Question : Is there another way to get to Keflavik International Airport (KEF) besides London City Airport (LCY)?
Answer : London City Airport is a superb airport, but in getting you to Reykjavik, there is a lower cost option – London Heathrow Airport. It's just 22 miles away and flights are being priced 35% cheaper over the upcoming two months.
Question : How long do most people visit Reykjavik?
Answer : Of course you're not most people, but if you were, you'd stay roughly three days.
Question : Would you be willing to change your travel days if it saved you money?
Answer : For the month of March, Saturday is your lowest-cost day to fly. Having flexibility in your travel plans means you can save more, so be sure to plan ahead when possible.