Cheap flights from Harrisburg to Seattle from $149

In general, January is the cheapest month to fly from Harrisburg to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $298. If you don’t want to visit Seattle in January, then you should wait until February to fly from Harrisburg, when ticket prices are also cheap, with an average price of $359.

You are more likely to see cheaper flights to Seattle from Harrisburg when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $431 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Harrisburg for as low as $305 on momondo.

You could potentially save up to 14% on your flight if you consider stops on a Harrisburg to Seattle flight.

As of May 2026, prices for Harrisburg to Seattle flights are approximately 2% cheaper when compared to flights at the same time last year.

United Airlines, Delta, and American Airlines are the most popular carriers operating from Harrisburg to Seattle/Tacoma Intl

Alaska Airlines, American Airlines and United Airlines are the top three most popular airlines that fly to Seattle from Harrisburg according to our data. Alaska Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 10 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Chicago (ORD) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Detroit (DTW) offer the lowest average round-trip price of $327.

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 7h 42m.

Detroit (DTW) has the shortest average layover time for this route: 1h 02m.