Delta Flight 3688 Deals & Information (2026/2027)

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Delta Flight 3688 Route Deals From $70

The cheapest prices found with in the last 7 days for return flights were $99 and $70 for one-way flights to Boise for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Mar 13 - Mon, Mar 23
SEA
Seattle - Tacoma Intl.
BOI
Boise
$99 Roundtrip, found 22 hours ago
$99
Roundtrip
found 22 hours ago
Select Delta flight, departing Fri, Mar 13 from Seattle - Tacoma Intl. to Boise, returning Mon, Mar 23, priced at $99 found 22 hours ago
Fri, Apr 3 - Mon, Apr 6
SEA
Seattle - Tacoma Intl.
BOI
Boise
$142 Roundtrip, found 23 hours ago
$142
Roundtrip
found 23 hours ago
Select Delta flight, departing Fri, Apr 3 from Seattle - Tacoma Intl. to Boise, returning Mon, Apr 6, priced at $142 found 23 hours ago
Thu, Mar 5 - Sun, Mar 8
SEA
Seattle - Tacoma Intl.
BOI
Boise
$160 Roundtrip, found 3 days ago
$160
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Mar 5 from Seattle - Tacoma Intl. to Boise, returning Sun, Mar 8, priced at $160 found 3 days ago