$105 Find Cheap Flights from Harlingen to Seattle - Compare and Save

In the last 5 days, the lowest price for a flight from Harlingen to Seattle was $105 for a one-way ticket and $257 for a round-trip.

Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

We unfortunately don’t have that data for this specific route.

Star Alliance, and oneworld are the airline alliances operating flights between Harlingen and Seattle, with Star Alliance being the most commonly used for this route.

The two airlines most popular with KAYAK users for flights from Harlingen to Seattle are Southwest and United Airlines. With an average price for the route of $423 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $397 and an overall rating of 7.4.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Harlingen to Seattle.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Harlingen is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Harlingen with another airline. Booking your flights between Harlingen and SEA can sometimes prove cheaper using this method.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Harlingen up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.