Travel from late October through early April, excluding peak holiday travel in late December and early January. The return flight from Paris must be November 1, or later.
This is a rare deal to Europe that is valid for travel on any day of the week, when available, and it's pretty easy to find available travel dates. On the San Francisco service, you'll have the best luck finding dates from early December onwards.
As an example, I found tickets at this price departing San Francisco SFO on Thursday, January 23, returning from Paris CDG on January 30, 2020.
This Basic Economy or Economy Light fare includes a carry-on bag plus a small personal item. A checked bag costs $60 each way.
Seats will be assigned at random upon check-in for this price. You may be able to pay a fee to choose a specific seat.
A Main Cabin Economy fare is $408 roundtrip, which includes one free checked bag, advanced seat assignments, and allows ticket changes/upgrades for a fee.
Related: Today's Best Flight Deals to Europe
See our New York fare details for booking info.
See our San Francisco fare details for booking info.
Need a room with an Eiffel Tower view? Hotelwatchdog will help you out with this list of accommodation deals for the dates mentioned.