Flights Boston → San Diego
As of October 2026, economy flights from Boston to San Diego have a typical range USD 209–546, median USD 258. Full range across all 215 offers: USD 158–752. We analyzed 215 offers from 8 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: Boston → San Diego
Based on 215 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Boston → San Diego
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| American Airlines | Included | USD 35 | — |
| American | — | USD 110 | — |
| Alaska Airlines | Included | USD 35 | — |
| Alaska | — | USD 90 | — |
| United Airlines | Included | USD 35 | — |
| Delta | Included | USD 35 | — |
| JetBlue | Included | USD 35 | — |
| Southwest Airlines | Included | Included | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from Boston to San Diego cost?
Based on 215 offers · October 2026
Boston to San Diego flights ranged from USD 158 to USD 752 across 215 offers analyzed in October 2026. The chart below shows how prices distributed across all 215 offers.
These 215 offers (October 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 228 and USD 388
What hidden fees do Boston to San Diego flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Boston to San Diego routes. The breakdown below is based on 215 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| AA | 54 | 19% |
| American | 110 | 39% |
| AS | 31 | 7% |
| Alaska | 90 | 35% |
| UA | 45 | 18% |
| DL | 42 | 10% |
| B6 | 35 | 9% |
| WN | 18 | 5% |
American: base ~USD 166 + fees USD 110 = ~USD 276 total. Southwest Airlines: base ~USD 391 + fees USD 18 = ~USD 409 total.
American's USD 110 ancillary fees narrow the gap with Southwest Airlines's lower-fee model — the USD 225 base difference shrinks to USD 133 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Boston to San Diego?
8 airlines flew Boston to San Diego in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (American Airlines), fares ranged USD 219–556 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 American Airlines | 57 | 219–556 | 243 | 54 (22%) |
 Alaska | 2 | 209–301 | 255 | 90 (35%) |
 United Airlines | 70 | 208–296 | 256 | 45 (18%) |
 American | 11 | 238–371 | 276 | 110 (40%) |
 B6 | 7 | 228–585 | 352 | 35 (10%) |
 Delta Air Lines | 11 | 396–425 | 396 | 42 (11%) |
 Alaska Airlines | 22 | 228–682 | 408 | 31 (8%) |
 Southwest Airlines | 35 | 242–698 | 409 | 18 (4%) |
Where do the best Boston → San Diego prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: Boston to San Diego flights
- Full-service carriers on Boston–San Diego cost 0.8x more than budget airlines (USD 306 vs USD 381 median; overall median USD 258).
- American charges 6.1x more in ancillary fees than WN — USD 110 vs USD 18 avg per booking.
- The same route priced USD 383 apart depending on where it was booked — the lowest median was USD 239. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from Boston to San Diego cost?
- Based on 215 offers analyzed, Boston to San Diego flights range from USD 158 to USD 752, with a median price of USD 258. Search for your specific dates →
- What hidden fees should I expect on Boston to San Diego flights?
- On average, ancillary fees (bags, seat selection) add USD 45 to the base fare on Boston to San Diego flights. See itemized fees for your itinerary →
- Which airline is cheapest on Boston to San Diego including all fees?
- American Airlines has the lowest median fare on Boston to San Diego at USD 243 (median across 57 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Boston–San Diego flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 239. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Boston to San Diego routes?
- Boston to San Diego has 8 airlines competing, creating a price range from USD 158 to USD 752 across 215 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
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