Sentencing the 30-year-old, Judge Alistair McCreath, told him:
I am going to sentence you under the name of Stephen Lennon although I suspect that is not actually your true name, in the sense that it is not the name that appears on your passport.
You knew perfectly well that you were not welcome in the United States.
You knew that because you tried before and you had not got in, and you knew the reason for that - because, rightly or wrongly, the US authorities do not welcome people in their country who have convictions of the kind that you have.
With that full knowledge, you equipped yourself with a passport. I am told that it was given you by way of a loan from your friend Andrew McMaster, to which you bore, I am told, some resemblance.
I am told that, by whatever means, you slipped away from the US authorities, got into the country and then very rapidly - and understandably so - got out of it.
The court heard that Lennon, who had previously been refused entry to the US, used his friend's passport to travel to the country in September.He used a self check-in kiosk to board the Virgin Atlantic flight at Heathrow, and was allowed through when the document was checked in the bag drop area.
But when he arrived at New York's JFK Airport, customs officials who took his fingerprints realised he was not Mr McMaster.
Lennon was asked to attend a second interview but left the airport, entering the US illegally.
He stayed just one night and travelled back to the UK the following day using his own legitimate passport - which bears the name Paul Harris.
The court heard that is the name that appears on the EDL leader's passport, although he uses aliases.
English Defence League (EDL) leader Stephen Lennon, 30, pleaded guilty to possession of a false identity document with improper intention, contrary to the Identity Documents Act 2010, at Southwark Crown Court.
Lennon used a passport in the name of Andrew McMaster to board a Virgin Atlantic Flight from Heathrow to New York, but was caught out after his fingerprints were taken by customs officials.
He left the airport and entered the US illegally but left the country the following day, using his own passport to return to the UK.