Cheap flights from Harlingen, Texas to Seattle from $312
This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Harlingen, Texas to Seattle departing on 9/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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American Airlines flights from Harlingen, Texas to Seattle
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United Airlines flights from Harlingen, Texas to Seattle
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How to get the cheapest flight ticket from Harlingen, Texas to Seattle
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Seattle?
In general, February is the cheapest month to fly from Harlingen, Texas to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $263. If you don’t want to visit Seattle in February, then you should wait until March to fly from Harlingen, Texas, when ticket prices are also cheap, with an average price of $312.
What is the cheapest day to depart on your flight to Seattle?
On average, the least expensive day to fly to Seattle from Harlingen, Texas is on a Thursday. momondo users have found tickets for Thursday departures for as low as $355. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Harlingen, Texas because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $552.
What is the cheapest time of day to depart on your flight to Seattle?
Flying to Seattle from Harlingen, Texas in the morning is the least expensive time of day to depart. momondo users have found prices as low as $452 when looking at flights departing in the morning. Flights to Seattle are more costly at noon, with an average ticket price of $630. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.
How have Harlingen, Texas to Seattle flight prices changed over time?
When to book flights from Harlingen, Texas to Seattle
Cheap Harlingen, Texas to Seattle (HRL to SEA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Harlingen, Texas to Seattle
How far is Harlingen Valley Intl to Seattle/Tacoma Intl by plane?
The distance between Harlingen Valley Intl and Seattle/Tacoma Intl is about 1992.5 mi. In terms of flight time, this usually takes a little over 6h 44m.
When did momondo last update prices for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?
As of July 2025, there are 4 operators available to choose from for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Harlingen, Texas to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Harlingen, Texas to Seattle is American Airlines (51% of total bookings). The next most popular airlines are United Airlines (22%), Southwest (18%), and Delta (10%).
Best airlines flying from Harlingen, Texas to Seattle
Compare and see reviews for airlines that fly from Harlingen, Texas to Seattle with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $187 | Free Cancellation | Rating 8.0 7,975 reviews | |||
| PriceFrom $251 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $278 | Free Cancellation | Rating 7.4 8,858 reviews | |||
| PriceFrom $329 | Free Cancellation | Rating 8.0 4,272 reviews |
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Why should I use momondo to find a flight deal from Harlingen to Seattle?
It is quick and easy to find Harlingen to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.
Can I find flights from Harlingen to Seattle with flexible booking policies on momondo?
Flights from Harlingen to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Harlingen to Seattle?
Once all potential Harlingen to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Harlingen to Seattle right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Harlingen to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.