$45 Cheap flight deals from Carlsbad (SAN) to Boulder (DEN)

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This Weekend's Flight Deals from Carlsbad to Boulder

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, Jul 11 - Sat, Jul 12
SAN
San Diego Intl.
DEN
Denver Intl.
$169 Roundtrip, just found
$169
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Jul 11 from San Diego Intl. to Denver Intl., returning Sat, Jul 12, priced at $169 just found
Fri, Jul 11 - Sun, Jul 27
CLD
McClellan-Palomar
DEN
Denver Intl.
$335 Roundtrip, found 3 days ago
$335
Roundtrip
found 3 days ago
Select American Airlines flight, departing Fri, Jul 11 from McClellan-Palomar to Denver Intl., returning Sun, Jul 27, priced at $335 found 3 days ago

Airfares from $45 One Way, $88 Round Trip from Carlsbad to Boulder

Prices starting at $88 for return flights and $45 for one-way flights to Boulder were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Oct 11 - Sat, Oct 18
SAN
San Diego
DEN
Denver
$88 Roundtrip, found 1 day ago
$88
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, Oct 11 from San Diego to Denver, returning Sat, Oct 18, priced at $88 found 1 day ago
Tue, Sep 30 - Tue, Oct 7
SAN
San Diego
DEN
Denver
$98 Roundtrip, found 1 day ago
$98
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Sep 30 from San Diego to Denver, returning Tue, Oct 7, priced at $98 found 1 day ago
Fri, Nov 14 - Sun, Nov 16
SAN
San Diego
DEN
Denver
$108 Roundtrip, found 21 hours ago
$108
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Fri, Nov 14 from San Diego to Denver, returning Sun, Nov 16, priced at $108 found 21 hours ago
Thu, Sep 4 - Mon, Sep 8
SAN
San Diego
DEN
Denver
$157 Roundtrip, just found
$157
Roundtrip
just found
Select Southwest Airlines flight, departing Thu, Sep 4 from San Diego to Denver, returning Mon, Sep 8, priced at $157 just found
Thu, Sep 4 - Mon, Sep 8
SAN
San Diego
DEN
Denver
$157 Roundtrip, just found
$157
Roundtrip
just found
Select United flight, departing Thu, Sep 4 from San Diego to Denver, returning Mon, Sep 8, priced at $157 just found

Boulder economy flight packages

Price found within the past 48 hours. Click for updated prices.
The Slate Denver, Tapestry Collection By Hilton
4.0-star property

The Slate Denver, Tapestry Collection By Hilton

9.4/10 Exceptional! (1,289 reviews)

Aug 23 - Aug 26

3 night stay

San Diego (SAN) to Denver (DEN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
per person
found 1 day ago
Across the street from the convention center, on a quiet street, just a block away from restaurants, light rail, bus, on-site dining if needed. Great for a few nights stay.

Reviewed on Apr 8, 2025

The Maven Hotel at Dairy Block
4.0-star property

The Maven Hotel at Dairy Block

9.4/10 Exceptional! (1,094 reviews)

Aug 23 - Aug 26

3 night stay

San Diego (SAN) to Denver (DEN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
per person
found 1 day ago
Great vibe. Unique.

Reviewed on Oct 27, 2024

The Rally Hotel at McGregor Square
4.0-star property

The Rally Hotel at McGregor Square

9.6/10 Exceptional! (1,386 reviews)

Aug 23 - Aug 26

3 night stay

San Diego (SAN) to Denver (DEN)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
per person
found 1 day ago
The property is great and many places to go in walking distance.

Reviewed on Apr 22, 2025

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More About Flying To Boulder from Carlsbad

Route Information for Flights from Carlsbad to Boulder

Origin Airport IATA Code
SAN
Destination Airport IATA Code
DEN
Distance
852 mi
Direct Flight Airlines
Air Canada, Frontier Airlines, Southwest Airlines, Copa Airlines, Swiss, Lufthansa, United Airlines
Earliest Flight Arrival
3:50PM UTC
Latest Flight Arrival
4:29AM UTC

Carlsbad to Boulder

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Frequently asked questions

Are there non-stop flights from Carlsbad to Boulder?
Yes, if you're heading from San Diego, CA (SAN-San Diego Intl.) to Denver Intl. Airport (DEN), you'll only have one flight number to keep in mind. There are 3 airlines that offer nonstop services to pick from. Here are a few of the best:

  • Southwest Airlines
  • United Airlines
  • Frontier Airlines

What is the shortest flight from Carlsbad to Boulder?
If conditions are good and all goes according to plan, you could be flying into DIA airport from San Diego, CA (SAN-San Diego Intl.) in as little as 2 hours and 15 minutes. With such a fast flight time, consider traveling with hand luggage only.
What airlines fly from Carlsbad to Boulder most frequently?
Southwest Airlines (WN) offers 178 flights every month between San Diego, CA (SAN-San Diego Intl.) to Denver, CO (DEN-Denver Intl.). Your next big adventure is just a few clicks away. Alternatively, reserve your favorite window (or aisle) seat with United Airlines (UA). You'll have 152 monthly flights between Carlsbad and Boulder to select from with this carrier.
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.