Cheap flights from Washington to Philadelphia
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In 1682, the area was added to the Pennsylvania charter. Charles II of England repaid a debt owed to William Penn by offering him the charter which would come to be known as the Pennsylvania colony. In order to ensure peace and good relations with their neighbors, Penn also purchased the area from the local Delaware Indian tribe. According to legend, this purchase went hand-in-hand with a pact of friendship with the tribe.... (read more in our Philadelphia History)
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Check our newest flight offers to Philadelphia:
- $292
Spirit Airlines
cheapoair.com check priceFrom To Departure Time Seattle, WA (SEA) Philadelphia, PA (PHL) 06/24/2025 04:58 pm Philadelphia, PA (PHL) Seattle, WA (SEA) 07/02/2025 05:45 am - $295 Spirit Airlines
cheapoair.com check priceFrom To Departure Time Seattle, WA (SEA) Philadelphia, PA (PHL) 07/02/2025 04:58 pm Philadelphia, PA (PHL) Seattle, WA (SEA) 07/09/2025 05:45 am - $417
Sun Country Airlines
cheapoair.com check priceFrom To Departure Time Seattle, WA (SEA) Philadelphia, PA (PHL) 06/24/2025 12:10 pm Philadelphia, PA (PHL) Seattle, WA (SEA) 07/02/2025 12:05 pm - $574
Multiple Airlines
cheapoair.com check priceFrom To Departure Time Seattle, WA (SEA) Philadelphia, PA (PHL) 07/02/2025 11:59 pm Philadelphia, PA (PHL) Seattle, WA (SEA) 07/09/2025 12:37 pm
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