! I am so glad we stayed here versus the hotel del Coronado. The staff was so friendly, the one bedroom so spacious with a kitchen, such fabulous amenities that we used their bikes to bike around the island, hot tub, and the location is unbeatable. A great deal for the price we were so so happy here!

Reviewed on Apr 7, 2024

Sand Castle Inn
2.5-star property

Sand Castle Inn

8.2/10 Very Good! (480 reviews)

Nov 2 - Nov 8

6 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $823, price is now $511 per person
$511
per person
found 18 hours ago
Great stay as usual. I absolutely love staying here.

Reviewed on Nov 27, 2023

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More About Flying To Carlsbad from Boulder

Route Information for Flights from Boulder to Carlsbad

Origin Airport IATA Code
DEN
Destination Airport IATA Code
SAN
Distance
852 mi
Direct Flight Airlines
Air Canada, Frontier Airlines, Southwest Airlines, Lufthansa, United Airlines
Earliest Flight Arrival
2:30PM UTC
Latest Flight Arrival
4:14AM UTC

Boulder to Carlsbad

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Frequently asked questions

Are there non-stop flights from Boulder to Carlsbad?
Buckle up and enjoy a relaxing flight on board one of the 3 airlines that fly directly from DIA airport to San Diego, CA (SAN-San Diego Intl.). Here's a list of reliable carriers to book with:

  • Southwest Airlines
  • United Airlines
  • Frontier Airlines

What is the shortest flight from Boulder to Carlsbad?
If conditions are good and all goes according to plan, you could be landing at San Diego, CA (SAN-San Diego Intl.) from Denver, CO (DEN-Denver Intl.) in just 2 hours and 20 minutes. With such a quick flight time, contemplate bringing just hand luggage.
What airlines fly from Boulder to Carlsbad most frequently?
Check out Southwest Airlines (WN). This airline offers some of the most frequent flights from Denver Intl. Airport (DEN) to San Diego Airport. It operates 178 services on this route every month and is popular with passengers. If you can't find the right flight there, check out the fares with United Airlines (UA). This airline is a fantastic alternative and operates 152 flights between Boulder and Carlsbad each month.
What is the cheapest day of the week to fly?
Consider flying out early in the week to save on your airfare. Orbitz data from 2021 shows that Monday is the cheapest day to depart, followed by Tuesday. Saturday showed the highest average ticket prices likely because many travelers prefer to start their vacation on a weekend.
What is the cheapest month to fly?
We won't keep you guessing, according to Orbitz data from 2021, the cheapest month to fly is February. Perfect for those who need a weekend getaway, or just a break from it all in the shortest month of the year. Be aware that the most expensive time to fly is during the height of summer in July, and in the holiday month of December.*According to flight demand on Orbitz.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.