Flights to San Diego from Boulder - ￥12,750

View ￥12,750 flight on Sat, Aug 23, 2025Opens in a new window

Popular airlines from Boulder to San Diego

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 40% on select hotels after you book a flight*
  • payments icon
    Earn twice
    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Boulder to San Diego (DEN-SAN)

Prices were available within the past 7 days and start at ￥12,750 for one-way flights and ￥31,200 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Aug 21 - Sun, Aug 24
DEN
Denver
CLD
Carlsbad
￥31,200 Roundtrip, found 3 days ago
￥31,200
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Aug 21 from Denver to Carlsbad, returning Sun, Aug 24, priced at ￥31,200 found 3 days ago
Delta
Thu, Aug 21 - Sun, Aug 24
DEN
Denver
SAN
San Diego
￥31,200 Roundtrip, found 3 days ago
￥31,200
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Aug 21 from Denver to San Diego, returning Sun, Aug 24, priced at ￥31,200 found 3 days ago
American Airlines
Thu, Aug 21 - Sun, Aug 24
DEN
Denver
SAN
San Diego
￥31,200 Roundtrip, found 3 days ago
￥31,200
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Aug 21 from Denver to San Diego, returning Sun, Aug 24, priced at ￥31,200 found 3 days ago
American Airlines
Sat, Aug 2 - Mon, Aug 4
DEN
Denver
SAN
San Diego
￥31,510 Roundtrip, found 4 days ago
￥31,510
Roundtrip
found 4 days ago
Select American Airlines flight, departing Sat, Aug 2 from Denver to San Diego, returning Mon, Aug 4, priced at ￥31,510 found 4 days ago
Delta
Sat, Aug 2 - Mon, Aug 4
DEN
Denver
SAN
San Diego
￥32,910 Roundtrip, found 4 days ago
￥32,910
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Aug 2 from Denver to San Diego, returning Mon, Aug 4, priced at ￥32,910 found 4 days ago
United
Sat, Aug 2 - Mon, Aug 4
DEN
Denver
SAN
San Diego
￥35,150 Roundtrip, found 4 days ago
￥35,150
Roundtrip
found 4 days ago
Select United flight, departing Sat, Aug 2 from Denver to San Diego, returning Mon, Aug 4, priced at ￥35,150 found 4 days ago

Find the cheapest month to fly from Denver (DEN) to San Diego (SAN)

August is typically the cheapest month to fly

From ￥6,950 - ￥18,553 per traveler.

Graph displaying average flight prices per month

*Available to Expedia members.