Seattle to Philadelphia in August 2026

Dated one-way fares from Seattle to Philadelphia in August 2026. Use the calendar to see which days are cheaper.

Lowest this month $138

Highest this month $201

Sample fare $138

Airports SEA–PHL

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August 2026 price calendar

From $138 · up to $201

Mon

Tue

Wed

Thu

Fri

Sat

Sun

27 $181 28 $159 29 $138 30 $181 31 $201

Philadelphia PHL

$138

Aug 29, 7:06pm · 7h 33m · 1 stop

SEA → PHL · Frontier Airlines

Philadelphia PHL

$181

Aug 27, 7:06pm · 7h 33m · 1 stop

SEA → PHL · Frontier Airlines

Philadelphia PHL

$181

Aug 30, 7:06pm · 7h 33m · 1 stop

SEA → PHL · Frontier Airlines

Philadelphia PHL

$201

Aug 31, 7:06pm · 7h 33m · 1 stop

SEA → PHL · Frontier Airlines

This page is only August 2026 on the Seattle to Philadelphia route. Open the full route if you want the next months side by side.

Prices move as seats sell. Confirm the live itinerary before you book Seattle to Philadelphia in August 2026.