Alaska AirlinesDepart20:46
Mon, Dec 21SAN → BOS
5h 42m · Direct
$100one way, per person
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- Cheapest fare
- $100
- Cheapest month
- December
- Direct flights
- Yes
- Flight time
- 5h 42m
Alaska Airlines · Mon, Dec 21
from $100
Alaska Airlines
4,150 km
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Cheapest month to fly from San Diego to Boston
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in December 2026
The lowest fares we've seen for each day, cheapest first.
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Where to stay, what to do and getting around, from our travel partners.
About flights from San Diego to Boston
San Diego (SAN) and Boston (BOS) are about 4,150 km apart. Direct flights take around 5h 42m, and recent direct fares were with Alaska Airlines. Over the next few months, one-way fares start from $100, and December 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from San Diego to Boston?
The cheapest one-way fare we've seen recently is $100 with Alaska Airlines, departing Monday, December 21, 2026. Over the coming months, the lowest fare in each month ranges from $100 to $198.
What is the cheapest month to fly from San Diego to Boston?
December 2026 currently has the lowest fares, from $100 one way.
Are there direct flights from San Diego to Boston?
Yes. Recent direct fares were with Alaska Airlines.
How long is the flight from San Diego to Boston?
A direct flight takes about 5h 42m. San Diego and Boston are around 4,150 km apart.
Which airlines fly from San Diego to Boston?
Recent fares on this route were with Southwest Airlines, Alaska Airlines and United Airlines.
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