$54 Cheap flight deals from Boulder (DEN) to Carlsbad (SAN)

Earn rewards on top of your airline miles with Orbitz Rewards

Many airlines offer flexible change policies

Sign up to receive text alerts about your trip

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, May 29 - Sun, May 31
DEN
Denver Intl.
SAN
San Diego Intl.
$309 Roundtrip, just found
$309
Roundtrip
just found
Select Bargain Flight flight, departing Fri, May 29 from Denver Intl. to San Diego Intl., returning Sun, May 31, priced at $309 just found
Sun, May 31 - Sat, Jun 6
DEN
Denver Intl.
CLD
McClellan-Palomar
$345 Roundtrip, found 9 hours ago
$345
Roundtrip
found 9 hours ago
Select United flight, departing Sun, May 31 from Denver Intl. to McClellan-Palomar, returning Sat, Jun 6, priced at $345 found 9 hours ago

Airfares from $54 One Way, $108 Round Trip from Boulder to Carlsbad

Prices starting at $108 for return flights and $54 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.

Wed, Aug 26 - Wed, Sep 2
DEN
Denver
SAN
San Diego
$108 Roundtrip, found 9 hours ago
$108
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Wed, Aug 26 from Denver to San Diego, returning Wed, Sep 2, priced at $108 found 9 hours ago
Sat, Aug 29 - Tue, Sep 1
DEN
Denver
SAN
San Diego
$118 Roundtrip, found 3 hours ago
$118
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Aug 29 from Denver to San Diego, returning Tue, Sep 1, priced at $118 found 3 hours ago
Sat, Aug 15 - Sat, Aug 22
DEN
Denver
SAN
San Diego
$122 Roundtrip, found 3 days ago
$122
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, Aug 15 from Denver to San Diego, returning Sat, Aug 22, priced at $122 found 3 days ago
Wed, Sep 23 - Tue, Sep 29
DEN
Denver
SAN
San Diego
$177 Roundtrip, found 4 hours ago
$177
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Sep 23 from Denver to San Diego, returning Tue, Sep 29, priced at $177 found 4 hours ago
Wed, Aug 19 - Tue, Aug 25
DEN
Denver
SAN
San Diego
$177 Roundtrip, found 2 days ago
$177
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Aug 19 from Denver to San Diego, returning Tue, Aug 25, priced at $177 found 2 days ago

Carlsbad economy flight packages

Price found within the past 48 hours. Click for updated prices.
Margaritaville Hotel San Diego Gaslamp Quarter
4.0-star property

Margaritaville Hotel San Diego Gaslamp Quarter

9/10 Wonderful! (1,358 reviews)

Jun 25 - Jun 30

5 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $1,570, price is now $891 per person
$891
per person
found 1 day ago
We were able to check in early and check out late, but of course had to pay a fee

Reviewed on Oct 3, 2025

Hyatt Vacation Club at The Welk, San Diego Area
3.5-star property

Hyatt Vacation Club at The Welk, San Diego Area

8.4/10 Very Good! (1,826 reviews)

Jun 25 - Jun 30

5 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $1,962, price is now $1,132 per person
$1,132
per person
found 1 day ago
We, unfortunately, had a situation where my wife and I were away for most of the afternoon and evening, and my 3 children (14, 11, 11) were by themselves. Apparently, on Sunday afternoon, new keys to our room were given to another group of people, and that group entered our residence, finding it occupied. This scared our kids pretty bad. The group apologized and left, but they were still pretty shaken (a lesson to use the door latch). That also made our keys to no longer work (our kids let us in when we returned). We didn't make a big deal out of it as we were leaving early the next morning for our flight home. I'm sure it was an honest mistake, just a very unfortunate situation.

Reviewed on Mar 26, 2026

Los Bungalows
2.5-star property

Los Bungalows

8.2/10 Very Good! (529 reviews)

Jul 11 - Jul 18

7 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Non-stop roundtrip • Coach
Save 100% on your flight
Price was $1,558, price is now $926 per person
$926
per person
found 1 day ago
The ac was amazinggg and the room was super clean and spacious with a very comfortable bed. Beach view was absolutely amazing. I loved watching the sunset. Had an amazing time! Will definitely be coming back again c:

Reviewed on Apr 3, 2026

Don't see what you're looking for?
See all available trips from Boulder to Carlsbad
View all trips

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
Direct Flight Airlines
Earliest Flight Arrival
Latest Flight Arrival

Boulder to Carlsbad

For the best travel experience from Boulder to Carlsbad domestic and international travelers everywhere choose Orbitz for guaranteed low prices and cutting-edge mobile tools.

Convenient Low-Cost Travel

Orbitz makes it simple to book discount flights from Boulder to {destination.name} without compromising your schedule. You can always find deals on domestic flights from a location near you. You may find the best deals to fit your schedule by mixing and matching airlines to get you from Boulder to Carlsbad.

Access Orbitz On The Move

You can access Orbitz anywhere at anytime for travel from Boulder to Carlsbad using the latest technology. Via your mobile phone you can track any changes to your flight status, gate and baggage claim details, and with Orbitz’s full-service mobile apps for iPhone and Android you can view these trip details anytime anywhere. You can also get fare alerts and travel updates to keep you informed of the cheapest flights from Boulder to Carlsbad.

Earn Rewards on Your Boulder to Carlsbad Flights

At Orbitz you can benefit from low cost travel and have your loyalty rewarded on certain types of Boulder to Carlsbad flights. All you need to do is enter you frequent flyer number when booking and rack up your rewards through Orbitz online on the Traveler Information page for use on future flights. You can even add your frequent flyer number to an existing reservation to start the ball rolling.

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.

More Destinations

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.