Main Difference
The main difference between Quiche and Flan is that the Quiche is a savoury open pastry tart with a filling of egg, dairy and other ingredients and Flan is a open pie.
Quiche
Quiche ( KEESH) is a savoury dish consisting of pastry crust filled with eggs, milk or cream, and cheese, meat, seafood or vegetables. Quiche can be served hot or cold. It is part of French cuisine but is also popular in other countries, particularly as party food.
Flan
A flan, in English and other cuisines, is a dish with an open, rimmed pastry or sponge base containing a sweet or savory filling. Examples are the quiche lorraine, custard tart, leche flan, and the South African melktert.
Quiche (noun)
A pie made primarily of eggs and cream in a pastry crust. Other ingredients such as chopped meat or vegetables are often added to the eggs before the quiche is baked.
Flan (noun)
Baked tart with sweet or savoury filling in an open-topped pastry case. Compare quiche.
Flan (noun)
A dessert of congealed custard, often topped with caramel, especially popular in Spanish-speaking countries.
Flan (noun)
A coin die
Flan (noun)
A fan of U.S. TV series Firefly; a Browncoat.
Flan (noun)
a baked dish consisting of an open-topped pastry case with a savoury or sweet filling
“an egg and bacon flan”
“a fluted flan tin”
Flan (noun)
a sponge base with a sweet topping.
Flan (noun)
a disc of metal such as one from which a coin is made.