Delta Flight DL4021 Deals & Information (2025/2026)

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Delta Flight 4021 Route Deals From $160

The cheapest prices found with in the last 7 days for return flights were $259 and $160 for one-way flights to Boise for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Aug 16 - Thu, Aug 21
SLC
Salt Lake City Intl.
BOI
Boise
$259 Roundtrip, found 2 days ago
$259
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Aug 16 from Salt Lake City Intl. to Boise, returning Thu, Aug 21, priced at $259 found 2 days ago
Sat, Aug 16 - Thu, Aug 21
SLC
Salt Lake City Intl.
BOI
Boise
$279 Roundtrip, found 2 days ago
$279
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Aug 16 from Salt Lake City Intl. to Boise, returning Thu, Aug 21, priced at $279 found 2 days ago
Tue, Jul 8 - Tue, Jul 15
SLC
Salt Lake City Intl.
BOI
Boise
$285 Roundtrip, found 22 hours ago
$285
Roundtrip
found 22 hours ago
Select Delta flight, departing Tue, Jul 8 from Salt Lake City Intl. to Boise, returning Tue, Jul 15, priced at $285 found 22 hours ago
Sun, Sep 28 - Fri, Oct 3
SLC
Salt Lake City Intl.
BOI
Boise
$291 Roundtrip, found 3 days ago
$291
Roundtrip
found 3 days ago
Select Delta flight, departing Sun, Sep 28 from Salt Lake City Intl. to Boise, returning Fri, Oct 3, priced at $291 found 3 days ago
Fri, Jul 11 - Sun, Jul 13
SLC
Salt Lake City Intl.
BOI
Boise
$305 Roundtrip, found 9 hours ago
$305
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Jul 11 from Salt Lake City Intl. to Boise, returning Sun, Jul 13, priced at $305 found 9 hours ago
Sat, Aug 16 - Thu, Aug 21
SLC
Salt Lake City Intl.
BOI
Boise
$319 Roundtrip, found 2 days ago
$319
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Aug 16 from Salt Lake City Intl. to Boise, returning Thu, Aug 21, priced at $319 found 2 days ago
Mon, Aug 18 - Wed, Aug 20
SLC
Salt Lake City Intl.
BOI
Boise
$323 Roundtrip, found 6 days ago
$323
Roundtrip
found 6 days ago
Select Delta flight, departing Mon, Aug 18 from Salt Lake City Intl. to Boise, returning Wed, Aug 20, priced at $323 found 6 days ago
Sat, Aug 16 - Thu, Aug 21
SLC
Salt Lake City Intl.
BOI
Boise
$327 Roundtrip, found 2 days ago
$327
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Aug 16 from Salt Lake City Intl. to Boise, returning Thu, Aug 21, priced at $327 found 2 days ago
Fri, Jul 11 - Sun, Jul 13
SLC
Salt Lake City Intl.
BOI
Boise
$367 Roundtrip, found 9 hours ago
$367
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Jul 11 from Salt Lake City Intl. to Boise, returning Sun, Jul 13, priced at $367 found 9 hours ago
Fri, Jul 11 - Sun, Jul 13
SLC
Salt Lake City Intl.
BOI
Boise
$377 Roundtrip, found 9 hours ago
$377
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Jul 11 from Salt Lake City Intl. to Boise, returning Sun, Jul 13, priced at $377 found 9 hours ago
Fri, Jul 11 - Sun, Jul 13
SLC
Salt Lake City Intl.
BOI
Boise
$420 Roundtrip, found 9 hours ago
$420
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Jul 11 from Salt Lake City Intl. to Boise, returning Sun, Jul 13, priced at $420 found 9 hours ago
Fri, Jul 11 - Sun, Jul 13
SLC
Salt Lake City Intl.
BOI
Boise
$426 Roundtrip, found 9 hours ago
$426
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Jul 11 from Salt Lake City Intl. to Boise, returning Sun, Jul 13, priced at $426 found 9 hours ago