AirHint found the following cheapest one-way flights from Philadelphia (PHL) to Boston (BOS) in October 2025 (see full year).

One-Way flights

05 Oct	Frontier Airlines	direct
09 Oct	Frontier Airlines	direct
12 Oct	Frontier Airlines	direct
16 Oct	Frontier Airlines	direct
19 Oct	Frontier Airlines	direct
23 Oct	Frontier Airlines	direct
26 Oct	Frontier Airlines	direct
02 Oct	Frontier Airlines	direct
03 Oct	Spirit Airlines
28 Oct	Spirit Airlines

Also check the deals for return flights from Philadelphia to Boston in October.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest one-way flights from Philadelphia to Boston in October from $49

One-Way flights