Delta Flight NH166 Deals & Information (2025/2026)

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Delta Flight 166 Route Deals From $1,010

The cheapest prices found with in the last 7 days for return flights were $644 and $1,010 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 8 - Thu, Sep 18
HND
Haneda
SEA
Seattle - Tacoma Intl.
$644 Roundtrip, found 1 day ago
$644
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Sep 8 from Haneda to Seattle - Tacoma Intl., returning Thu, Sep 18, priced at $644 found 1 day ago
Mon, Dec 15 - Thu, Jan 1
HND
Haneda
SEA
Seattle - Tacoma Intl.
$674 Roundtrip, found 3 days ago
$674
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Dec 15 from Haneda to Seattle - Tacoma Intl., returning Thu, Jan 1, priced at $674 found 3 days ago
Sat, Oct 4 - Wed, Oct 8
HND
Haneda
SEA
Seattle - Tacoma Intl.
$689 Roundtrip, found 5 days ago
$689
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Oct 4 from Haneda to Seattle - Tacoma Intl., returning Wed, Oct 8, priced at $689 found 5 days ago
Sun, Sep 7 - Thu, Sep 11
HND
Haneda
SEA
Seattle - Tacoma Intl.
$691 Roundtrip, found 5 days ago
$691
Roundtrip
found 5 days ago
Select Delta flight, departing Sun, Sep 7 from Haneda to Seattle - Tacoma Intl., returning Thu, Sep 11, priced at $691 found 5 days ago
Sat, Dec 20 - Thu, Jan 1
HND
Haneda
SEA
Seattle - Tacoma Intl.
$694 Roundtrip, found 3 days ago
$694
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Dec 20 from Haneda to Seattle - Tacoma Intl., returning Thu, Jan 1, priced at $694 found 3 days ago
Sat, Sep 6 - Fri, Sep 12
HND
Haneda
SEA
Seattle - Tacoma Intl.
$739 Roundtrip, found 1 day ago
$739
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Sep 6 from Haneda to Seattle - Tacoma Intl., returning Fri, Sep 12, priced at $739 found 1 day ago
Wed, Sep 10 - Sat, Sep 20
HND
Haneda
SEA
Seattle - Tacoma Intl.
$757 Roundtrip, found 5 hours ago
$757
Roundtrip
found 5 hours ago
Select Delta flight, departing Wed, Sep 10 from Haneda to Seattle - Tacoma Intl., returning Sat, Sep 20, priced at $757 found 5 hours ago
Wed, Sep 10 - Fri, Sep 19
HND
Haneda
SEA
Seattle - Tacoma Intl.
$769 Roundtrip, found 5 hours ago
$769
Roundtrip
found 5 hours ago
Select Delta flight, departing Wed, Sep 10 from Haneda to Seattle - Tacoma Intl., returning Fri, Sep 19, priced at $769 found 5 hours ago

Frequently asked questions

What route does flight number DL166 take?
Flight number DL166 operates direct from HND to Sea-Tac Airport. During this trip, expect to be in the air for 9 hours and 3 minutes. It pays to book ahead to lock in your favorite seat.
How often is DL166 on time?
Around 90% of DL166 flights arrive as scheduled — so if you're jetting from Tokyo Airport (HND-Haneda) to SEA, you can kick back knowing that you'll make it to your destination ASAP. If this Delta journey encounters a delay, you can expect to wait roughly 17 minutes. Thanks to the airline's exceptional service, this route has a 4.1-star rating.
What terminal does DL166 fly out of?
You'll likely be taking off from Terminal 3 if you're booked on flight number DL166 direct from Haneda Airport (HND) to SEA.
What kind of plane is on flight number DL166?
The route for DL166 is predominantly Tokyo Haneda Airport to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.), and the Airbus A330-900neo is the aircraft model you're likely to be flying with.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your DL166 flight with Travelocity, please visit our Customer Service Portal.