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The blue colour on the Union Flag is from the Scottish Saltire.
The colors that are in the flag that represents the United Kingdom are red, white, and blue. These colors are set in a pattern that is called the Union Jack, which is one cross shape set on top of other.
The Union Flag commonly known as the Union Jack is the blue, white and red flag of the UK.
Red, White and Blue. It is known as the Union Flag, or sometimes erroneously as the Union Jack.
It is representing the Scotland flag on the Union Jack.
There are several blue, white and red flags, the Union Flag (Union Jack) is blue , white and red flag of the UK, as is the Australian flag, the New Zealand flag and the US flag which also known as the Stars and Stripes.
Australia's flag is predominantly blue, with red and white on the Union Jack, and white stars.
Union jack and the southern cross. Blue , white, red
The 'Union Jack' has three colours: Red, White and Blue.
The Union Jack (Union Flag) is in the upper left-hand corner of the Australia flag. "The Union Jack itself is a composite flag symbolizing the union of the historical components of the United Kingdom. It is composed of intersecting and overlayed red and white vertical and diagonal crosses on blue and white background." Source: http://www.anbg.gov.au/oz/flag-union.html
blue with tht union jack and 4 red stars
The red follows from the flag of St. George, which is a red cross on a white background.