August is the cheapest month to fly this route, with average fares around $145 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $175 | $142 | Peak | |
| June 2026 | $160 | $117 | ||
| July 2026 | $167 | $128 | ||
| August 2026 | $145 | $128 | Best |
Departing on Tuesday offers the lowest average fares at $143. Sunday departures are the most expensive at $187, a difference of $44.
The best time to fly is August. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Las Vegas to Seattle is August, with average round-trip fares around $145. The lowest fare found in August is $128.
Tuesday departures are the cheapest, averaging $143 round trip. The most expensive day is Sunday at $187.
Based on current pricing trends, booking for August travel offers the best value. Avoid May if possible, as fares average $175 compared to $145 in the cheapest month. July is a solid middle-ground option at $167.
Flying in August instead of May can save you approximately $30 per round trip. The cheapest month averages $145 while the most expensive averages $175.
Airlines, flight times, price calendar, and more for Las Vegas to Seattle
View LAS → SEA Details