To San Diego

Cheap Flights from Boston to San Diego

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Boston

RatePunk searches hundreds of travel sites at once for deals on flights to San Diego

Prices updated 24 days ago

486,190 searches this week

171 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated May 29, 2026.)

Today’s best flight deals from Boston to San Diego

Explore current cheapest deals departing from Boston to San Diego

Round trip

Sort by: Cheapest

September 15 - September 23

Cheapest

BOS - San Diego

$323

$207

Round trip

September 16 - September 23

BOS - San Diego

$333

$210

Round trip

December 8 - December 15

BOS - San Diego

$417

$220

Round trip

August 25 - August 29

BOS - San Diego

$468

$229

Round trip

September 16 - September 24

BOS - San Diego

$323

$229

Round trip

October 7 - October 12

BOS - San Diego

$361

$232

Round trip

November 13 - November 17

BOS - San Diego

$393

$238

Round trip

August 18 - August 22

Earliest

BOS - San Diego

$535

$239

Round trip

December 1 - December 5

Best

BOS - San Diego

$455

$239

Round trip

September 4 - September 11

BOS - San Diego

$371

$240

Round trip

Unlock all 500+ flight deals to San Diego and get alerts when great deals appear

Route Intelligence — 486,190 Searches this Week

Insights for flights from Boston to San Diego

When looking for cheap flights from Boston to San Diego, prices typically range from $279–$664, with a median of $422. Right now, current fares are above the typical level for this route. Currently, 59% of recent fares are classified as a good price, indicating a fair chance to find value.

A typical journey from Boston to San Diego takes about 16h 7m, including connections. This duration accounts for the fact that most itineraries involve at least one stopover.

The distance between Boston and San Diego is 4156 km, making this a long-haul route. This considerable distance often means longer travel times and a greater likelihood of connecting flights.

If you are wondering when is the cheapest time to fly from Boston to San Diego, January stands out as the most affordable month, with a median fare of $189. November is also a strong option, offering a median fare of $257, followed by May with a median of $277. These months present the best opportunities for lower prices on this route.

For flights from Boston to San Diego, most itineraries connect at least once, with only 34.1% of recent fares being non-stop. When a connection is necessary, the typical number of stopovers is 2. New deals for this route appear almost daily, so setting a price alert can be beneficial.

How much is a round trip from Boston to San Diego

Regular price: $276 - $835

Prices for flights from Boston to San Diego are currently below the regular range.

The regular price range for flights from Boston to San Diego is between $276 and $835. The current lowest deal is $207 with Southwest Airlines, for travel from Sep 15 to Sep 23.

now $207

Low $276

High $835

The cheapest time to fly from Boston to San Diego

The cheapest month to fly from Boston to San Diego is January, with a median price of $189. The most expensive month is August, with a median price of $498. Prices are generally lower from January to November.

January

Cheapest

Flights from $189

August

Most Expensive

Flights from $498

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from Boston to San Diego

Southwest Airlines

Last-minute flights going from Boston to San Diego

Thu, Jul 2

⌛ Last-Minute

BOS - San Diego

Boston (BOS) - San Diego (SAN)

American Airlines

$873

$266

One-way

Fri, Jul 3

⌛ Last-Minute

BOS - San Diego

Boston (BOS) - San Diego (SAN)

JetBlue Airways

$790

$253

One-way

Fri, Jul 3

⌛ Last-Minute

BOS - San Diego

Boston (BOS) - San Diego (SAN)

JetBlue Airways

$780

$253

One-way

Fri, Jul 3

⌛ Last-Minute

BOS - San Diego

Boston (BOS) - San Diego (SAN)

American Airlines

$846

$257

One-way

Fri, Jul 3

⌛ Last-Minute

BOS - San Diego

Boston (BOS) - San Diego (SAN)

American Airlines

$848

$261

One-way

Fri, Jul 3

⌛ Last-Minute

BOS - San Diego

Boston (BOS) - San Diego (SAN)

American Airlines

$803

$263

One-way

Biggest price drops on these dates for flights from Boston to San Diego

2 nights

Jul 2 - Jul 4

$873 → $266

70%

1 night

Jul 3 - Jul 4

$846 → $257

70%

3 nights

Jul 4 - Jul 7

$845 → $258

69%

4 nights

Jul 3 - Jul 7

$848 → $261

69%

Popular Airports to fly from Boston to San Diego

Boston - San Diego route insights

💸 Price insights

Recent fares are above the typical level

Recent fares for Boston to San Diego are above the typical level, with a median price of $422.

