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North America
Boston
USA · BOS · 4,316.221 km from SF (via SJC)
Est. Dec 2026
$290
off-peak
Shoulder-spring and deep winter are the only times Boston is cheap.
Fall foliage drives the September–October spike; winters are brutal.
Ready to book?
Suggested cheapest window December 2026 · 2026-12-07 → 2026-12-15
Or search December 2026: 2026-12-07 → 2026-12-15
December 2026 is off-peak
This is the cheap, quiet window. Expect lower fares, fewer crowds, and occasionally softer weather.
Why this season?
- Weatherdrives prices downJan, Feb, Mar, Apr, DecOff-season weather discounts
Quieter months driven by local climate; see the climate note for specifics.
- Weatherdrives prices upJun, Jul, Aug, Sep, OctLocally peak weather and tourism
Fall foliage drives the September–October spike; winters are brutal.
Weather through the year
12-month fare curve
12-month estimated fare curve
Range $290 – $555
off-peak shoulder peak holiday spike
$290
$290
$290
$290
$370
$555
$555
$555
$555
$555
$370
$290
J
F
M
A
M
J
J
A
S
O
N
D
Cheapest month
December
~$290 · off-peak
Most expensive
October
~$555 · peak
Peak months
Jun, Jul, Aug, Sep, Oct
avoid these for budget