$48 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.

Sat, May 3 - Sat, May 10
DEN
Denver Intl.
SAN
San Diego Intl.
$97 Roundtrip, just found
$97
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, May 3 from Denver Intl. to San Diego Intl., returning Sat, May 10, priced at $97 just found
Fri, May 2 - Sat, May 3
DEN
Denver Intl.
CLD
McClellan-Palomar
$301 Roundtrip, found 6 days ago
$301
Roundtrip
found 6 days ago
Select American Airlines flight, departing Fri, May 2 from Denver Intl. to McClellan-Palomar, returning Sat, May 3, priced at $301 found 6 days ago

Airfares from $48 One Way, $96 Round Trip from Boulder to Carlsbad

Prices starting at $96 for return flights and $48 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.

Tue, May 13 - Wed, May 14
DEN
Denver
SAN
San Diego
$96 Roundtrip, found 1 hour ago
$96
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Tue, May 13 from Denver to San Diego, returning Wed, May 14, priced at $96 found 1 hour ago
Wed, Aug 6 - Sat, Aug 9
DEN
Denver
SAN
San Diego
$197 Roundtrip, found 8 hours ago
$197
Roundtrip
found 8 hours ago
Select Southwest Airlines flight, departing Wed, Aug 6 from Denver to San Diego, returning Sat, Aug 9, priced at $197 found 8 hours ago
Wed, Jul 16 - Wed, Jul 23
DEN
Denver
SAN
San Diego
$197 Roundtrip, found 8 hours ago
$197
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Jul 16 from Denver to San Diego, returning Wed, Jul 23, priced at $197 found 8 hours ago
Sat, May 17 - Wed, May 21
DEN
Denver
CLD
Carlsbad
$211 Roundtrip, found 3 days ago
$211
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sat, May 17 from Denver to Carlsbad, returning Wed, May 21, priced at $211 found 3 days ago
Thu, Nov 13 - Mon, Nov 17
DEN
Denver
SAN
San Diego
$217 Roundtrip, found 6 hours ago
$217
Roundtrip
found 6 hours ago
Select Delta flight, departing Thu, Nov 13 from Denver to San Diego, returning Mon, Nov 17, priced at $217 found 6 hours ago

Carlsbad economy flight packages

Price found within the past 48 hours. Click for updated prices.
The Sofia Hotel
3.5-star property

The Sofia Hotel

8.2/10 Very Good! (1,442 reviews)

Jun 15 - Jun 18

3 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Coach

San Diego (SAN) to Denver (DEN)

Southwest Airlines • Coach
per person
found 1 day ago
The hotel was well staffed and the rooms where clean.

Reviewed on Apr 14, 2025

Alma San Diego Downtown, a Tribute Portfolio Hotel
4.0-star property

Alma San Diego Downtown, a Tribute Portfolio Hotel

8.8/10 Excellent! (515 reviews)

Jun 15 - Jun 18

3 night stay

Denver (DEN) to San Diego (SAN)

Frontier Airlines • Coach

San Diego (SAN) to Denver (DEN)

Southwest Airlines • Coach
Save 100% on your flight
per person
found 1 day ago
There were many homeless people in the area

Reviewed on Apr 20, 2025

Estancia La Jolla Hotel & Spa
4.0-star property

Estancia La Jolla Hotel & Spa

8.8/10 Excellent! (182 reviews)

May 29 - Jun 1

3 night stay

Denver (DEN) to San Diego (SAN)

Alaska Airlines • Non-stop • Coach

San Diego (SAN) to Denver (DEN)

Frontier Airlines • Non-stop • Coach
per person
found 1 day ago
Very nice place I will come again with my family

Reviewed on May 27, 2024

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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, Copa Airlines, Lufthansa, United Airlines
Earliest Flight Arrival
2:15PM UTC
Latest Flight Arrival
6:14AM UTC

Boulder to Carlsbad

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Mobile Apps for Boulder to Carlsbad Flights

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 Budget Flying Made Simple

Finding cheap flights from Boulder to Carlsbad is easy with Orbitz. You can pick and choose airlines for your international flights to create inexpensive yet convenient travel arrangements.

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.