United Flight 3689 Deals & Information (2026/2027)

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United Flight 3689 Route Deals From $147

The cheapest prices found with in the last 7 days for return flights were $293 and $147 for one-way flights to Lambert-St. Louis Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Nov 10 - Wed, Nov 11
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$293 Roundtrip, found 1 day ago
$293
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 10 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Wed, Nov 11, priced at $293 found 1 day ago
Tue, Nov 10 - Wed, Nov 11
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$303 Roundtrip, found 1 day ago
$303
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 10 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Wed, Nov 11, priced at $303 found 1 day ago
Tue, Nov 10 - Wed, Nov 11
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$309 Roundtrip, found 1 day ago
$309
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 10 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Wed, Nov 11, priced at $309 found 1 day ago
Tue, Nov 10 - Thu, Nov 12
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$315 Roundtrip, found 2 days ago
$315
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 10 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Thu, Nov 12, priced at $315 found 2 days ago
Tue, Nov 10 - Thu, Nov 12
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$319 Roundtrip, found 2 days ago
$319
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 10 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Thu, Nov 12, priced at $319 found 2 days ago
Mon, Feb 15 - Thu, Feb 18
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$319 Roundtrip, found 4 days ago
$319
Roundtrip
found 4 days ago
Select United flight, departing Mon, Feb 15 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Thu, Feb 18, priced at $319 found 4 days ago
Tue, Dec 8 - Sat, Dec 12
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$322 Roundtrip, found 5 days ago
$322
Roundtrip
found 5 days ago
Select United flight, departing Tue, Dec 8 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Sat, Dec 12, priced at $322 found 5 days ago
Sat, Nov 21 - Mon, Nov 23
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$323 Roundtrip, found 5 days ago
$323
Roundtrip
found 5 days ago
Select United flight, departing Sat, Nov 21 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Mon, Nov 23, priced at $323 found 5 days ago
Thu, Nov 12 - Fri, Nov 13
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$327 Roundtrip, found 2 days ago
$327
Roundtrip
found 2 days ago
Select United flight, departing Thu, Nov 12 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Fri, Nov 13, priced at $327 found 2 days ago
Tue, Dec 8 - Sat, Dec 12
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$328 Roundtrip, found 5 days ago
$328
Roundtrip
found 5 days ago
Select United flight, departing Tue, Dec 8 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Sat, Dec 12, priced at $328 found 5 days ago
Mon, Feb 15 - Thu, Feb 18
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$329 Roundtrip, found 4 days ago
$329
Roundtrip
found 4 days ago
Select United flight, departing Mon, Feb 15 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Thu, Feb 18, priced at $329 found 4 days ago
Thu, Nov 12 - Fri, Nov 13
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$331 Roundtrip, found 2 days ago
$331
Roundtrip
found 2 days ago
Select United flight, departing Thu, Nov 12 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Fri, Nov 13, priced at $331 found 2 days ago
Tue, Nov 10 - Thu, Nov 12
EWR
Newark Liberty Intl. Airport
STL
Lambert-St. Louis Intl.
$333 Roundtrip, found 2 days ago
$333
Roundtrip
found 2 days ago
Select United flight, departing Tue, Nov 10 from Newark Liberty Intl. Airport to Lambert-St. Louis Intl., returning Thu, Nov 12, priced at $333 found 2 days ago