It will depend on starting and ending points. For instance, a flight between say, Orlando (FL) and Cancun will cost about $300 (round trip). A flight between Seattle (WA) and Mexico City is on the order of $470 (again, round trip).
If you are asking for flights outside the US, price will increment according to distance flown. For example, round ticket from London to Mexico City is about $1,300 while a flight from New Delhi (India) to Mexico City will cost some $1,800.
It is about 6 or more hours to fly to Mexico
Yes, as a green card holder, you can fly to Mexico.
You can fly to Mexico, but, you won't be able to fly back to the US.
No, you cannot fly from Tijuana to Mexico without a passport.
Yes, children need a passport to fly to Mexico.
Yes, children need passports to fly to Mexico.
Yes, minors need a passport to fly to Mexico.
get plane tickets and fly to mexico
No.
You will need a pilots license, ID/passport to fly into Canada or Mexico.
No, you cannot fly within Mexico in 2016 without a passport.
No, you cannot fly within Mexico in 2017 without a passport.