Originally Posted by Guy Betsy
BA is currently really low fares ex-LGW to KEF. Might be worth your while to just buy a side-trip instead of trying to incorporate it into your xONE ticket. I bought an "I" ticket on BA which essentially cost about $130 more than the lowest Y ticket I could get for that time of the year. Nochanges of course.. but hey!
And for those who can still stand coach for a not-too-long segment, BA's cheapest one-way on the segment totals about $125 including taxes.