Question : How many days should you spend in London if you're flying in from Sioux Falls?
Answer : Over the next two months, travelers from FSD to LHR are planning on staying for 11 days on average.
Question : Is price more important than specific travel days for you?
Answer : Wednesday is your lowest-cost day to fly in February. Being flexible with your travel days garners you even more savings during your booking.
Question : Are prices changing frequently for this route?
Answer : Prices for FSD to LHR do fluctuate a lot more than the majority of routes. However, the sooner you book, the better price you tend to get.