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North America
Chicago
USA · ORD · 2,936.86 km from SF (via SJC)
Est. Sep 2026
$680
peak
Anything outside summer is cheap — February is darkest and cheapest.
Brutal lake-effect winters keep prices low for eight months of the year.
Ready to book?
Suggested cheapest window November 2026 · 2026-11-07 → 2026-11-15
Or search September 2026: 2026-09-07 → 2026-09-15
September 2026 is peak
Peak season. Expect premium fares, busy attractions, and the weather locals brag about.
Why this season?
- Weatherdrives prices upJun, Jul, Aug, SepLocally peak weather and tourism
Brutal lake-effect winters keep prices low for eight months of the year.
- Weatherdrives prices downJan, Feb, Mar, Apr, Nov, DecOff-season weather discounts
Quieter months driven by local climate; see the climate note for specifics.
Weather through the year
12-month fare curve
12-month estimated fare curve
Range $355 – $680
off-peak shoulder peak holiday spike
$355
$355
$355
$355
$450
$680
$680
$680
$680
$450
$355
$355
J
F
M
A
M
J
J
A
S
O
N
D
Cheapest month
December
~$355 · off-peak
Most expensive
September
~$680 · peak
Peak months
Jun, Jul, Aug, Sep
avoid these for budget