Cheap flights from Harlingen to Seattle

One-way fares from $306 · HRL → SEA · prices found by travellers in the last 48 hours

Compare all dates Seattle → Harlingen
Cheapest fare
$306

Southwest Airlines · Thu, Nov 12

Cheapest month
November

from $306

Direct flights
Not recently

Usually 1+ stop

Quickest trip
9h 30m

3,210 km

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Cheapest month to fly from Harlingen to Seattle

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 Cheapest $306

Cheapest dates in November 2026

The lowest fares we've seen for each day, cheapest first.

Southwest Airlines
Depart05:50 Thu, Nov 12HRL → SEA 9h 30m · 1 stop
$306one way, per person
View deal
See every date in November 2026 →

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About flights from Harlingen to Seattle

Harlingen (HRL) and Seattle (SEA) are about 3,210 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 9h 30m. Over the next few months, one-way fares start from $306, and November 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from Harlingen to Seattle?

The cheapest one-way fare we've seen recently is $306 with Southwest Airlines, departing Thursday, November 12, 2026.

What is the cheapest month to fly from Harlingen to Seattle?

November 2026 currently has the lowest fares, from $306 one way.

Are there direct flights from Harlingen to Seattle?

We haven't seen direct fares recently, so most journeys include at least one stop.

How long is the flight from Harlingen to Seattle?

The quickest journey we've seen takes about 9h 30m. Harlingen and Seattle are around 3,210 km apart.

Which airlines fly from Harlingen to Seattle?

Recent fares on this route were with Southwest Airlines.

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