📅 Best time to fly

January is historically cheapest at $189

Historically, January is the cheapest month to fly from Boston to San Diego, with a median price of $189.

⏱️ Flight duration

Connecting flights average 16h 7m

The median flight duration for this long-haul route with connecting flights is 16 hours and 7 minutes.

✈️ Airlines & availability

Connecting flights are dominant on this route

Connecting flights make up 65.9% of deals, with a median of 2 stopovers.

🏆 Airline highlight

Southwest Airlines offers direct deals

Southwest Airlines is one of the carriers offering direct deals from Boston to San Diego.

🎯 Booking tip

Deals are frequent for this route

Deals for flights from Boston to San Diego are frequent, with over 1 deal per day.

Boston main airports to depart from

Logan International (BOS)

Cheapest

Logan International Airport is a convenient departure point for flights to San Diego.

📍 ~5 km from Boston city center (reachable by car or public transport)

💸 Flights from ~$229

San Diego main airports to arrive at

San Diego International (SAN)

Cheapest

San Diego International Airport is a convenient arrival option for flights from Boston to San Diego.

📍 ~5 km from city center (reachable by car)

💸 Flights from ~$252

McClellan–Palomar (CLD)

McClellan–Palomar Airport offers an alternative arrival point for flights from Boston to San Diego.

📍 ~45 km from city center (reachable by car)

💸 Flights from ~$430

Airports nearby San Diego used as alternative

Tijuana International (TIJ)

Tijuana International (TIJ) is an excellent alternative for domestic Mexico flights with lower fares.

📍 ~25 km from San Diego (reachable by car)

💸 Flights from ~$526

John Wayne (SNA)

John Wayne (SNA) is a close major US domestic alternative, often less congested than LAX.

📍 ~120 km from San Diego (reachable by car)

💸 Flights from ~$276

Los Angeles International (LAX)

Cheapest

Los Angeles International (LAX) offers the most extensive international and domestic route options.

📍 ~180 km from San Diego (reachable by car)

💸 Flights from ~$194

Ontario International (ONT)

Ontario International (ONT) is a reliable domestic alternative with growing service, often less congested.

📍 ~180 km from San Diego (reachable by car)

💸 Flights from ~$243

Long Beach (LGB)

Long Beach (LGB) is very easy to navigate with fast security processing for specific West Coast routes.

📍 ~150 km from San Diego (reachable by car)

💸 Flights from ~$279

Business & First Class Flight Deals to San Diego

74% AI deal score

$1,803

From BOS

Elite

Jun 18

San Diego, United States

69% AI deal score

$2,942

From BOS

Elite

Jun 19

San Diego, United States

69% AI deal score

$2,942

From BOS

Elite

Jun 20

San Diego, United States

66% AI deal score

$3,777

Frequently Asked Questions About Flights to San Diego

Historically, the optimal booking window for flights from Boston to San Diego is typically 28-59 days before departure. During this period, the average price observed was $386. In contrast, purchasing tickets 0-6 days out saw an average price of $691, while tickets bought 14-27 days in advance averaged $697. Planning ahead by at least a month can lead to significant savings on this route.

A good deal for a flight from Boston to San Diego is considered to be $279 or less, based on historical data. The median price for this route across the trailing quarter was $422. Prices typically range, with 75% of observed fares being $664 or less. Aiming for a price at or below the good deal threshold can help ensure you're getting a competitive fare.

Historically, January has been the cheapest month to fly from Boston to San Diego, with a median price of $189. November also offers competitive prices, with a median of $257. May, while also listed among the cheapest, had a median price of $277. These months typically offer fares significantly lower than the annual median price of $422 for this route.

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