Delta Flight DL4021 Deals & Information (2025/2026)

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Delta Flight 4021 Route Deals From $180

The cheapest prices found with in the last 7 days for return flights were $269 and $180 for one-way flights to Boise for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 22 - Sat, Oct 4
SLC
Salt Lake City Intl.
BOI
Boise
$269 Roundtrip, found 10 hours ago
$269
Roundtrip
found 10 hours ago
Select Delta flight, departing Mon, Sep 22 from Salt Lake City Intl. to Boise, returning Sat, Oct 4, priced at $269 found 10 hours ago