UK and Europe
In the UK most language schools are accredited by the British Council. The minimum requirements for teachers to be employed at these schools is that they have a degree and Trinity or CELTA TEFL qualification. Schools are busier in the summer months so those teachers who are newly qualified will find it easier to find work at the beginning of summer. At this time many students come to the UK from Europe and Asia to participate is specially designed summer school programs.
Across Europe the situation is slightly different and employment opportunities are spread more evenly throughout the year. Schools generally teach to a high standard and usually expect teachers to have a degree plus Trinity or CELTA qualification.
In Asia schools almost always require teachers to hold a degree as this is a particular requirement for foreign nationals to obtain a work visa. However holding a CELTA or Trinity is not always necessary, although it may improve your chances of employment. Japan usually offers the highest salaries, and once you have your visa there is flexibility in working for different schools. In Korea the salary is less, but accommodation and travel costs are usually provided. Also the cost of living is less than in Japan so there is still plenty of opportunity to save money.
Africa and the Middle East
Generally the tefl jobs in these areas are the highest paying but also require the most experience. Employment opportunities in these areas are usually with oil/gas companies or at industrial training centres. Employers are usually looking for teachers with at least 5 years post CELTA/Trinity teaching experience and in some cases even a DELTA qualification.
South and Central America
TEFL jobs in these areas are generally lower paying than elsewhere in the world. There are opportunities in schools, colleges and private language schools. A CELTA or Trinity is not always a prerequisite for employment, and teachers look to South America more for a cultural experience rather than a money saving opportunity.