Here is an excellent guide that we found on Reddit which features different types of red and white country flags from around the world for you to check out which are listed in alphabetical order.
(Please note that Hong Kong is no longer a country)
And here we have some high quality pictures of the flags in the guide along with a little bit of information about them for you to read from Wikipedia and links to where you can find more.
Flag of Austria
The Austrian flag is considered one of the oldest national symbols still in use by a modern country, with its first recorded use in 1230. The Austrian triband originated from the arms of the Babenberg dynasty. (More Info)
Flag of Bahrain
The five white triangles symbolise the five pillars of Islam, the red on the flag represents the blood of the martyrs and the battles of Bahrain and the white represents peace. (More info)
Flag of Canada
The National Flag of Canada consists of a red field with a white square at its centre in the ratio of 1∶2∶1, in which is featured one stylised, red, 11-pointed maple leaf charged in the centre. (More info)
Flag of Denmark
The flag of Denmark is red with a white Nordic cross, which means that the cross extends to the edges of the flag and that the vertical part of the cross is shifted to the hoist side. (More info)
Flag of England
The flag of England is the national flag of England, a constituent country of the United Kingdom. It is derived from Saint George's Cross and was a component in the design of the Union Jack in 1606. (More info)
Flag of Georgia
Also known as the Five-Cross Flag was originally a banner of the medieval Kingdom of Georgia, it was repopularised in the late 20th and early 21st centuries during the Georgian national revival. (More info)
Flag of Greenland
Designed by Thue Christiansen and features two equal horizontal bands of white (top) and red (bottom) with a counter-changed red-and-white disk slightly to the hoist side of centre. (More info)
Flag of Hong Kong (Not a country)
The Regional Flag of the Hong Kong depicts a white stylised five-petal Hong Kong orchid tree flower in the centre of a Chinese red field. (More info)
Flag of Indonesia
The national flag of Indonesia is a simple bicolour with two horizontal bands, red (top) and white (bottom) with an overall ratio of 2:3. (More info)
Flag of Japan
The national flag of Japan is a rectangular white banner with a red circle at its centre. The flag is officially called the Nisshōki but is more commonly known in Japan as the Hinomaru. (More info)
Flag of Latvia
The national flag of Latvia was used by independent Latvia from 1918 until the country was occupied by the Soviet Union in 1940. Its use was suppressed during Soviet rule and on 27 February 1990, the Latvian government re-adopted the traditional red-white-red flag. (More info)
Flag of Malta
The flag of Malta is a bicolour, with white in the hoist and red in the fly. A representation of the George Cross, awarded to Malta by George VI in 1942, is carried, edged with red, in the canton of the white stripe. (More info)
Flag of Monaco
The national flag of Monaco has two equal horizontal bands, of red (top) and white (bottom), both of which have been the heraldic colours of the House of Grimaldi since at least 1339. (More info)
Flag of Peru
The Flag of Peru, often referred to as The Bicolour, was adopted by the government of Peru in 1825, and modified in 1950. It is a vertical triband with red outer bands and a single white middle band. (More info)
Flag of Poland
The national flag of Poland consists of two horizontal stripes of equal width, the upper one white and the lower one red. The two colours are defined in the Polish constitution as the national colours. (More info)
Flag of Qatar
The flag of Qatar is maroon with a broad white serrated band (nine white points) on the hoist side. It was adopted shortly before the country declared independence from the United Kingdom on 3 September 1971. (More info)
Flag of Singapore
The design is a horizontal bicolour of red above white, overlaid in the canton (upper-left quadrant) by a white crescent moon facing a pentagon of five small white five-pointed stars. (More info)
Flag of Switzerland
The national flag of Switzerland displays a white Greek cross in the center of a square red field. The white cross is known as the Swiss cross or the federal cross. (More info)
Flag of Tonga
The national flag of Tonga consists of a red field with a white canton charged with a red couped cross. Adopted in 1875 after being officially enshrined into the nation's constitution, it has been the flag of the Kingdom of Tonga since that year. (More info)
Flag of Tunisia
The national flag of Tunisia is a rectangular panel of red colour with an aspect ratio of 2:3. In the centre of the cloth in a white disk is placed a red crescent, surrounding a red five-pointed star on three sides. (More info)
Flag of Turkey
The national flag of Turkey, officially the Turkish flag, is a red flag featuring a white crescent and star on its emblem, based on the 18th-century Ottoman Empire flag. (More info)