Cheap flights from Baltimore to Peterborough from CA $321

View CA $321 flight on Wed, Sep. 3, 2025Opens in a new window

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Cheap flights from Baltimore (WAS) to Peterborough (LHR)

Prices were available within the past 7 days and start at CA $321 for one-way flights and CA $705 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Sep. 1 - Wed, Sep. 10
DCA
Washington
LHR
London
CA $705 Roundtrip, found 4 days ago
CA $705
Roundtrip
found 4 days ago
Select United flight, departing Mon, Sep. 1 from Washington to London, returning Wed, Sep. 10, priced at CA $705 found 4 days ago
American Airlines
Mon, Sep. 1 - Wed, Sep. 10
DCA
Washington
LHR
London
CA $712 Roundtrip, found 4 days ago
CA $712
Roundtrip
found 4 days ago
Select American Airlines flight, departing Mon, Sep. 1 from Washington to London, returning Wed, Sep. 10, priced at CA $712 found 4 days ago
Delta
Sat, Aug. 9 - Tue, Aug. 19
BWI
Baltimore
LHR
London
CA $712 Roundtrip, found 4 days ago
CA $712
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Aug. 9 from Baltimore to London, returning Tue, Aug. 19, priced at CA $712 found 4 days ago
Delta
Mon, Sep. 1 - Wed, Sep. 10
DCA
Washington
LHR
London
CA $712 Roundtrip, found 4 days ago
CA $712
Roundtrip
found 4 days ago
Select Delta flight, departing Mon, Sep. 1 from Washington to London, returning Wed, Sep. 10, priced at CA $712 found 4 days ago
Virgin Atlantic
Mon, Aug. 18 - Thu, Aug. 28
DCA
Washington
LHR
London
CA $716 Roundtrip, found 11 hours ago
CA $716
Roundtrip
found 11 hours ago
Select Virgin Atlantic flight, departing Mon, Aug. 18 from Washington to London, returning Thu, Aug. 28, priced at CA $716 found 11 hours ago
Icelandair
Wed, Nov. 26 - Sun, Nov. 30
BWI
Baltimore
LHR
London
CA $758 Roundtrip, found 4 days ago
CA $758
Roundtrip
found 4 days ago
Select Icelandair flight, departing Wed, Nov. 26 from Baltimore to London, returning Sun, Nov. 30, priced at CA $758 found 4 days ago

Find the cheapest month to fly from Baltimore (BWI) to London (LHR)

February is typically the cheapest month to fly

From CA $692 - CA $1,284 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.