United Cheap Flights from Boston to San Diego

View €149 flight on Thu, 19 Feb 2026Opens in a new window
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Prices were available within the past 7 days and start at €149 for one-way flights and €244 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SAN
San Diego
€244 Return, found 1 day ago
€244
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from Boston to San Diego, returning Wed, 21 Jan, priced at €244 found 1 day ago
United
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SAN
San Diego
€287 Return, found 1 day ago
€287
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from Boston to San Diego, returning Wed, 21 Jan, priced at €287 found 1 day ago
United
Mon, 12 Jan - Wed, 21 Jan
BOS
Boston
SAN
San Diego
€299 Return, found 1 day ago
€299
Return
found 1 day ago
Select United flight, departing Mon, 12 Jan from Boston to San Diego, returning Wed, 21 Jan, priced at €299 found 1 day ago

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

March is typically the cheapest month to fly

From €145 - €290 per traveller.

Alternative airports near San Diego

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to McClellan-Palomar CLD. Average driving time to city centre is 38 minutes. Flights from €211
CLD
McClellan-Palomar
Average driving time to city centre38 min
Flights from €211
Boston to San Diego route information
Origin airport
Logan Intl.
Destination airport
San Diego Intl.
Airlines serving
American Airlines, Delta, JetBlue Airways, United
Popular airline
American Airlines
Distance
4131 km
Average flight time
3 hours 48 mins

Frequently asked questions

How much is a United Airlines flight from Logan Intl. Airport (BOS) to San Diego Intl. Airport (SAN)?
Make use of the "Price (lowest to highest)" filter on Expedia to look for cheap United Airlines round-trip flights from €244 from BOS to SAN. Affordable one-way tickets from €149 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from BOS to SAN with United Airlines?
January is one of the least expensive months to get away to San Diego with United Airlines. You could also find fantastic deals on one-way and round-trip fares in November.
Does United Airlines fly nonstop from Logan Intl. Airport (BOS) to San Diego Intl. Airport (SAN)?
Fill in your dates, press search and check the "Nonstop" filter on Expedia to browse any direct flights from BOS to SAN with United Airlines or other airlines.
What airports does United Airlines fly into in San Diego?
Catch a United Airlines flight from Logan Intl. Airport (BOS) to San Diego, and you'll likely arrive at San Diego Intl. Airport (SAN). This is the airline's main hub in this destination.
Can I change or cancel my United Airlines flight from Logan Intl. Airport (BOS) to San Diego Intl. Airport (SAN)?
Depending on the ticket type you purchased, a fee generally applies if you change or cancel your flight more than 24 hours after it has been confirmed. To find flexible fares, select our "Changes included" and "No cancel fee" boxes when searching for flights. For additional information on cancelling or modifying your reservation, head to "Trips," select your flight and tick "Manage Booking."

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*Available to Expedia members.