July is the cheapest month to fly this route, with average fares around $365 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $409 | $361 | ||
| June 2026 | $477 | $359 | Peak | |
| July 2026 | $365 | $340 | Best | |
| August 2026 | $439 | $373 |
Departing on Wednesday offers the lowest average fares at $402. Friday departures are the most expensive at $440, a difference of $38.
The best time to fly is July. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Seattle to Mexico City is July, with average round-trip fares around $365. The lowest fare found in July is $340.
Wednesday departures are the cheapest, averaging $402 round trip. The most expensive day is Friday at $440.
Based on current pricing trends, booking for July travel offers the best value. Avoid June if possible, as fares average $477 compared to $365 in the cheapest month. August is a solid middle-ground option at $439.
Flying in July instead of June can save you approximately $112 per round trip. The cheapest month averages $365 while the most expensive averages $477.
Airlines, flight times, price calendar, and more for Seattle to Mexico City
View SEA → MEX Details