i believe you can as long as you put the right amount of postage on.
i have sent a letter to the UK, and it takes 2 stamps.
It depends upon the weight of the letter.
56p
a normal letter costs 97p from the UK to Columbia
i send postcode of uk in kohat
The cost to send a letter from Austin, Texas to Surrey, UK would be $1.15. You can either add 3 regular stamps or you could have them add the postage at the post office to save about 32 cents.
about £2
If in any doubt, take the letter to a post office. In the UK, apart from the weight, the size and thickness of the envelope can influence the final cost of postage.
It will cost you 98 cents for an ordinary up to 1-ounce letter.
$1.20
The standard postage from the United States to the UK is about .94 cents. This varies slightly with the weight of the letter.