The State We're In, Adele Parks

What are the odds that the stranger sitting next to you on a plane is destined to change your life? Especially when they appear to be your opposite in every way... 

Lucy Atkins Jo is a hopeless romantic. Worried she let her soulmate slip away, she's chasing her past all the way to Chicago to break up her ex-fiancé's wedding. Dean is a resolute cynic.

After a brief (but not brief enough) trip to London, he's returning to Chicago, where he moved to escape his dysfunctional past. In the time it takes to fly from London to Chicago, each finds something in the other that they didn't even realise they needed. But it's only when they get off the plane that their true journey begins...