June is the cheapest month to fly this route, with average fares around $231 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $235 | $214 | Peak | |
| June 2026 | $231 | $210 | Best | |
| July 2026 | $233 | $210 | ||
| August 2026 | $232 | $210 |
Departing on Wednesday offers the lowest average fares at $213. Sunday departures are the most expensive at $248, a difference of $35.
The best time to fly is June. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Seattle to Phoenix is June, with average round-trip fares around $231. The lowest fare found in June is $210.
Wednesday departures are the cheapest, averaging $213 round trip. The most expensive day is Sunday at $248.
Based on current pricing trends, booking for June travel offers the best value. Avoid May if possible, as fares average $235 compared to $231 in the cheapest month. July is a solid middle-ground option at $233.
Flying in June instead of May can save you approximately $4 per round trip. The cheapest month averages $231 while the most expensive averages $235.
Airlines, flight times, price calendar, and more for Seattle to Phoenix
View SEA → PHX Details