Go through your results for flights to Oaxaca in Mexico with Netflights. Although British Airways usually has the best prices, it's best to double check what's available for your travel dates.
If these flights are too expensive, try searching for a different time of year. So if your dates are flexible, consider looking at different times of year.
Today alone, we've compared 15 flights worldwide, so you're bound to find one that works for you. Look out for flights with British Airways, as they often have good deals. Or broaden your search by looking at other airports in Mexico.
For even more options, check what other airports you could fly to Oaxaca from. You might be able to make a saving by going from a different airport or city.