Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE betfront ( year number, datetime time, country text, competion text, match text, home_opening number, draw_opening number, away_opening number, home_closing number, draw_closing number, away_closing number )
TABLE: CREATE TABLE football_data ( season text, datetime time, div text, country text, league text, referee text, hometeam text, awayteam text, fthg number, ftag number, ftr text, hthg number, htag number, htr text, psh number, psd number, psa number, b365h number, b365d number, b365a number, lbh number, lbd number, lba number, bwh number, bwd number, bwa number )

### Question ###
What is the away team against Omiya Ardija in 2018?

### Accurate SQL ###

SELECT awayteam FROM football_data WHERE hometeam = "Omiya Ardija" AND season LIKE "%2018%"