ua has e+ seats & ba has wt+ seats [but not w/i europe iirc]....do you have a max spend in mind?....good luck...

edit to add....i priced the trip using 2 weeks, tue-tue....& klm was about half of the other fares....ba didn't show up & ua is most likely a non starter....why don't you look at a general booking site [i used travelocity]....what are you looking to book that is your base?