So, the Dollar remained pretty steady throughout January with it hitting a low on 24th January. The best rate available rate that day was from Travel FX and was £1/$1.401. At the moment (1st Feb) its sitting at £1/$1.409.
You can see the graph below showing the movement over the last 18 months with a steady downward trend.
Holiday sales to the US appear to be a little lower too, with many travel companies offering sales and special rates even now, whereas in 2014 and 2015 some of them stopped in January.
Hopefully the low oil prices will see flight prices drop which will make it cheaper to get to america, even if things are slightly more expensive when you are there.
See the current Best US Dollar Rates.