Here we have a great guide that we found in the vexillology category of Reddit that features the flags for the different autonomous regions of Spain for you to check out.
And here we have decent pictures of the Spanish flags in the guide along with Information about them courtesy of Wikipedia with links to where you can find more.
Flag of Andalusia
The official flag of Andalusia consists of three equal horizontal stripes, coloured green, white, and green respectively; the Andalusian coat of arms is superimposed on the central stripe. (More info)
Flag of Aragon
The current flag was approved in 1984, with the provisions of Article 3 of the Statute of Autonomy of Aragon, the flag is the traditional of the four horizontal red bars on a yellow background with the coat of arms of Aragon shifted towards the flagpole. (More info)
Flag of the Balearic Islands
The flag of the Balearic Islands is the official flag of the Balearic Islands, an archipelago and autonomous community of Spain located in the western Mediterranean Sea. The flag, which was adopted in the 1983 Statute of Autonomy, incorporates the design of the Senyera. (More info)
Flag of Catalonia
The Senyera is a vexillological symbol based on the coat of arms of the Crown of Aragon and the Principality of Catalonia, which consists of four red stripes on a yellow field. This coat of arms, historically represented the Count of the County of Barcelona. (More info)
Flag of the Valencian Community
The flag of the Valencian Community and of the city of Valencia, is the traditional Senyera, composed of four red bars on a yellow background, crowned with a blue strip party per pale next to the hoist. It was adopted on 1 July 1982. (More info)
Flag of Navarre
The flag of Navarre, the flag of the autonomous community of Navarre, was designed in 1910 by Arturo Campión, Julio Altadill, and Hermilio de Oloriz. The flag of Navarre is red, with the coat of arms in the centre. (More info)
Flag of the Region of Murcia
The flag of the Region of Murcia is rectangular and consists of four castles with battlements, in the upper left corner, arranged in rows of two, and seven royal crowns in the lower right corner, against a crimson or carmine red background. (More info)
Flag of La Rioja
The flag of La Rioja, consists of four horizontal bands of equal size, with the colours of red, white, green, and yellow. In addition, and similar to the Flag of Spain, a coat of arms can be featured in the centre of the flag, specifically the coat of arms of La Rioja. (More info)
Flag of Galicia
The flag of Galicia appeared for first time in the 19th century, probably based on the colours of the ancient medieval flags of the Kingdom of Galicia. The flag is a white field with a blue band crossing it from the top-left corner to the bottom-right with the Galician coat of arms. (More info)
Flag of Basque Country
The flag of the Basque Country is the official flag of the Basque Country Autonomous Community of Spain and was adopted in 1936. This flag consists of a white cross over a green saltire on a red field. (More info)
Flag of Castile
The Kingdom of Castile was a polity in the Iberian Peninsula during the Middle Ages. It traces its origins to the 9th-century County of Castile as an eastern frontier lordship of the Kingdom of León. (More info)
Flag of Castile and León
The flag of Castile and León is the official flag of the Spanish autonomous community of Castile and León which was adopted in 1983. It consists of the quartered coats of arms of Castile, represented by a castle, and León, represented by a lion. (More info)
Flag of Castilla–La Mancha
The flag of Castilla–La Mancha is one of the representative symbols of the Autonomous Community of Castilla–La Mancha, in Spain, defined by its Statute of Autonomy. The flag was adopted on the 10th of August 1986. (More info)
Flag of Cantabria
The flag of the Spanish region of Cantabria is made up of two horizontal stripes of equal width, white on the top and red on the bottom, and the region's coat of arms in its centre. The flag was adopted on the 30th of December 1981. (More info)
Flag of the Community of Madrid
The flag of the Community of Madrid is crimson red, with seven five-pointed stars in white, placed four and three in the centre of the field. The crimson colour stands for Castile as Madrid has been historically Castillian and the stars represent each of the administrative areas of the province of Madrid. (More info)
Flag of Asturias
The flag of Asturias is a blue field with a yellow Cruz de la Victoria (English: Victory Cross) shifted towards the hoist. It has served as one of the symbols of Asturias since the late 18th century. (More info)
State Flag of Extremadura
The flag of Extremadura, according to Article 4-1 of the Statute of Autonomy, consists of three horizontal stripes of green, white, and black. The state flag, used by Extremadura's government and administration, must use the variant with the coat of arms of the region off-centred toward the hoist. (More info)
State Flag of the Canary Islands
The flag of the Autonomous Community of the Canary Islands is a vertical tricolour of three equal bands of white, blue and yellow. The state flag includes the coat of arms of the Canary Islands in the central band; the civil flag omits this. (More info)
Flag of Ceuta
The flag of Ceuta is the flag of the Spanish city of Ceuta, consisting of a black and white gyronny with a central escutcheon displaying the municipal coat of arms. The civil flag omits the escutcheon. The flag was adopted on the 13th of March 1995. (More info)
Flag of Melilla
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The flag of Melilla, a Spanish enclave in North Africa, consists of a pale blue background with the city's coat of arms in the centre. The flag is adopted on 13 March 1995 when Melilla became an autonomous city of Spain. (More info)