I would highly recommend creating a price alert on Skyscanner and Kayak to start tracking the price trends for this time period
The airport code for paris is PAR (this encompasses both parisian airports CDG and ORY)
Try not to book too early, and try not to wait till the last minute cause prices tend to be the worst during these time periods (There are a lot of different opinions about the ideal time to book an international flight)
From my experience for trips from the west coast for the summer period
600-900 : Good price for this time of year (summer is more expensive)
900-1200 : Normal price
1200-1500 : Pricy
To reduce costs
Don't fly direct
Play around with dates (weekends tend to be more expensive)
Accept a long layover
Check out the low cost companies like French Bee, but be careful of the added fees for simple services like food during the flight or checking a bag
If you don't mind paying a bit more for a more comfortable ride, Air France operates a lot of direct flights from major cities and is a pretty decent company (you also get free unlimited champagne)
Getting from the airport to Paris
DO NOT ride in a taxi which is not an official parisian taxi. When you get off the plane you will frequently have a bunch of people soliciting you proposing “taxi” services. Don’t choose those people, you will pay much more than you should.
Follow the signs in the airport to find a taxi stand. The prices to get to and from the airport are regulated and are as follows
55 € CDG to Paris right bank (north of the Seine river)
62 € CDG to Paris left bank (south of the Seine river)
41 € ORLY to Paris right bank (north of the Seine river)
35 € ORLY to Paris left bank (south of the Seine river)
Don’t accept to pay anything other than those prices since it is illegal to charge anything outside of those fees. Also, tipping isn’t an obligation, only if you had a fabulous experience.
Link to the website of G7 (the biggest taxi company in Paris) which allows you to book a taxi ahead of time (not necessary when departing from the airport to Paris).
Will probably be more expensive for a ride to/from the airport since they are not subject to the same regulations as the parisian taxis.