Cheap Flights from Boston to Carlsbad

View €103 flight on Sat, 13 Sep 2025Opens in a new window

Popular airlines from Boston to Carlsbad

  • 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 15% 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 Boston to Carlsbad (BOS-SAN)

Prices were available within the past 7 days and start at €103 for one-way flights and €208 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 30 Aug - Sat, 6 Sep
BOS
Boston
SAN
San Diego
€208 Return, found 5 days ago
€208
Return
found 5 days ago
Select Delta flight, departing Sat, 30 Aug from Boston to San Diego, returning Sat, 6 Sep, priced at €208 found 5 days ago
American Airlines
Sat, 30 Aug - Sat, 6 Sep
BOS
Boston
SAN
San Diego
€216 Return, found 5 days ago
€216
Return
found 5 days ago
Select American Airlines flight, departing Sat, 30 Aug from Boston to San Diego, returning Sat, 6 Sep, priced at €216 found 5 days ago
American Airlines
Sat, 30 Aug - Sat, 6 Sep
BOS
Boston
CLD
Carlsbad
€225 Return, found 5 days ago
€225
Return
found 5 days ago
Select American Airlines flight, departing Sat, 30 Aug from Boston to Carlsbad, returning Sat, 6 Sep, priced at €225 found 5 days ago
American Airlines
Sat, 30 Aug - Sat, 6 Sep
BOS
Boston
SAN
San Diego
€225 Return, found 5 days ago
€225
Return
found 5 days ago
Select American Airlines flight, departing Sat, 30 Aug from Boston to San Diego, returning Sat, 6 Sep, priced at €225 found 5 days ago
JetBlue Airways
Sat, 30 Aug - Sat, 6 Sep
BOS
Boston
SAN
San Diego
€226 Return, found 5 days ago
€226
Return
found 5 days ago
Select JetBlue Airways flight, departing Sat, 30 Aug from Boston to San Diego, returning Sat, 6 Sep, priced at €226 found 5 days ago
United
Sat, 30 Aug - Sat, 6 Sep
BOS
Boston
SAN
San Diego
€309 Return, found 5 days ago
€309
Return
found 5 days ago
Select United flight, departing Sat, 30 Aug from Boston to San Diego, returning Sat, 6 Sep, priced at €309 found 5 days ago

Find the cheapest month to fly from Boston (BOS) to San Diego (SAN)

September is typically the cheapest month to fly

From €118 - €228 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.