Fares shown are modelled estimates, not live quotes.
Other budgets from San Diego:
Lowest Route Estimates from San Diego Under $400
Sorted by modelled price estimate, not live fare data.
How to Find Flights Under $400 from San Diego
Book 6–10 weeks in advance
This is typically the sweet spot for international fares from San Diego. Too early and airline seats aren't discounted yet; too late and inventory is tight. The $400 threshold is easiest to hit in shoulder season.
Fly mid-week
Compare Tuesday and Wednesday departures from San Diego with weekend dates before booking.
Join the weekly fare email
Sign up for the weekly cheapest-fare email, or save a route from San Diego with your target price and we check it daily.
Frequently Asked Questions
Are there really international flights from San Diego under $400?
22 routes from San Diego have modelled round-trip estimates at or below $400. These are based on route distance and region, not live or historical fares.
When is the best time to find flights from San Diego under $400?
Shoulder seasons (April–May, September–October) can offer lower prices. Compare mid-week departures and nearby dates before booking.
What is the cheapest destination from San Diego?
Based on modelled estimates, Los Cabos is one of the lowest estimated routes from San Diego at around $68 round trip. This is not a live fare.
Get weekly fares from San Diego
Sign up for the weekly cheapest-fare email. Want a specific route watched? Save it with a target price and we check it daily.
Get My Weekly Fare Email